The Ultimate Guide to Conservatory Roof Replacements

For the past ten years, Roofworx Southwest have been installing the best conservatory roof replacements for our customers. We take out their old conservatory glass roof panels or polycarbonate roofing and install brand new, energy efficient, lightweight solid roofing designed specifically for conservatories and similar home extensions.

These kinds of conservatory roof replacements are very popular right now, for three main reasons:


  • They are affordable
  • They save money on energy bills, and
  • They sort out the main issue with traditional polycarbonate or glass conservatory roofs: temperature regulation. 


In a nutshell, most old conservatories (and many newer ones!) are too hot in the summer and too cold in the winter. Other common issues include noise, mould, roof leaking and condensation. All of these lifestyle issues impact on you and your family’s enjoyment of your conservatory space.


If your conservatory or orangery is uninhabitable for many months of the year, replacing the roof can make all the difference. You will, in effect, be adding an extra room to your house.

So what are your conservatory roof options? 

  • Replacing like for like

    Some homeowners are convinced that their poorly performing or leaking  conservatory roof is due to its age and the inevitable wearing away of sealant, etc. over the years. They note that polycarbonate is still very cheap - probably one of the lowest cost options  - and they pay for an installer they trust to fit a new one for somewhere between £2,000 and £7,000 (depending on whether they have a small lean-to or something more extensive, like a Georgian or Edwardian conservatory). We go into more detail below on why this is a classic example of false economy.


    Fixing new polycarbonate panels in place is easy, so it  should take a competent installer only two to three days (but remember to allow time for manufacture and delivery of the materials which can take one or two months).

  • Glazing

    While single pane glass roofing is worse still - and can easily get broken - some homeowners see how well their double glazing performs throughout the house and logically conclude that a classic double glazed roof would do the same for their conservatory. So, what are the pros and cons of glass roof conservatory solutions? 


    Double glazed panels cost more than polycarbonate (about four times more) but are stronger, more durable and provide more options for styling your roof. A glass roof is, of course, clear rather than slightly opaque so will sparkle nicely in the sunshine (especially with the added sheen of silver aluminium frames) and (unsurprisingly) admits more light than any other material. This provides a satisfying sense of space and can connect your conservatory to the garden.


    One of the options worth considering is low-emissivity glass (sometimes called ‘e-glass’ or ‘low E glass’). This is coated with a thin layer of silver (or an alternative material) that reflects long wave (infra-red) energy. This increases the efficiency of the glass. Other performance enhancing options you can pay for include:


    • Self-cleaning ‘solar-control’ glass. Self-cleaning glass includes a chemical, usually titania (titanium dioxide), that both disperses raindrops (through hydrophilic action) and reacts with UV light to break down dirt. Solar control glass can also block over 80% of the sun’s UV rays.
    • Tinted or anti-glare glass. Tinted and anti-glare glass panes, as you might expect, reduce the glare of the sun, helping to protect furniture and sensitive surfaces from UV light damage, which will otherwise cause fading over time.
    • Acoustic glass. This will deliver enhanced soundproofing.
    • Obscured glass. For privacy and reduced glare.
    • Toughened glass. For maximum security and impact protection.

    For a budget-friendly alternative, you could consider applying glass films to your glazing. The cost of having a new glass conservatory roof installed varies a lot and higher spec designs can be very expensive. Glass panels and fittings are heavier than polycarbonate alternatives making them harder to transport and manipulate. This increases material and labour costs. Incorporating enhanced glass panes, like those listed above, can add an extra 25% to your costs.


    If you are set on a glass conservatory roof, it is important to invest in quality glazing and to hire an experienced and professional installation company. This will avoid issues such as misting between glass panes.


    Whatever options you decide on, a new double or triple glazed conservatory roof would certainly be an improvement on old glazing and polycarbonate, especially if your conservatory is mainly used as a greenhouse for plants. But glass roofing is often not the ideal solution homeowners were after.

  • Hybrid designs

    Some companies have developed bespoke concrete and glass or composite and glass hybrid roofing systems which combine glazed and solid panels. These are very popular but some designs can be a bit ugly and the quality (and price) varies wildly.


    Some companies even offer a very fast ‘ship-lap’ service whereby they cover the inside of some of your existing glass panels with a uPVC or plastered lining, creating a hybrid conservatory roof. Of course, this option won’t do much to compensate for inefficient glazing or polycarbonate sheets. Without sufficient ventilation, condensation can also build up within the lining, particularly if the installation is poorly executed. You will also need to thoroughly inspect the roof for leaks beforehand to avoid the new lining becoming damaged in wet weather.

  • Traditional solid conservatory roofs

    Since 2010, the old building regulation stipulating conservatory roofs had to be at least three-quarters translucent was done away with. 


    While modern triple-glazed conservatory roofs are the most thermally efficient option for a glazed or hybrid roof, a solid conservatory roof is even better, because it offers homeowners the benefit of integrated insulation. Solid conservatory roofs are also more durable than polycarbonate or glass roofs, whatever the tiles you choose (see below for more on tile options).


    One thing that might be turning you off from thinking about solid roof replacements is the assumption that you will lose significant amounts of light. In fact, if you are smart with your choice of ceiling paint, you will notice hardly any difference in lighting levels. Roofworx Southwest use anti-reflex paint which provides a bright, even finish to your ceilings. If you really must have natural light, you can choose a solid conservatory roof with skylights, although this will reduce thermal efficiency as heat inevitably escapes faster through glass than a solid roof. 


    Whatever you decide, solid conservatory roof replacements do offer the best solution for homeowners who want to make full use of their conservatory on a daily basis.


    There are different types of conservatory roof materials available which will affect the roof’s properties and make a big difference in terms of performance, weight and cost. Some examples of common materials for solid conservatory warm roof tiles are:


    • Concrete
    • Natural slate
    • Synthetic slate (e.g. Tapco tiles)
    • Clay
    • Glass-reinforced plastic (GRP)
    • Steel
    • Composite or ‘sandwich roof panels’

    Unlike polycarbonate or glazing, you have a lot of options when it comes to detailing tiles so you can more easily ensure your new conservatory roof is in keeping with the surrounding area while matching your conservatory  windows. If you wish, you should be able to easily get hold of conservatory roof tiles that are a similar material, colour and style as your existing roof tiles, really integrating your conservatory into the design of your home. Alternatively, you can choose to make a statement by reflecting your personal style in the design of your conservatory. 


    Natural slates are classy and will give a stylish look to your conservatory while synthetic slates are long-lasting, lightweight and can look pretty authentic.


    Sandwich roof panels wrap a hard skin (e.g. GRP or metal) around an insulating core (e.g. polyurethane, mineral wool, expanded polystyrene, etc.). They tend to be light, energy efficient and available in a wide range of colours.


    If you go down the solid roof route, one major factor you have to consider is weight. For example, some concrete roof tiles are seven times heavier than a standard shingle. It is important to carry out a survey prior to any work because you don’t want a roof that is too heavy for the existing structure of the conservatory. Concrete tiles are a common culprit when it comes to conservatory collapse because they absorb water over time, making your conservatory roof even heavier. Heavy roofs can also complicate a conservatory roof replacement project in terms of getting it signed off by building regulations (there is a lot more on building regulations and planning permission later in this guide). Many installers simply won’t consider using concrete tiles, especially if your conservatory was built in the early Noughties (or before).


    Caution: A conservatory specialist may offer a free survey, only to tell you that your existing structure is not good enough to support a solid roof, and you will need a whole new conservatory. Get a second expert opinion, ideally from someone without a vested interest. It is often perfectly possible to strengthen the existing structure so that it can take a solid roof.


    Budget is no doubt a key factor in your decision and these types of standard solid roofs are costly, partly due to the framework and supports (e.g. extra battens and rafters) your installer will need to put in to cope with the weight. This also adds time to the process so if you’re paying for labour by the hour, this is something to cost in. Expect to pay anywhere from £10,000 to £35,000 for this type of solid conservatory roof replacement*. 


    *You might see lower costs advertised online but that is often a very stripped down estimate set purposefully low to persuade you to enter your details for a quote (and to get you on to a marketing list). This article is provided purely for your information and I have tried to be as realistic as possible with prices.

  • Modern solid conservatory roof systems

    So, how about one of the newer tiled conservatory roof systems? For a start, in terms of total conservatory roof replacement cost UK homeowners can expect to pay a lot less than for a traditional solid roof.


    How much are we talking? There is no standard figure, because costs will depend on the size (area) of your conservatory and your choice of tile material.


    Style (e.g. lean-to, Victorian, Edwardian, Gable End, etc.) is also a key factor. More complex styles will need more panels and a greater variety of panel profiles. There will also be more labour needed to fit these properly.


    Even then, you won’t find a standard price that fits all situations, because each installation company has their own quoting basis. For example, some companies will base their prices on the area of your conservatory, in square metres. Others on how long they think the installation will take. 


    Factors, such as the number of windows and your conservatory’s age and height may also have a bearing.


    How much does Roofworx Southwest charge for a conservatory roof replacement? 


    As a rough guide, an average Roofworx Southwest roof system might cost you between £5,000 and £10,000, depending on the size of your conservatory and dozens of other factors. However, some of our larger projects have come in at over £20,000 so there is a lot of variation. We’re based in the south west so you might find that conservatory roof prices are higher or lower if you are based outside of this area.


    As a rule, Roofworx Southwest quotes tend to come in 50% under those of Greenspace and 25% under CosyRoof but again, this will vary with each unique project. Although we like to be competitive on price (and guarantee to be 20% cheaper than rival companies) our focus is mainly on providing you with the best service possible. For example, we always use 150mm insulation whereas some other firms save money by using the thinner 100mm. We also put in working spotlights and completely tidy up behind ourselves. This will only take us a few days, so the customer could literally go away for a week and come back to a smart-looking, well-insulated new room.


    Modern solid conservatory roof systems can be quickly installed, with much of it usually prefabricated off site.


    So, that’s conservatory roof replacements in a nutshell. If you are based in the south west or south of the UK, please call Roofworx Southwest on 0800 246 5618 for a free, no obligation quotation.


    If you are hungry for more information, read on!


    In this guide, we have tried to think of all the questions a homeowner might ask before making their decision. Hopefully we’ve covered anything but please let us know if anything’s missing and we’ll be sure to add it in.


    This guide covers:


    • Insulation, U-values and why a new polycarbonate roof is not the answer to a poor-performing conservatory
    • More detail on the benefits of solid roof replacements (beyond temperature control and cost)
    • Whether pitched or flat roofs are better for conservatories
    • What to do about roofing lean-to conservatories and other non-standard extensions
    • How to find a local installer you can trust
    • Building regs and planning permission
    • The pros and cons of DIY conservatory roof replacement
    • Grants and financial support for conservatory roof replacement

Why a replacement polycarbonate conservatory roof is not the answer

Polycarbonate was one of the most popular conservatory roofing options up until around 2011. It is a thermoplastic which means it can be easily moulded when heated up. Once it hardens, it maintains its new shape with no loss in strength. 


Polycarbonate is excellent at blocking ultraviolet light too, keeping out rays from both the UV-A and UV-B frequency range (ordinary clear glass only really blocks UV-B). This is one of the reasons polycarbonate is popular for shop awnings, where stock needs to be protected from fading.


Polycarbonate sheets are cheap and can be stacked to form a multi-layer roof with an air gap in between. Although this structure is commonly called ‘twin wall’, some polycarbonate conservatory roofs have up to five layers.


Polycarbonate is lightweight, so can be easily manipulated and carried. As a result, replacing an old polycarbonate conservatory roof with a newer one can be carried out quite quickly (probably in around two to three days although something like a double-hipped roof will clearly take longer to replace than a flat roof).


The lower material and labour costs of installing a polycarbonate roof is obviously a major draw for homeowners on a budget.


So far, so good, right? But the main problem with polycarbonate - and it is a big one - is that it is an awful insulator. True, it beats a single pane of glass (and even old-school double glazing) but it still allows heat to enter and escape far too easily. Even the modern polycarbonate roofs with uPVC framing, which do perform better and last longer than older models, are likely to disappoint in terms of energy efficiency.

Boiling in the summer; freezing in the winter

Polycarbonate conservatory owners know the results. In winter, any heat gets sucked straight outside, leaving the room feeling like an Arctic island and suitable only for eskimos and penguins. Condensation is also a common problem in the cooler months and this can lead to problems with mouldy furniture and associated smells. Not a pleasant or healthy situation for family members and a big put off for visitors and even potential buyers!


The situation in summer is a bit more complicated. Direct sunlight comes straight through the polycarbonate roof but loses energy on the way through. It heats up the air inside before slowly escaping. Since the air heats up faster than it can dissipate, the atmosphere soon becomes oppressive: unbearably hot and stuffy. Scientists call this the ‘Greenhouse Effect’ and if you plan on growing tomatoes in your conservatory, you might be fine with that. For most of us, it means the conservatory is a no-go area in the midst of summer.


So, we are basically left with an indoor space that is not very comfortable to stay in and useless for anything except a bit of basic storage for most of the year.

The science of heat transfer

When it comes to comparing the ability of materials to conduct heat, we look at their U-values. But don’t worry, we don’t need to get too technical. All we need to know is that the higher the U-value, the more easily heat will escape through a surface made from that material - like a conservatory roof, for example.


As the graphic below shows, modern replacement conservatory roof panels provide a much better insulated conservatory than traditional polycarbonate roof panels. No matter how thick your polycarbonate roof is, you will never achieve a U-value of less than 1.0. Modern solid conservatory roofs with their cosy roof tiles (cosy roof panels) are also better at retaining heat than any type of glazing - even e-glass and modern 23mm upvc triple glazing sealed units with argon gas between the panes. These might give you a U-value of just under 1.0 If you are set on flooding your conservatory with as much light as possible.. However, many homeowners are more than happy with one or two roof windows set within a solid roof providing a U-value of less than 0.5. Having said that, even roof windows heavily reduce the thermal efficiency of your roof, which is why Roofworx Southwest recommend a completely solid roof with a ceiling coated with anti-reflex paint. Our customers often tell us that this paint is so effective that they have noticed no difference in light levels whatsoever.

how much heat does your conservatory roof lose?

U-values for common conservatory roofing materials and roof replacement systems

Most conservatory roof replacement systems feature lightweight roof panels or tiles with polyurethane (PUR) or polyisocyanurate (PIR) roof insulation included in their design. This creates a ‘warm roof’ system (similar to a warm loft) that retains heat and ensures that the room below is habitable whatever the conditions outside. 


Point of interest: PUR and PIR insulation are both rigid, polyurethane-based foams with high water resistance to boot. PUR was discovered by accident in 1954 when water was added to polyurethane. PIR has similar properties but is more fire resistant than PUR.


Of course, you could add heating or air conditioning to your polycarbonate-roofed conservatory but then you would need to balance the lower replacement polycarbonate conservatory roof cost with the extra money you will be spending day in, day out in extra heating and/or electricity. Even if you are advanced enough to have a smart home heating system, the long-term drain on your energy bills will eventually outweigh the extra money you could have spent on a decent conservatory roof replacement material. Besides, when you compare the cost of an average quality polycarbonate roof with a mid-range solid roof system, you might be surprised that there’s not a lot on it.


The cost gap is likely to shrink further as time goes on and the cost of oil (from which plastic is derived) increases due to either supply issues or green taxes on oil companies.


Cost isn’t the only factor either. Extending heating systems into a conservatory can also complicate things when it comes to building regs (see the section on planning permission and building regulations below).


Another problem with polycarbonate panels is that they don’t provide sound-proofing. Even a moderate shower can cause a right racket.

It’s not just about the panels

Finally, although good quality polycarbonate can last for up to 20 years, homeowners also need to think about the other parts of the roof. Any damage will eventually worsen and affect the integrity of your whole conservatory, and possibly the rest of your home too. So, we recommend acting sooner rather than later if damage is evident. 


Sometimes, you may not see any damage but start to notice that there’s a draft that wasn’t there before, or your conservatory is noticeably colder. These are all red flags which you shouldn’t ignore.


So, what damage can occur with polycarbonate panel conservatory roofs?


Shoddy installation; warping or cracking of the surrounding conservatory framework or glazing bars (often due to natural ground movement over time); scratches, dents and perforations from winter hailstorms; degraded sealant, etc., not only makes your conservatory (and by association, your home), look horrible but will shorten the lifespan of your polycarbonate roof. Or at least have you (or a builder) up a ladder every few years sorting out leaks, drafts and other problems caused by weathered joints, etc.


Polycarbonate sheets may be super strong in themselves - but that’s no consolation if they’re lying scattered across the lawn following a winter storm!


If you want an analogy, think of a set of teeth. You need to look after your gums as well as your teeth because there is no point having teeth that last forever if they end up falling out!


You can pay extra for more robust frames, replacing uPVC with aluminium, brick or timber for instance.


Aluminium is lightweight, long-lasting and can be recycled afterwards. It can also support large expanses of glass making for pleasant sightlines. 


Timber frames are attractive, durable, insulating and available in soft wood (like larch or Douglas fir) or hardwood (like oak). 


However, upgrading your frames will push the costs up and you will still need to be hot on maintenance to avoid structural damage a few years down the line. For example, once timber frames have rotted, there is little option but to replace the entire roof.


A modern, lightweight conservatory roof replacement can last 50 years or more, partly due to the integrated design that vastly reduces damage from the elements. Choosing this option will also enhance your home’s kerb appeal and will be more cost-effective in the long run than replacing like with like.

More benefits of solid conservatory roof replacements 

We began this guide by focusing on the role of modern conservatory roof replacements in regulating the temperature of your conservatory. But there are many more advantages you can enjoy when your new roof is in place.

  • Save energy and help the planet (by cutting costs and reducing your carbon footprint)

    This is a benefit that is often promoted whenever you add roof insulation panels to your home, but how does this work in practice?


    Have you been using heaters or air conditioning to regulate the temperature of your conservatory? If you have a warmer, better ventilated space, following a conservatory roof replacement, it is easy to understand how you can save money. You simply won’t have to turn the heating - or the aircon - on as often.


    But what if you don’t use heaters or air conditioning in your conservatory? Well, you still could be losing  heat if your conservatory isn’t thermally separated from your home. You could be transferring a lot of heat out of your home through your conservatory. You can test this by pressing your hand against any walls, doors and windows that connect the two buildings. Do they feel cold to the touch? The colder they feel, the more heat is being sucked through into your conservatory. If your heating system is thermostat-controlled, you will find your burner firing more often. If you manually turn the heating on and off, you will probably find you are boosting the temperature more often.


    Either way, you are paying, directly or indirectly, for the poor performance of your existing conservatory roof.


    How much money will you save by replacing your existing conservatory roof with a modern solid replacement? This will depend on various factors, including:


    • The thermal efficiency of your existing conservatory roof
    • The specific roofing system you decide to install
    • The quality of the installation
    • How often you heat (or artificially ventilate) your conservatory
    • How well your home is thermally separated from the conservatory
    • Your energy tariff

    Referencing an independent AECOM study, Roofing Megastore Ltd., claim that homeowners, ‘could save up to £200 on utility bills’. This figure was also given by the Eco Experts.


    There is a caveat. If your conservatory is totally thermally separated from your home, and you currently never use it, converting it into a liveable space may increase the energy you use. However, any heating you do put on will operate more efficiently due to your insulated roof.


    As everyone now knows, the less gas or electricity you use, the less carbon dioxide is released into the atmosphere. One conservatory roof replacement might not make much of a positive impact, but you will also be part of a growing movement towards more eco-efficient properties. 

  • Use your conservatory all year round

    Do you dream about having your breakfast, lunch and evening meal while looking out at the garden? With a solid conservatory roof, you can do this in the height of summer, the depths of winter and every day in between. Some customers have taken temperature readings during the summer, and they are reporting that their conservatories are one to two degrees cooler than the adjoining rooms.  

  • Reduced noise and glare

     A conservatory with a tiled roof not only makes it much cheaper and easier to regulate temperature, it also reduces noise when compared with polycarbonate or single glazed roofs. From barking dogs to lawnmowers to torrential showers, a properly fitted solid conservatory roof will form a soundproof barrier. Whether you are using your conservatory as a study space, a TV room or simply somewhere to chill out, you can avoid annoying noises. 


    Do you enjoy the sound of pattering rain? Choose one or two roof windows and simply open them a little when the showers start. At least you will have the choice whether to let the outside in or not. You will also avoid problems due to excessive glare which can render work or study impossible.

  • Increased style and versatility

    These factors combined gives a homeowner a lot of options. Do you need an extra bedroom or living room? An office adapted to your new WFH (work from home) lifestyle? A classy dining space? A studio for a budding young artist? A mini gym? Anything’s possible, and having multifunctional rooms can add even more value to your home.


    Working from home? Roofworx Southwest can install all the power points and USB ports you need in your new, comfortable and practical office space.


    Solid roof systems also provide many more design options to the homeowner. This includes both exterior and interior design elements. 


    Starting with the tiles themselves, there is a lot of variety to choose from which means you can ensure the design is perfectly matched with the rest of your home. Alternatively, you can choose a contrasting colour and/or texture to stand out and showcase your unique style. Although polycarbonate roof panels do come in different colours (e.g. opal and bronze), there is a much limited range, especially within a reasonable budget. 


    If you want to hide guttering and ridges, you will find many different types of cornice and ridge caps on the market.


    Now let’s turn to the interior. With a solid roof, you also benefit from a plastered and painted ceiling along with your choice of lighting (traditional lamps, spotlights, mood lighting, etc.), and even speakers. With a traditional conservatory, it is more challenging to create a light space for night time use, so not only are you using your conservatory for only half of the year, you are also restricted to daylight hours even then. Roofworx Southwest install dimmable lighting, giving you even more control over your lighting set-up.


    If you have a high ceiling, as commonly seen with Victorian, Georgian, Edwardian, Pavilion or Gable styles, you can opt for a vaulted ceiling which follows the roofline and will maximise the space above. If you want to retain some natural light, a translucent or tinted roof window or two (aka rooflights) can easily be included. Think about where you want to position them in relation to the path of the sun over your property (both throughout the day and the year). 


    Can you see now how a lightweight roof system actually turns a conservatory into a fully functioning, integrated room?

  • Maintenance and durability

    Let’s move on to maintenance and durability. Most good quality conservatory roof replacements are designed to be really easy to maintain which is a huge benefit, especially for older homeowners. The integrated design helps to keep out the elements, the structure does not need re-painting or varnishing and the tiles themselves are easy to clean (often needing just an occasional washdown and brushing off the leaves in the autumn). Climbing ladders with buckets of cleaning chemicals is not a pleasant task at any age, but maintenance-free and low-maintenance conservatory roofs are particularly important for the elderly, infirm or disabled homeowner. 


    Solid roof systems also last longer overall with a lifespan of 50 years or more. There is some variability with cement not nearly as durable as clay, slate or composite materials, which can last up to twice as long. However, any correctly installed solid roof will outlast polycarbonate or glass roofs which tend to need replacing every 15 to 20 years or so (some only last around 10 years)


    And don’t forget the room’s contents. It is rarely mentioned that the fluctuations in temperature in a polycarbonate roofed conservatory can increase wear and tear in furniture and appliances. Some contents (e.g. sensitive electrical items) can become seriously damaged by being plunged into cold temperatures or roasted in the sunlight. A solid conservatory roof will give as much protection to your valuable contents as any other room in your home.


    Whatever choice you make, get your installation backed up with a written guarantee. Roofworx Southwest roofs automatically come with a 10 year guarantee. We also recommend a ‘supply and fit’ arrangement so that you only have one point of contact if you experience any problems. 


    Modern solid conservatory roof systems are integrated, making them much more resilient to the elements and the action of plants and animals. We all know how wind and water can gain a foothold in a building’s nooks and crannies, gradually eroding the structure. It is much harder for the weather - and natural organisms - to find a way into an integrated system making modern solid conservatory roofs extremely durable.

  • Improved air quality

    An integrated system also provides more of a barrier to microorganisms (e.g. bacteria, mould spores, viruses), insects, pollen and other airborne intruders that can spread disease, affect air quality or generally cause a nuisance.


    Modern building methods and materials also means that a new conservatory space or extension will enjoy better ventilation than in the past, helping ensure a pleasant experience all year round.

  • Uplift on your property value

    Converting your conservatory into a habitable space will also add value to your home. How much value? Well, according to the Eco Experts, conservatory renewal will push up your property value by 7%. What does that mean in real money terms? For example, if your home is currently worth £250,000, that would mean a new value of £267,500 - an uplift of £17,500!


    So, if you are considering making a move, getting a conservatory roof replacement could be one of the savviest investments you ever make. Even the modern look and feel of a new replacement roof gives off good vibes which can complement your home and help secure a sale.


    Above everything, you need to look at how your current conservatory makes you and the rest of the family feel. Many of us have spent longer at home than we are used to due to the pandemic and have realised how the atmosphere of each room affects us. If your conservatory is making you feel unhappy and uncomfortable or you are anxious about the energy you are wasting, consider biting the bullet and making the change.

Planning permission and building regs when replacing conservatory roof with solid roof 

This is one of the areas that we are often asked about so it deserves its own section. We will do our best to keep this section updated as rules and regulations are subject to change.


In 2022, you will not usually need planning permission to add a replacement roof to an existing conservatory. Planning permission is the local government mechanism by which the development of the local area is controlled. Changing your conservatory roof comes under permitted development rights. However, if you are lucky enough to live within a Conservation Area, National Park, World Heritage Site, Area of Outstanding Natural Beauty or Broad, you may find that the Local Authority has restricted residents’ permitted development rights using an Article 4 direction). Permitted development rights also do not apply to listed buildings. It is always best to check with your local planning office if you are in any doubt, and they can even issue you with a Lawful Development Certificate, if you really want to dot the is and cross the ts.


Building regulations are a bit more complicated as they cover health and safety, wellbeing, energy efficiency and sustainability. What’s more, new energy conservation guidelines came into force in June 2022, partly to help simplify things, so any advice you may have received before could now be outdated.


Very few conservatories are exempt from building regulations. Those that are, must meet the following criteria:


  • They are built at ground level and are less than 30 square metres in floor area.
  • The conservatory is separated from the house by external quality walls, doors or windows.
  • There should be an independent heating system with separate temperature and on/off controls.
  • Glazing and any fixed electrical installations comply with the applicable building regulations requirements (see below).
  • The conservatory is single storey.


In every other case, despite what anyone else tells you, installing a solid conservatory roof is covered under building regs, and the work will need to be signed off by a building inspector who will issue a ‘completion certificate’ when they are satisfied that your structure is safe, habitable and energy efficient (as measured by a SAP test). Roofworx Southwest customers don’t have to worry about any of the red tape though. We take care of the entire building regulations process and arrange for the completion certificate to be sent directly to the customer’s preferred email address.


What’s in the new energy guidelines (Approved Document L)?


The new energy guidelines (Approved Document L) that came into force in June, spells out the following:


A conservatory or porch must have thermal separation from the existing dwelling. If the thermal separation is removed or the dwelling’s heating system is extended into the conservatory or porch, the conservatory or porch should be treated as an extension.


What that means in practice, is that unless your ‘conservatory’ is separated from your home by a wall or an external quality door, it is deemed an extension, and the thermal efficiency of the whole room must be taken into account when carrying out any work on it - including roof replacement.


Building Inspector surveyors will also check your plans to make sure that the underlying structure has the load bearing capacity to safely take a new solid roof. In some cases, they might require you to replace doors and windows before adding a new roof so be prepared.


Lightweight solid roof systems consist of either moulded resin sheets, styled to look like separate tiles, or composite slates. They can often be installed with minimal, if any, reinforcement as their weight is similar to a double or triple glazed roof.


In fact, our roofing system weighs 0.6kg/m2, lighter than your average glass roof system.


Any conservatory roof replacements will still require Building Regulation approval though because the insulation and ceiling finish all add weight. However, some companies may have partnered with building control bodies to help streamline the process either through pre-approval of their designs and processes or (as in the case of Roofworx Southwest) by managing the inspections on your behalf.


‘Traditional’ solid roof replacements and weight considerations


If you are considering an older style solid roof replacement, you may need to replace your windows or even the entire base of your conservatory. Alternatively, you could carry out some reinforcement work. Either way, this will add to the time and cost of the project. A surveyor may need to carry out tests to assess the strength and composition of your existing windows. For example, are your PVCu windows reinforced with a steel core? This can be checked by drilling discreet pilot holes or using a magnetic test.


You might need to replace thin glazing beads with stronger I-shaped profiles with wide top flanges. Alternatively, you could choose to install timber rafters alongside the existing beads but you must make sure these are braced and fixed in place or you could find that the wood twists and warps as it dries. The timbers will also need support at the end bearings.


Things get even more complicated if your conservatory walls are made entirely from unsupported glass panels. To transfer the weight of a heavy solid roof into the fundations, you will need to build a lintel and post system at the eaves. In fact, this is how traditional garden rooms and sunrooms were built with the corner posts taking the weight of the roof rather than the conservatory glass.


The Building Regulations process


If your installer doesn’t take care of Building Regulations on your behalf, you will need to submit what’s called a ‘building control application’. This may be called a ‘Building Notice Application’ or something similar, depending on your local authority. Since the pandemic, many local authorities are only taking digital applications and making alternative arrangements for site inspections. 


You can find details of your local building control body by contacting your local authority or visiting their website.


As Roofworx Southwest are based in Devon, we have provided some specific details for local authorities in this area. Check the ‘last updated’ date underneath as regulations and processes may have changed since we published this. Please let us know if you come across any broken links.


Dartmoor National Park Authority


The Devon Building Control partnership is responsible for building regs applications in Dartmoor National Park, the South Hams, Teignbridge and West Devon areas. For commercial or domestic applications, go to https://www.devonbuildingcontrol.gov.uk/professionals/make-an-application/ 


East Devon District Council


Full plans applications and building notices can be submitted online at https://eastdevon.gov.uk/building-control/


Exeter City Council


Building regulation applications can be made online. Go to https://exeter.gov.uk/planning-services/building-control/building-regulation-approval/ 


Mid Devon District Council


Building regulation applications are handled under a joint scheme with North Devon District Council (nmd). Go to https://www.nmdbuildingcontrol.co.uk/ to apply online.


North Devon District Council


Building regulation applications are handled under a joint scheme with North Devon District Council (nmd). Go to https://www.nmdbuildingcontrol.co.uk/ to apply online.


Plymouth City Council


For links to building regs applications, go to https://www.plymouth.gov.uk/planningandbuildingcontrol/buildingcontrol


South Hams District Council


The Devon Building Control partnership is responsible for building regs applications in Dartmoor National Park, the South Hams, Teignbridge and West Devon areas. For commercial or domestic applications, go to https://www.devonbuildingcontrol.gov.uk/professionals/make-an-application/ 


Teignbridge District Council


The Devon Building Control partnership is responsible for building regs applications in Dartmoor National Park, the South Hams, Teignbridge and West Devon areas. For commercial or domestic applications, go to https://www.devonbuildingcontrol.gov.uk/professionals/make-an-application/ 


Torbay Council


Torbay Council accept both telephone and online applications. To apply by phone, call 01803 208095. For links to the online application forms, go to https://www.torbay.gov.uk/planning-and-building/building-control/ 


Torridge District Council


Torridge District Council directs applicants to the Planning Portal, a joint venture between TerraQuest Solutions Limited and the Ministry of Housing, Communities & Local Government. Go to https://www.planningportal.co.uk/planning/planning-applications


West Devon Borough Council


The Devon Building Control partnership is responsible for building regs applications in Dartmoor National Park, the South Hams, Teignbridge and West Devon areas. For commercial or domestic applications, go to https://www.devonbuildingcontrol.gov.uk/professionals/make-an-application/ 


Last updated: 3rd October 2023


Make sure you ask your chosen installer about building regs and how they are going to manage that side of things. The last thing you need is for the council to turn up and take you to court for contravening building regulations. There is no limit to the fine they can impose and they can prosecute you up to two years after the work has been completed.


For more specific guidance on planning permission and building regulations, visit the Planning Portal, a joint venture created by the government’s Department for Levelling Up, Housing and Communities and TerraQuest Ltd.

Does it matter if I have a pitched or a flat roof?

No. There are plenty of companies offering conservatory roof replacements that can cater for almost any type of roof. Whether your conservatory is P, T, L or U-shaped, it will be possible to replace the roofing.


If you are the proud owner of a large Edwardian or Victorian style conservatory, chances are you will have a ridged, pitched roof and will need corresponding pitched roof panels or tiles to maintain the aesthetic. 


Beyond style, pitched roofs can channel rain quickly away from the structure and create more internal space.


If your conservatory is actually more akin to an orangery (i.e. a brick structure with large windows and a flat roof), you could maintain that style by replacing the current roof with a solid replacement. Orangeries, which originate from 17th Century Italy, were originally designed to house tropical plants and, as the name suggests, fruit. They were associated with wealth and status and traditional designs often included roof lanterns for extra light. This is well worth considering as explained earlier. Roof lanterns can be installed on flat or mansard roofs.


The most common type of conservatory is a lean-to (or dwarf wall) conservatory. This is where a flat, pitched roof slopes down from the wall of the main house to a smaller wall outside. A basic lean-to conservatory roof replacement will also likely only involve replacing the existing roof with a like-for-like flat roof. The design of your house might constrain your choice of roof shape, although there is almost always a way around such obstacles.


Of course, no roof is ever completely flat because rain water does need to run off somewhere. If you do opt for a flat roof design, it is important to use an experienced installer who can advise you on the best materials and minimum pitch for the roof. Otherwise, leaks could become an issue.

What style of conservatory do I have?

If you’re unsure what style your conservatory comes under, here is a brief guide:

Lean-To, Sunroom, Low Profile or Mediterranean style:


There are lots of different names given to this style of conservatory. It is characterised by a flat, sloping roof which makes it convenient for fitting to homes where a period style conservatory would be tricky. Bungalows and properties with low eaves often have lean-to conservatories attached to them. The simple, clean lines of a lean-to conservatory also makes it a popular choice for modern buildings.


Georgian style:


The most ‘retro’ of the three period style conservatories, the Georgian conservatory is characterised by a simple, symmetrical base (square or rectangular) with ornate detailing, such as fancy ridges. In keeping with the Georgian style, the design will be inspired by classical Greek and Roman architecture, with proportions often based on the Golden Mean. Some Georgian conservatory windows include Georgian bars, internal structures which give the impression of multiple smaller panes. 


Since conservatories didn’t take off until the Victorian period, Georgian conservatories are a nod to the style rather than based on real structures of the time.


Victorian style:


The 1800s saw an explosion in conservatories driven by advances in sheet glass production. Victorian conservatories are characterised by ornate pitched roofs and a three or five faceted front, giving them a rounded appearance. Victorian conservatories (or sun-rooms) often have a brick base, although some include full glass sides.


Edwardian style:


The Edwardian era (1901-1919) saw a return to clean lines and regular shapes, focusing on maximising light and space, and rebelling against the fussiness of Victorian design. Edwardian conservatory roofs are often three-sided, meeting at a decorative ridge.


Gable/Gable End style:


The gable conservatory is recognisable by its vertical front panel, further increasing the available light and space. Many gable conservatories adorn the front panel with a distinctive ‘sunburst’ design. Another common feature of the gable conservatory is a short wall along one or more sides.

IP-Shaped style:


This next set of conservatory styles are combinations of those already mentioned. A P-shaped conservatory combines the lean-to and Victorian styles, with the lean-to segment often functioning as a dining room, and the faceted Victorian segment adding an attractive lounge - the curved end of the P.


L-Shaped style:


The L-shaped style is similar to the P-shaped style, but combines the lean-to and Edwardian styles.


T-Shaped style:


The T-shaped style features two lean-to sections with a larger central projection, often set above a set of wide steps. The central section may follow the Victorian, Edwardian or Gable style.


Other shaped styles: 


Rarer designs include U-shaped and B-shaped conservatories.


Orangery style:


Orangeries pre-date conservatories. The increasing availability of glass in post-Renaissance Italy, the Netherlands and other European countries led to more versatility when it came to adding windows to buildings. Orangeries became popular in northern Europe, back in the 1600s, as a way to grow plants and citrus fruit trees in cool weather (hence the name). They were also a great status symbol, as glass was still relatively exclusive. Orangeries differ from conservatories in that their main structure is based on brick or stone, and they tend to have a flat roof.. The traditional orangery had large south-facing windows, and modern versions may also have a glazed roof lantern.

How do I find quality conservatory roof replacement near me?

Many people lean towards working with established, locally based installers when having a new conservatory roof put in, but tracking down the best conservatory roof replacement companies can be tricky.


As with any home improvement or repair project, it is always advisable to get three or four free, no obligation quotes and to let each company know that is what you are doing. This will make it more likely that the installer will give you their best price and will also give you an idea of the average cost of installation in your area (which may be higher or lower than the ballpark figures I quoted earlier).


You could use a directory, comparison site or online quotation tool to save yourself time, but bear in mind that, despite claims that you will also ‘save money’, these may not get you the best price or the most skilled installers, for several reasons:


  • They may be set up by a specific company to artificially inflate their own rating. Don’t be misled by the name of the comparison site.
  • They often charge for access, so only include companies that pay to appear on them. These companies may even charge more to the customer to cover the costs of being listed on various directories.
  • Even free directories/comparison sites often exclude smaller, local firms that simply have not signed up for their directory.


Some directories will attempt to add kudos by claiming they were featured in a host of well-known national newspapers and trade magazines. Don’t take this on face value. After all, a paid ad or a negative review in those outlets could count as a ‘feature’. Be wary of discount offers too; who’s to say the firm hasn’t hiked their prices by 10% before offering that discount?


Make sure you read some conservatory roof replacement reviews and maybe visit a replace conservatory roof forum before you decide who to trust with your project. 


There are plenty of trusted local installers that have a ‘whole market’ approach, rather than being tied into a roofing system. These include Roofworx Southwest, and you can click this link to read testimonials for Roofworx Southwest installations. Testimonials and case studies provide extra valuable information that can help you make your final decision.


Others act as approved installers for well-known roofing systems including the Supalite roof system, the Guardian roof tiles system (Team Guardian) and the Ultraroof system from the Ultraframe conservatory roof company. You will find plenty of solid conservatory roof reviews online for these companies.

If you are not too worried about where the firm is based, there are also national double glazing providers, such as Anglian Windows, who offer conservatory roof replacements. Some of these will be approved installers for one or more national roofing systems while others, like Roofworx Southwest, have a ‘whole market’ approach and can pick and choose the best roofing system for your needs.


Another tip for finding the best local conservatory roof replacement firm for your needs, is to put a note through the door of properties which have recently had the work done (if you are impressed by the quality, of course). Most people would be only too happy to talk about their experiences. That way, you get a customer’s view perspective and are more likely to get a ‘warts and all’ review.


Of course, if you have friends or family in the area who have recently had their conservatory roof replaced, you can ask them directly about their experiences.


Be wary of people approaching you (even friends and family) to recommend you have your conservatory roof replaced by a specific company. Some companies operate a referral scheme which rewards the referrer with cash (which can be in the hundreds!)

Roofworx Southwest customers are delighted with their new conservatory roofs - and we’re giving them £250 to shout about it.


To show our appreciation for those satisfied customers who are sending business our way, Roofworx Southwest have launched a generous referral scheme. For every referral that ends with a roof replacement job, we give the referrer £250 cash.

What about DIY conservatory roof replacement?

If you are a practical person (or have hands-on people in your family), you might be considering getting hold of some new style or polycarbonate roof tiles and attempting to upgrade conservatory roof panels yourself. While this is certainly an option, we would recommend getting the professionals in unless you are 100% confident that you can handle the project.


Incorrect conservatory roof installation can lead to a host of problems down the line including leaks, poor thermal efficiency and ongoing maintenance work. There is also the risk of damaging the supporting structure or windows, and you alone will have to foot the bill. If you’re not careful, you could even end up damaging your main home, if there are structural connections between the two. 


Plan for success


If you do decide to go it alone, project planning is essential, especially for the more complex projects. Assuming you are opting for a modern solid conservatory roof system, you should start by researching your options. While most elements are usually prefabricated, some systems are easier to put up yourself than others. 


You will then need to fully prepare the site, prioritising health and safety; order and organise delivery of materials and make plans for ensuring your home is watertight at the end of each working day, should the weather be against you.


If you are bringing in electricians, carpenters, plumbers, plasterers, etc. you will have to time your roof replacement work around their schedules and plan in contingencies - because even with a relatively simple roof replacement, things may not go fully to plan.


With DIY conservatory roof replacement, you will also have to manage the legal side of things. We recommend contacting your local authority for specific advice about planning permission and building regulations. Without an experienced conservatory roof installer by your side, you are more likely to miss important details that could land you in hot water with the planning authorities or building control. Rather than risk having to make any costly adjustments, do everything by the book and get all plans and work signed off where possible. Again, any permissions will need to be signed off before you start work to avoid delays or disappointments.

Waste disposal is another important issue to think about. Are you able to take the old roof and other materials to your local tip or will you have to pay for a third party to clear it away? If you are planning on hiring a skip, how long will you need it for? Will you have to pay extra for a road licence?


Roofworx Southwest customers don’t have to worry about that at all because we hold a Waste Carrier Licence and take all waste away once the new conservatory roof is in place.


Finally, if you are taking on the entire roof replacement project yourself, we recommend you get at least one other person to help you with the lifting. Even lightweight roof panels and frames require careful handling, so having an extra pair of hands to support and steady them is essential.


Still up for going solo? Here are some tips for a successful DIY conservatory roof replacement:


  • Read any instructions carefully.
  • Measure everything twice (with a second person checking where possible). 
  • Unpackage and lay out your parts. Work out what goes where before making a start. 
  • Take care with orientation. Double check to make sure you are installing parts the right way up and not upside-down or back-to-front.
  • Be generous with your silicone. Coat the top of your door and window frames, and seal any gaps where windows and doors are screwed together.
  • Install and check your ridge position before adding the hips/glazing bars.
  • Chase out for your lead work before installing glazing or tiles. This will minimise the chance of cosmetic damage. Fit the lead to the walls. This can be dressed after the tiles or glass have been laid.

Could I access a conservatory roof replacement grant? 

Unfortunately, with the scrapping of the Green Homes Grant, there is currently no national government-backed scheme that is offering grants towards conservatory roof replacements. Hopefully a new scheme will come along soon.


However, if the energy crisis is making it difficult for you to keep your home warm, you may find support through your local council (try searching on their website). Although any support you get is unlikely to apply to a conservatory roof upgrade, you could set any savings you make on wall insulation, roof insulation, double glazing, etc. towards a new solid conservatory roof. 


As was the case with the Green Homes Grant, you may find that you can get local support for a conservatory roof upgrade if the conservatory is deemed part of the house (i.e. there is no separate door) and has its own heating controls. 

Be very careful with private grant schemes, as they are more likely to be clever marketing ploys or outright scams than genuine grants.


If you are unable to access a grant, the next best thing is often a finance deal, especially if you can find one with 0% interest. This will enable you to spread the cost of your new roof over a few months or years.


Many of these deals allow you to delay your regular payments for a number of months or even a year or more. You may need to pay a deposit for this privilege but there are deposit-free finance deals available. 


Always be sure to compare the APR Representative rate. It is a legal requirement for any firm offering finance to display this. The APR includes all fees in the deal to enable an accurate comparison. 

Summary

So to summarise your conservatory roof replacement options:


  • Replace polycarbonate conservatory roof with glass (double or triple glazed)
  • ​​Replace polycarbonate conservatory roof with traditional solid roof
  • ​​Replace polycarbonate conservatory roof with solid roof system, either from an independent contractor like Roofworx Southwest, with full market access, or a specific system (e.g. Guardian warm roof).
  • Replace your entire conservatory, which is almost certainly the most expensive option.

From Aberdeen to Warrington, homeowners are flocking to refresh their conservatories with modern, lightweight conservatory roof replacements. Is it time you did the same?



Contact Roofworx Southwest today on 0800 246 5618