Warm Roof Division Kent

Can I Turn My Conservatory into a Proper Extension?

Warm Roof Division — Mon, 19 Oct 2026 16:08:00 +0000

Can I Turn My Conservatory into a Proper Extension? What You Need to Consider

Most of us find ourselves needing more space in our homes at some point in our lives, but it’s often not practical or affordable to move to a bigger property. So if you have an old conservatory that rarely gets used, you may have wondered whether you could turn it into a proper extension instead.

The good news is that, in many cases, you can! However, converting a conservatory into a fully insulated room that's integrated with the rest of your home isn't necessarily as straightforward as replacing the roof and adding some insulation.

There are several things to consider, including the existing foundations, Building Regulations, planning permission and, of course, the cost.

What's the Difference Between a Conservatory and an Extension?

The main difference is how the two structures are built and how they're connected to the house.

Traditional conservatories typically have large areas of glazing and glass or polycarbonate roofs, which can make them difficult to keep at a comfortable temperature. They're also usually separated from the main house by external-quality doors.

A proper extension, on the other hand, is designed to meet the Building Regulations that apply to habitable living spaces, including requirements for insulation, structural stability and ventilation.

This means it can be integrated with the rest of your home, allowing you to create a larger kitchen, dining room, lounge or other living space without having to keep the original dividing doors.

Are My Conservatory Foundations Suitable?

Many conservatories were built on relatively shallow foundations designed to support a lightweight glazed structure, rather than the additional weight of traditional brick walls and a tiled roof.

Before converting your conservatory, the foundations will need to be assessed to establish whether they're capable of supporting the proposed structure. This may involve excavating a small trial pit to inspect their depth, width and condition.

If the existing foundations aren't suitable, they may need to be strengthened or replaced, which can add considerably to the cost.

However, lightweight modular building systems can offer an alternative to traditional brick construction, potentially allowing existing foundations to be retained where they're assessed as suitable.

Can I Keep My Existing Conservatory Dwarf Walls?

If your conservatory has low brick walls beneath the windows, it may be possible to incorporate them into the new extension.

However, conservatory dwarf walls often lack the insulation and construction details required for a habitable room. They may need to be upgraded or replaced, depending on their condition and the proposed design.

In many cases, removing the existing conservatory structure and building new insulated walls on a suitable base may be more practical than trying to adapt everything that's already there.

Do I Need Planning Permission to Replace My Conservatory with an Extension?

In England, single-storey extensions can sometimes be built under Permitted Development Rights, meaning you don't need to apply for full planning permission, provided the proposed extension meets the relevant conditions.

For example, the standard permitted development limits for single-storey rear extensions are generally:

Up to 3 metres beyond the original rear wall for terraced and semi-detached houses.
Up to 4 metres beyond the original rear wall for detached houses.
A maximum overall height of 4 metres, with additional restrictions near boundaries.

Larger rear extensions may also be possible under the prior approval process.

However, these measurements are taken from the original house, not from the back of your existing conservatory.

There are also additional restrictions for certain properties, including listed buildings, homes in conservation areas and properties where permitted development rights have been removed.

Even if you're replacing your conservatory with an extension of exactly the same size, you shouldn't assume that planning permission won't be required.

It's always worth checking with your local planning authority before starting work. You may also wish to obtain a Lawful Development Certificate to confirm that your proposed extension is permitted development.

Will My New Extension Need to Meet Building Regulations?

Yes. This is one of the most important differences between an ordinary conservatory and a proper extension.

Many existing conservatories were exempt from most Building Regulations when they were constructed, provided they met certain conditions, including being separated from the main house.

However, converting one into a habitable extension means the new structure will need to comply with the relevant requirements.

These include:

Structural stability: The foundations, walls and roof must safely support the building.
Thermal efficiency: The walls, roof, floor, windows and doors must meet the applicable insulation and energy-efficiency requirements.
Ventilation: Adequate ventilation must be provided to maintain air quality and help prevent condensation.
Fire safety: The design must meet the relevant fire safety requirements.
Drainage and electrical safety: Any new installations must comply with the applicable regulations.

Can I Remove the Doors Between My Conservatory and House?

One of the main reasons for converting a conservatory into an extension is to create an open-plan living space.

However, you can't simply remove the dividing doors from an ordinary conservatory and treat it as another room.

The doors often form part of the arrangement that allowed the conservatory to be exempt from Building Regulations. Removing them means the altered space must be assessed against the relevant requirements.

If you want to widen the opening or remove part of the external wall, structural calculations and suitable support, such as a steel beam, may also be necessary.

Can I Keep Large Windows and Glass Doors in My New Extension?

Yes, although there are limits to how much glazing can be incorporated without additional energy-efficiency calculations.

Under the usual approach to Part L of the Building Regulations, the area of windows, glazed doors and rooflights in a new extension is generally limited to 25% of its floor area, plus an allowance for any existing windows and doors that are removed or covered by the extension.

This doesn't mean you can't have larger windows, bifold doors or rooflights. It simply means that additional calculations and potentially improved insulation elsewhere may be needed to demonstrate compliance.

It's worth considering this at the design stage, particularly if you want to retain the bright, airy feel of your conservatory.

Is It Better to Convert a Conservatory or Knock It Down and Start Again?

This depends on the condition of your conservatory and what you want to achieve.

If the existing structure is sound and your main complaint is that the room is too hot or cold, replacing the roof with an insulated conservatory roof may be a more economical solution.

However, if you want to remove the dividing doors, change the layout or create a completely integrated living space, a full conversion or replacement is likely to be more appropriate.

Trying to adapt an older conservatory can sometimes prove expensive, particularly if the foundations, walls and floor all need substantial work.

Starting again also gives you greater freedom to choose the position of windows and doors, the roof design and the internal layout.

How Much Does It Cost to Turn a Conservatory into an Extension?

The cost can vary considerably depending on the size of the building, the construction method and how much of the existing structure can be reused.

The main expenses to consider include:

Removing and disposing of the existing conservatory
Any necessary foundation or groundwork improvements
New insulated walls, roofing, windows and doors
Structural work to open up the room to the main house
Heating, electrics, flooring and internal finishing
Architectural drawings, structural calculations and Building Regulations approval
Planning applications, where required

Traditional brick-built extensions can be particularly expensive if the existing conservatory foundations aren't suitable, as new foundations and extensive construction work may be needed.

A lightweight modular system may help reduce some of these costs, particularly where the existing base can be retained.

You can get an instant online quote for a modular extension without entering any contact details using our online price calculator.

Is It Easier to Convert a Conservatory Using a Modular System?

Traditionally, replacing a conservatory with a proper extension has often meant demolishing the existing structure and undertaking months of building work.

However, modern modular construction systems such as the Leka Xi offer a much quicker and less disruptive alternative.

The Leka Xi system uses lightweight, prefabricated GRP (Glass Reinforced Plastic) structural components, allowing a fully insulated extension to be constructed without the weight and extensive masonry work associated with traditional brick building.

The Leka XI system offers several advantages when replacing an existing conservatory.

Lightweight Construction – Reduces the load on existing foundations, potentially allowing the original conservatory base to be reused.
Excellent Thermal Efficiency – High-performance insulation helps keep the room comfortable all year round.
Fast Installation with Less Disruption – Prefabricated components allow the structure to be assembled in just days, rather than weeks.
More Usable Internal Space – Slimmer walls provide more internal floor space than traditional brick-and-block construction.
Flexible Designs and Finishes – A choice of layouts, roof styles and external finishes to complement your home.

Find out more about the system and its benefits on our Leka XI Modular Extensions page.

Ready to Turn Your Conservatory into a Proper Extension?

If your existing conservatory has become an unused space, replacing it with a fully insulated extension could transform the way you use your home. And with lightweight modular systems such as the Leka Xi, the process may be much quicker and less disruptive than you think.

Here at Warm Roof Division, we can help you explore the options for replacing your conservatory with a practical, attractive living space that can be enjoyed all year round.

Visit our Leka XI Modular Extensions page for more information, or to get an instant online quote.

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Thinking of Building a Granny Annexe? Everything You Need to Know

Warm Roof Division — Fri, 16 Oct 2026 09:59:07 +0000

Thinking of Building a Granny Annexe? Everything You Need to Know

Building a granny annexe can be a great way to create additional living accommodation without having to move house. But before jumping in, there are a few important things to consider.

Do you need planning permission? How much will it cost? And which type of annexe is best suited to your needs?

We've put together this guide to explain the different options available and answer the most common questions about building a granny annexe.

What Is A Granny Annexe?

A granny annexe, also known as a granny flat, granny pod, or garden annexe, is additional living accommodation within the grounds of an existing residential property. Unlike a standard garden room, a self-contained annexe is designed for someone to live in, with its own kitchen, bathroom, sleeping area and essential utilities.

Despite the name, granny annexes aren't just for elderly relatives. They can also provide independent accommodation for adult children, family members with disabilities or additional needs, or even to rent out for additional income. They can be attached to the main house, built separately in the garden or created by converting an existing garage or outbuilding.

Can I Build a Granny Annexe in My Garden?

In many cases, yes, provided you have sufficient space and can obtain the necessary permissions.

The main considerations include the size and position of the building, access for construction, proximity to neighbouring properties, ground conditions and connections to water, electricity and drainage.

It's also worth considering how much garden space will remain and how easily the occupant will be able to access the main house.

Do I Need Planning Permission?

A new, permanent, self-contained garden annexe will generally require planning permission in England.

Although many ordinary garden buildings can be constructed under permitted development rights, these rights don't generally cover the creation of separate, self-contained residential accommodation.

Your local planning authority will consider the proposed building's size, appearance, position, impact on neighbours and relationship with the existing house.

An annexe intended to remain part of the existing household may be assessed differently from a completely independent dwelling, and planning permission may include conditions restricting its future use.

An attached annexe built as an extension to the main house may have different requirements. Some extensions fall within permitted development rights, but this doesn't automatically permit the creation of a separate home.

If you're unsure, contact your local planning authority before starting work.

Do Granny Annexes Need Building Regulations Approval?

Yes. Permanent residential annexes will usually need to comply with Building Regulations, which cover structural stability, fire safety, insulation, ventilation, drainage, electrical safety and other essential requirements.

Building Regulations approval is separate from planning permission, so obtaining one doesn't automatically mean you have the other.

What Different Types of Granny Annexes Are There?

Traditional brick-built Annexes

Brick-built annexes are constructed using the same methods as traditional houses, offering a solid, durable structure that can be designed to match the existing property. They provide plenty of flexibility in terms of size, layout and appearance.

However, they're often the most expensive and time-consuming option. Bespoke designs usually require architectural drawings and structural calculations, adding to the overall cost. Traditional foundations also involve substantial excavation and concrete work, while constructing the building on site can mean months of noise, mess and disruption.

Timber-framed Annexes

Timber-framed annexes use a wooden framework with insulation and external cladding. They're generally lighter, quicker and potentially cheaper to construct than traditional brick-built annexes.

However, not all timber garden buildings are suitable for permanent residential use. They must meet the relevant Building Regulations, including insulation, fire safety and ventilation requirements, so simply adding a kitchen and bathroom to a standard garden room isn't enough.

Timber also needs protection against moisture and rot, and may require ongoing maintenance.

Modular Annexes

Modular annexes are constructed using pre-manufactured components that are assembled on site, significantly reducing construction time and disruption compared with traditional brick-built annexes.

Many modular systems use lightweight materials and can be installed on ground screw foundations, reducing the need for extensive excavation, heavy machinery and concrete. This makes them particularly suitable for properties with limited access.

Modern modular buildings can also offer excellent thermal efficiency, with high-performance insulation and relatively slim wall structures that maximise usable internal space. A choice of external finishes means they can be designed to complement the existing property.

However, not all modular annexes are built to the same standards. Construction methods, insulation levels, materials, specifications and warranties can vary considerably between manufacturers. It's important to research different systems, check that they're suitable for permanent residential use, comply with relevant Building Regulations, and read independent customer reviews before making a decision.

How Much Does a Granny Annexe Cost?

The cost of building a granny annexe can vary enormously depending on its size, construction method, specification and location. At the time of publishing (October 2026), estimates from a range of online sources vary from around £40,000 to £120,000, largely due to differences in building size, construction methods, specifications and what's included in the price.

When getting a quote for an annexe, it's important to understand exactly what's included. Some companies may advertise or quote a price for just the building shell, while others may include some or all of the additional costs involved in making the annexe ready to live in.

Additional costs may include:

Planning applications, Building Regulations approval, drawings and surveys
Groundworks and foundations
Electricity, water and drainage connections
Kitchen, bathroom and heating installation
Flooring, decoration and internal finishing
Landscaping and access paths
VAT

One point that many sources agree on, however, is that modular annexes can be considerably more cost-effective than traditional brick-built alternatives, particularly when reduced construction time and groundwork requirements are taken into account.

You can find out more about modular annexe buildings on our Leka Xi Modular Annexe Buildings page.

Granny Annexe FAQs

What Should I Consider When Designing a Granny Annexe?

The most important consideration is making sure the annexe is practical and comfortable for whoever will be living in it.

For an elderly or disabled relative, it's worth planning for future needs as well as their current requirements.

Features such as step-free access, wider doorways, non-slip flooring, level-access showers and easily accessible switches can make a significant difference.

Other considerations include adequate storage, natural lighting, ventilation, heating, security and internet connectivity.

It's also important to establish how the annexe will connect to existing utilities. Electricity and water can often be supplied from the main property, while drainage may require additional work or a pumping system depending on the location.

Can I Get Financial Help to Build a Granny Annexe?

There isn't a general government grant for building granny annexes, but financial assistance may be available in certain circumstances.

Disabled Facilities Grants can help towards eligible adaptations for people with disabilities, subject to assessment and approval by the local council. These shouldn't be assumed to cover an entirely new annexe.

Other funding options include savings, re-mortgaging, loans or equity release. As these can have significant financial implications, independent financial advice is recommended.

Will a Granny Annexe Add Value to My Property?

A well-designed annexe could make your property more attractive to buyers looking for multigenerational living arrangements or flexible accommodation.

However, the amount of value added will depend on the quality of the building, the local property market, the remaining garden space and any restrictions on its use.

There's no guarantee that the increase in property value will equal the construction cost.

It's also worth considering future uses. An annexe originally built for an elderly relative might later accommodate another family member or potentially be used as an office or studio, subject to any relevant restrictions.

How Long Does It Take to Build a Granny Annexe?

A traditional brick-built annexe may take several months to construct, depending on the size and complexity.

Modular annexes can be considerably quicker because much of the structure is manufactured in advance. Some systems can be assembled on site in just a few days.

However, the total project time will also include design, permissions, groundworks, utility connections and internal fitting.

Where planning permission is required, the standard decision period for many smaller applications in England is eight weeks after validation, although applications can take longer.

Do You Pay Council Tax on a Granny Annexe?

A self-contained granny annexe may receive its own council tax band, even when it forms part of the same property.

However, discounts and exemptions are available in certain circumstances.

50% discount: May apply when the annexe is occupied by a qualifying relative of the person responsible for council tax on the main house, or is used as part of the main home.
Full exemption: May apply when the annexe is occupied as their main home by a qualifying dependent relative, including someone aged 65 or over, substantially or permanently disabled, or severely mentally impaired.
Unoccupied annexes: An exemption may apply where the annexe cannot legally be let separately because of planning restrictions.

Eligibility depends on the circumstances, so check with your local council.

Can I Rent Out a Granny Annexe?

Possibly, but this depends on its planning status.

An annexe approved for use in connection with the main house may have restrictions preventing it from being occupied as an independent dwelling.

Renting it to an unrelated tenant or using it as holiday accommodation may require additional planning permission.

There may also be implications for council tax, insurance, mortgages and taxation.

If renting out the annexe is part of your plan, establish what's permitted before construction.

Which Type of Granny Annexe Is Right for Me?

A granny annexe can provide valuable additional living accommodation, whether you're planning for an elderly relative, helping an adult child gain independence or accommodating someone with additional needs.

The best solution will depend on your available space, budget and intended use.

Here at Warm Roof Division, we offer Leka XI modular buildings in a range of designs and finishes. Visit our Leka Xi Modular Annexe Buildings page for more information, or to get an instant online quote.

Get An Instant Quote Now

No need to enter your contact details or speak to a salesperson.

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How Can I Make My Conservatory Usable All Year Round?

Warm Roof Division — Mon, 12 Oct 2026 16:46:12 +0000

How can I make my conservatory usable all year round?

If you had a conservatory installed years ago when they were all the rage, or you've moved into a house that already has one, there's a good chance you've discovered that it's virtually unusable for much of the year.

Too hot in summer, freezing cold in winter, and often more trouble than it's worth, what should be an extra living space can quickly become a source of frustration.

The most common complaints about traditional glass and polycarbonate conservatory roofs include:

Unbearably hot temperatures during summer
Freezing cold temperatures during winter
Uncomfortable glare from the sun
Unsightly dirt and bird poo accumulating on clear roof panels
Polycarbonate panels becoming yellow and discoloured with age
Excessive noise from rain and hail, particularly with polycarbonate roofs

The good news is, you don't necessarily need a new conservatory to fix these problems!

Here at Warm Roof Division, transforming old, uncomfortable conservatories into practical living spaces that can be enjoyed throughout the year is what we do best.

We've put together this guide to explain the different conservatory roof replacement options available, including their advantages, disadvantages and relative costs.

Option 1 - Insulated Conservatory Roof Panels

The cheapest option is to have the old glass/polycarbonate roof panels replaced with insulated conservatory roof panels, such as Panel X.

Pros

Relatively cheap – Get an instant online quote here
1 day installation
Doesn’t usually require planning permission
Can usually be installed even on old frames
Improves temperature regulation – U-Value of 0.75-0.98
Eliminates 100% of glare caused by roof
Panels are 100% opaque, meaning no visible dirt or bird poo from inside
Dampens noise from rain and hail
Available in a wide range of style and colour options to match your property
10-year manufacturer’s warranty
Building regulation compliant

Cons

Can only be installed in uPVC and aluminium frames, not suitable for timber conservatories
Temperature regulation is improved, but not to the same level as with a tiled roof

You can find more information about and get an instant online quote for replacement insulated roof panels on our Panel X page.

Option 2 - Tiled Timber Warm Roof

The second cheapest option is to have the entire roof replaced with a fully insulated, tiled timber warm roof, such as the Icotherm System.

Pros

The cheapest type of warm roof we sell
Typically installed in just a few days
Doesn’t usually require planning permission
Can usually be installed on existing frames
Excellent temperature regulation – U-value of 0.15
Eliminates 100% of glare caused by roof (unless glass options are chosen)
Looks like a standard tiled roof from the outside, and a proper plastered ceiling inside, so no visible dirt or bird poo from inside
Significantly reduces noise from rain and hail
Available in a wide range of lightweight shingle and slate effect tiles to match your property
Fixed and opening roof glazing options can be added is required
10-year manufacturer’s warranty
Building regulation compliant

Cons

Heavier than GRP warm roofs, not suitable for all conservatories

You can find more information about timber warm roofs on our Icotherm page.

Option 3 - Tiled GRP Lightweight Warm Roof

The ultimate warm roof solution is to have the entire roof replaced with a fully insulated, tiled, lightweight GRP warm roof, such as the Leka System, which is the lightest on the market.

Pros

The lightest type of warm roof, suitable for virtually all conservatories
Typically installed in just a few days
Doesn’t usually require planning permission
Can usually be installed on existing frames
Excellent temperature regulation – U-value of 0.15
Eliminates 100% of glare caused by roof (unless glass options are chosen)
Looks like a standard tiled roof from the outside, and a proper plastered ceiling inside, so no visible dirt or bird poo from inside
Significantly reduces noise from rain and hail
Available in a wide range of lightweight shingle and slate effect tiles to match your property
Fixed and opening roof glazing options can be added is required
40-year manufacturer’s warranty
Building regulation compliant

Cons

More costly than insulated panels and timber warm roofs

You can find more information about lightweight GRP warm roof on our Leka page.

Which Conservatory Roof Replacement Is Right for Me?

The best option will depend on your budget, the condition of your existing conservatory and how you want to use the space.

If you're looking for an affordable way to improve insulation without replacing the entire roof structure, insulated roof panels could be the ideal solution.

If you'd prefer to give your conservatory the appearance and feel of a more permanent extension, a fully insulated warm roof with a plastered internal ceiling may be worth the additional investment.

For conservatories where roof weight is a particular consideration, a lightweight GRP system could offer additional advantages, although the existing structure will still need to be assessed.

Not sure which option would work best for your conservatory?

Warm Roof Division can help you explore the available solutions and find one that suits your property and budget.

Arrange Your Free No-Obligation Quote Today!

If you would like to arrange a free quote, click the button below,
and let us know the best time for us to contact you.

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Conservatory Roof U-Values Explained

Warm Roof Division — Mon, 12 Oct 2026 15:20:02 +0000

Conservatory Roof U-Values Explained

You may have heard the term 'U-value' used in relation to windows and doors, but what exactly is a U-value, and what does it mean for your conservatory roof?

The 'U' in U-value isn't an abbreviation for a longer word, as you might expect. It's the symbol used in engineering to represent the overall heat transfer coefficient. In simple terms, a U-value measures how easily heat passes through a building element, such as a roof, wall, window or floor. It's measured in W/m²K (watts per square metre per kelvin).

The lower the U-value, the better the insulation and the less heat can escape. This means that a conservatory roof with a low U-value will generally retain heat much more effectively during colder weather than one with a high U-value.

Typical Conservatory Roof U-Values

Conservatory roof type	Typical U-value (W/m²K)	Indicative thermal performance
Single-glazed glass (older installations)	5.7–5.8	Very poor
Older twin-wall polycarbonate (6–10mm)	2.9–3.7	Very poor
Older standard double-glazed glass	2.7–3.0	Poor
Triple-wall polycarbonate (16mm)	2.2–2.4	Poor
Modern Low-E double-glazed glass	1.0–1.6	Moderate
Multiwall polycarbonate (25–35mm)	1.2–1.7	Moderate
Insulated roof panels (25–35mm)	0.75–0.98	Good
Insulated warm roof systems	0.15-0.18	Excellent

How Much Heat Loss Can a Replacement Conservatory Roof Prevent?

	Reduction in Heat Loss
Conservatory roof type	Insulated Roof Panels	Insulated Warm Roof
Single-glazed glass (older installations)	Up to 87%	Up to 97%
Older twin-wall polycarbonate (6–10mm)	Up to 80%	Up to 96%
Older standard double-glazed glass	Up to 75%	Up to 95%
Triple-wall polycarbonate (16mm)	Up to 69%	Up to 94%
Modern Low-E double-glazed glass	Up to 53%	Up to 91%
Multiwall polycarbonate (25–35mm)	Up to 50%	Up to 91%

*Figures show the maximum indicative reduction in heat transmission, calculated using typical or published U-values. Comparisons are based on equivalent roof areas and temperature differences. Actual performance will depend on the existing roof specification, the replacement product and installation. U-values may relate to individual glazing units, panels or complete roof constructions, so comparisons are indicative rather than guaranteed whole-roof savings. Figures do not represent reductions in total conservatory heat loss or household energy bills.

You can find more information on replacement insulated roof panels on our Panel X page. Or to learn more about different warm roof solutions, visit our Leka, Icotherm, and Supalite pages.

Will a Lower U-Value Also Keep My Conservatory Cooler in Summer?

While U-values are particularly useful for understanding how well a conservatory roof retains heat during colder months, they are also relevant to summer temperatures.

A well-insulated roof slows down heat transfer in both directions, helping to reduce the amount of heat entering through the roof when it's hotter outside than inside.

However, there's another important factor to consider: solar gain.

Traditional glass and polycarbonate conservatory roofs allow sunlight to pass through, heating the surfaces and furnishings inside. This heat can quickly build up, particularly in south-facing conservatories, making them extremely uncomfortable during warmer weather.

The amount of solar energy passing through glazing is measured by its G-value. Unlike U-values, which measure heat transfer, G-values indicate how much of the sun's energy enters through the glazing. The lower the G-value, the less solar heat is transmitted.

This explains why even a modern double-glazed conservatory roof with a relatively low U-value can still allow the room to become unbearably hot in summer.

Typical Conservatory Roof G-Values

Conservatory Roof Type	Typical G-Value	Solar Energy Admitted
Single-glazed glass (older installations)	0.82–0.87	82–87%
Older twin-wall polycarbonate (6–10mm), clear	0.81–0.82	81–82%
Older standard double-glazed glass, clear	0.75–0.80	75–80%
Triple-wall polycarbonate (16mm), clear	0.75–0.77	75–77%
Modern Low-E double-glazed glass	0.40–0.75	40–75%
Multiwall polycarbonate (25–35mm), clear	0.60–0.78	60–78%
Insulated roof panels (25–35mm)	N/A (opaque roof)	0%
Insulated warm roof systems	N/A (opaque roof)	0%

*Opaque insulated roof panels and solid warm roofs block 100% of direct solar transmission through the roof, assuming no rooflights are fitted. However, some heat can still pass through the roof construction when its external surface is heated by the sun. Actual summer temperatures will also depend on windows, ventilation, shading and the conservatory's orientation.

Replacing a glass or polycarbonate roof with insulated roof panels or a solid warm roof tackles both problems. The opaque roof prevents direct sunlight from passing through the roof itself, while the insulation reduces heat transfer through the roof construction.

Although the temperature of a conservatory will still be affected by its windows, orientation and ventilation, an insulated replacement roof can make a significant difference to comfort during both summer and winter.

Arrange Your Free No-Obligation Quote Today!

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and let us know the best time for us to contact you.

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Our New Instant Online Modular Building Quote Calculators

Warm Roof Division — Fri, 10 Apr 2026 14:25:44 +0000

Our Modular Building Instant Online Quote Calculators Are Live! Get A Quote In Seconds - Without Entering Any Contact Details

We understand that sometimes people want to be able to get an idea of costs, without having to speak to a salesperson, book a site visit, or enter their contact details.

So we've introduced two new instant, online calculators:

Leka Xi Extension Instant Quote

Leka Xi Annexe Instant Quote

STEP 1 - Size

Enter the size of the building you want a quote for in metres, and click 'Calculate Base Price'.

You will then see a price for the basic structure, along with details of exactly what is included in that price.

STEP 2 - External Finish

You will then be asked to select the type of external finish you would like your quote to include. The additional cost is shown directly underneath, so you can click on the different options to get an idea of the difference in price, before settling on one.

STEP 3 - Roof

Next you'll be asked to select the type of roof you would like your quote to include, as well as any roof glass you might want. Again the additional cost for the roof element is shown directly underneath, so you can click on different options before choosing.

STEP 4 - Windows & Doors

Next you can select the type of windows and doors that you would like to include. Available options will appear below once a material has been selected.

Next you can select the quantity of each style of window and door that you would like to include.

STEP 5 - Optional Extras

Lastly, you can choose if you want to add any plastering or electrics to your quote.

STEP 6 - You Get Your Quote

Then simply click the 'Calculate Total Price' button, and the price will instantly be displayed on your screen, along with a summary of the costs - And that's it! No getting to the end only to be asked to enter an email or phone number in order to get your quote.

You can also view and print a detailed version of the quote to keep for your records if you wish to.

When you click 'Continue' you can either tell us that you have all you need, or you can choose to enter your contact details and request that we get in contact as a time that's suitable for you.

Are you ready to get your instant quote?

Leka Xi Extension Instant Quote

Leka Xi Annexe Instant Quote