Quick Summary (TL;DR)
Replacing a glass or polycarbonate conservatory roof with a solid or tiled roof generally needs Building Regulations approval, because removing most of the roof glazing usually means the conservatory is no longer exempt. Insulated panels or linings that significantly reduce the glazing can have the same effect, so ask for written confirmation before accepting that no approval is needed. Removing the doors between the house and the conservatory, or extending the house heating into it, also ends the exemption. Since 6 November 2026, councils in England can charge for processing the notices and certificates that independent Building Control providers submit, and fees vary by council. Work that needed approval but never had it can cause delays and extra costs when you sell.
With more than 40 years of experience, Cristal Windows surveys and replaces conservatory roofs for homeowners across Hampshire, Surrey and Berkshire. The questions we are asked have changed over that time. Most people no longer only want to know which roof looks best. They want to know whether the work needs approval, who arranges it, what it costs, and what happens if it is skipped.
This guide answers those questions in plain English. It explains when a conservatory is exempt from Building Regulations, why a solid or tiled conservatory roof replacement usually changes that, where cheaper insulation products fit in, what the new Building Control charging rules that came into force on 6 November 2026 mean for you, and why removing the doors to the house is a bigger step than it looks.
Last reviewed 12 November 2026. This guide covers houses in England. Rules in Wales, Scotland and Northern Ireland are different.
When is a conservatory exempt from Building Regulations
Building Regulations generally apply when you extend your home. Conservatories are the main exception, but only while they meet a specific set of conditions. If one condition stops being met, the exemption can go with it.
The conditions for exemption
Planning Portal guidance and a government circular letter to building control bodies set out the conditions. A conservatory is normally exempt when:
- it is at ground level, single storey and under 30 square metres in floor area
- it is separated from the house by external quality walls, doors or windows
- it has its own heating with separate temperature and on and off controls, rather than an extension of the house heating
- its glazing and any fixed electrical work meet the relevant Building Regulations
- a significant proportion of its walls and roof are glazed
The last condition matters most when a roof is replaced. The government letter makes clear that whether a structure is exempt is decided case by case by the building control body, taking into account how much of the walls and roof are glazed.
How later work can end the exemption
The same letter gives three examples of later work that can end the exemption: extending the house heating into the conservatory, removing the thermal separation from the house, and significantly reducing the amount of glazing in the walls or roof. Once a building control body decides the structure is no longer an exempt conservatory, the new work must meet the applicable Building Regulations, and the rest of the structure must be no worse than it was before.
Does a solid or tiled conservatory roof need Building Regulations approval
In general, yes. Replacing a glass or polycarbonate roof with a solid or tiled roof removes most of the glazing from the roof, so the conservatory usually no longer qualifies as exempt and the new roof is assessed as building work. Our guide to conservatory roof types compares the different systems if you are still choosing.
What Building Control looks at
LABC guidance on solid conservatory roofs explains what inspectors typically check:
- Foundations: whether the existing base can carry the new load, sometimes confirmed with trial holes
- Frames: whether the window frames have enough internal reinforcement to support the roof, or whether new frames or extra posts are needed
- Weatherproofing: the roof itself, the joints against the house and the rainwater goods
- Energy efficiency: the new roof must meet current standards as a new thermal element
A roof being described as lightweight does not remove the need for these checks. Weight is only one part of the assessment.
Why the survey matters before the quote
This is why Cristal Windows checks the frames, base and walls during the survey, not only the roof. If the existing structure needs strengthening, you find out before you sign rather than halfway through the job.
How Cristal Windows arranges approval for Warmer Roof installations
For tiled roof replacements Cristal Windows specifies the Warmer Roof system. Warmer Roof works with an independent Building Control inspection company and offers this service to the installers who fit its roofs, including Cristal Windows. The installation is inspected against the Building Regulations, and completion documentation is issued by the Building Control provider once the work has passed inspection. The Building Control fees are passed on to you and set out in your quotation, so you can see them before you agree to anything.
Insulated panels and internal linings sold as not needing approval
Not every product sold as a conservatory roof upgrade is a replacement roof. We regularly meet homeowners who have been offered cheaper systems and told they are compliant and do not need Building Control. For some jobs that may be right. For others it is not, and it is the homeowner who is left holding the risk.
Panels that replace the glass in the existing frame
Some systems take out the glass or polycarbonate and fit opaque insulated panels into the existing roof bars. The original frame stays, but the roof is no longer glazed. Under the government guidance described above, significantly reducing the glazing in the roof can end the exemption, whatever the product is called.
Linings and insulation fitted under the existing roof
Other products are fixed to the inside of the existing roof as an insulated ceiling, cladding or a lining under the glazing. LABC guidance recognises that some options simply underdraw or overclad an existing polycarbonate roof. Whether a particular lining needs approval depends on what it does to the roof. Blocking out most of the light, adding load to a frame that was not designed for it, and trapping moisture between layers are all points to raise with the supplier.
Get the position in writing
If you are told no approval is needed, ask the supplier to confirm that in writing for your specific installation and to say which building control body agreed. If they cannot, you can contact your local authority building control team yourself before work starts. Be aware that councils no longer have to offer a free first hour of advice, so advice may be charged.
What changed for Building Control fees on 6 November 2026
On 6 November 2026 the Building (Local Authority Charges and Amendments Relating to Charging) (England) Regulations 2026 came into force. They replace the 2010 charging rules in England and widen what councils can charge for. The government’s stated aim is that the people commissioning building work pay the cost of regulating it, rather than local taxpayers.
What councils can now charge for
Alongside the familiar application and inspection fees, the new rules allow councils to charge for:
- accepting or rejecting the notices and certificates that independent Building Control providers, known as Registered Building Control Approvers, send to the council, including the initial notice at the start of a job and the final certificate at the end
- advice given in advance of an application
- enforcement and compliance action where work breaks the regulations
- regularisation applications for work carried out without approval
What it means for a conservatory roof
Where an independent provider handles Building Control, as it does for Warmer Roof installations, the provider must notify the council when the job starts and when it is finished. From 6 November 2026 the council can charge for processing those notices, the regulations make the client responsible for paying, and the council can reject a notice if the charge has not been paid. Each council sets its own charges and must publish its charging scheme at least seven days before it takes effect. Fees vary by council, and not every council started charging on the first day.
Why the cheapest quote may not be the cheapest job
Proper approval has a cost, and when the work needs it, it is not optional. A quote that leaves Building Control out may look lower, but if approval was needed, putting it right later usually costs more. When you compare quotes, check whether each one includes Building Control and who is arranging it. Our conservatory roof cost guide explains what else a complete quote should cover.
Can I remove the doors between my house and conservatory
It is one of the most common requests we hear: take out the old patio doors, open the conservatory up to the kitchen or living room and create one large space. It can be done, but it is a much bigger step than it looks.
Why the doors matter
The external quality doors or windows between the house and the conservatory provide the thermal separation that keeps a conservatory exempt. Remove them and the conservatory becomes part of the heated house, so it is no longer treated as an exempt conservatory.
What is likely to be needed
Any new structural opening between the house and the conservatory needs Building Regulations approval, even if the conservatory itself is exempt. Beyond that, Building Control will want to see that the enlarged space meets the energy efficiency requirements. Depending on the design, that can mean heat loss calculations, better glazing, an insulated roof, wall or floor improvements, and input from a structural engineer for the opening.
Planning permission is a separate question
Building Regulations and planning permission are different things. Internal changes on their own do not usually need planning permission, but listed buildings need consent for internal alterations, and other restrictions can apply to some homes. Check with your local planning authority before you commit.
Conservatory windows and doors and FENSA
FENSA certificates are familiar to most homeowners from replacement windows, so it is natural to assume they cover conservatory work too. They do not.
What FENSA covers
FENSA is a competent person scheme for replacement windows, doors, roof windows and rooflights in existing homes. FENSA states that conservatories and porches fall outside the scheme, because under the Building Regulations they are generally not part of the thermal envelope of the house. The one exception FENSA notes is the inner door leading into the conservatory, where it has at least 50 percent glazing and is replaced like for like.
Replacing the frames under the roof
If the conservatory windows and doors are replaced at the same time as the roof, the approval route depends on whether the conservatory will still be exempt once the work is done. Where it will not, ask how the frames are being dealt with in the Building Control process. Your surveyor should explain which applies before you sign.
What happens if approval was needed but not obtained
Problems with unapproved work rarely appear on the day the installers leave. They tend to surface years later, most often when the house is sold.
When you sell your home
Buyers’ solicitors ask for evidence that work which needed approval was approved. Councils record regularisation applications against the property, and these appear in local searches. Missing paperwork can lead to delays, more questions, specialist reports or a request for remedial work. It does not automatically stop a sale, but it can make one slower and more expensive.
Putting it right after the event
Work carried out without approval can sometimes be approved retrospectively through a regularisation application, which only the local council can deal with. The council may ask for parts of the work to be opened up for inspection and may require changes before it issues a certificate. It can also take enforcement action where work does not comply. Regularisation is chargeable under the new rules.
Insurance and mortgages
Whether unapproved work affects your home insurance or a mortgage lender depends on the policy and the circumstances. It is worth checking rather than assuming either way.
Which conservatory work usually needs approval
The table below summarises the situations we come across most often. It is a guide only. Your building control body makes the final decision for your home.
| Work | Usually needs approval | Why |
|---|---|---|
| Like for like glass or polycarbonate roof replacement | Not usually | The roof stays glazed, provided the structure is not being changed |
| Solid or tiled replacement roof, including Warmer Roof | Yes, generally | Most of the glazing in the roof is removed |
| Insulated panels fitted in place of the roof glass | It can | Significantly reducing the roof glazing can end the exemption |
| Insulated lining or ceiling under the existing roof | Depends on the system | Ask for written confirmation for your installation |
| Doors removed or a new opening made between house and conservatory | Yes | Thermal separation is lost and structural openings need approval |
| House central heating extended into the conservatory | Yes, the exemption is lost | An exempt conservatory needs its own heating controls |
Seven questions to ask before you accept a conservatory roof quote
Whoever you choose, these questions will tell you whether the regulations have been thought through before any work starts.
- Does this roof need Building Regulations approval for my home, and who has confirmed that?
- Who is arranging the application and the inspections?
- Are the Building Control fees, including any council charges, shown in the quote?
- Has the surveyor checked that the base and frames can carry the new roof?
- What happens, and what does it cost, if extra structural work is needed?
- What paperwork will I receive when the job is finished?
- If I want to remove the doors to the house later, what will that involve?
Frequently asked questions
Short answers to the questions homeowners ask us most often about conservatory roofs and Building Regulations.
Do I need Building Regulations approval to replace my conservatory roof
It depends on the new roof. A like for like glass or polycarbonate replacement does not usually need approval. A solid or tiled roof generally does, because removing most of the glazing means the conservatory is usually no longer exempt.
Is a lightweight solid roof exempt from Building Regulations
No. Being lightweight does not make a roof exempt. Building Control still checks the foundations, frames, weatherproofing and energy efficiency of the new roof.
Do insulated roof panels need Building Control
They can. Significantly reducing the glazing in a conservatory roof can end its exemption, so ask the supplier for written confirmation of the position for your installation before work starts.
Can I put a radiator in my conservatory
Not without affecting its exemption. An exempt conservatory needs its own heating with separate controls. Extending the house central heating into it means it is no longer treated as exempt.
What changed for Building Control fees in November 2026
From 6 November 2026, councils in England can charge for processing the notices and certificates that independent Building Control providers submit, as well as for advice, enforcement and regularisation. Each council sets its own charges, so fees vary by council.
Does FENSA cover conservatory roofs
No. FENSA covers replacement windows, doors, roof windows and rooflights in existing homes. Conservatories and porches are outside the FENSA scheme.
Can I sell my house if my conservatory roof was never approved
Usually, but it can cause delays and extra costs. Buyers’ solicitors may ask for evidence of approval, and you may need to apply for regularisation, which the council will only grant once it is satisfied the work complies.
Official guidance and useful resources
This guide is based on the official sources below. They are worth reading if you want to check the detail for yourself.
- Planning Portal: conservatories and Building Regulations: the official guide to when a conservatory is exempt
- GOV.UK: circular letter on conservatories and porches (2013): the government letter explaining how later work can end the exemption
- LABC guidance on solid roofs to conservatories: what building control teams check when a translucent roof is replaced
- legislation.gov.uk: the Building Control charging regulations 2026: the full text of the rules that came into force on 6 November 2026
- GOV.UK: building charges reform, government response: why the charging rules changed and what councils can now charge for
- FENSA: conservatories and the FENSA scheme: confirmation that conservatories fall outside FENSA
- Planning Portal: find your local building control authority: to contact your council directly
Talk to Cristal Windows about your conservatory roof
If you are thinking about a new conservatory roof, or wondering whether opening your conservatory up to the house is realistic, Cristal Windows can survey the whole structure, explain what approval your project needs and give you a clear written quote with the Building Control costs shown. We supply and install across Hampshire, Surrey and Berkshire.
Book your free conservatory roof survey
This guide is general information for houses in England, correct at 12 November 2026. Requirements depend on your property and the work proposed. Your building control body and local planning authority make the final decision.
