Conservatory Roof Replacement Options, Costs and Rules

Replacing a conservatory roof typically costs from £2,000 for polycarbonate to £15,000 for a solid tiled roof, depending on the size and materials you choose. Swapping an old translucent roof for a solid one is a common way to make a conservatory more comfortable. Upgrading to a solid roof means building regulations will apply, so you need to understand the rules before you start. This guide explains your options, typical prices, and the structural checks your installer must carry out.

Why people replace a conservatory roof

Many older conservatories were built with polycarbonate roofs. This material lets the light in but offers little insulation, so the room can be cold in winter, hot in summer and noisy when it rains. Polycarbonate has a typical lifespan of 10 to 15 years, after which it often becomes brittle, discoloured and prone to leaks.

When the seals fail and leaks start, ignoring these common roof problems only leads to damp and rot inside. Some people opt for better glazing to solve these issues, while others choose a solid tiled roof to make the space feel like a proper extension. Replacing the roof is significantly cheaper and less disruptive than knocking the whole structure down and building a brick extension from scratch.

Your main replacement options

You have three main choices when replacing your roof, plus a hybrid option that combines two of them. Each material has different structural requirements and price points.

• Polycarbonate panels are the cheapest replacement and the lightest on your existing frames.
• Glass roofs use double or triple glazing to reduce noise and improve insulation while keeping the room bright.
• Solid or tiled roofs use lightweight tiles or slates over insulation to make the room feel like a standard house extension.
• Hybrid roofs combine a solid insulated structure with large glazed panels to balance thermal efficiency and natural light.

If you are on a tight budget and the existing frames are weak, simply replacing the old polycarbonate with thicker, modern polycarbonate is a quick fix. Glass is a step up, offering better noise reduction and thermal performance. Modern conservatory glass often comes with solar control coatings to reflect summer heat and self-cleaning treatments to reduce maintenance.

A solid tiled roof is the ultimate upgrade for thermal performance. It usually consists of a timber or aluminium frame, thick insulation, and lightweight exterior tiles or synthetic slates that match your main house roof. The interior is finished with a plastered ceiling, often with integrated spotlights. A hybrid roof gives you the plastered ceiling and insulation of a solid roof, but with large glass panels inserted to ensure the room below does not lose too much natural light.

What a conservatory roof replacement costs

A straight replacement of an old polycarbonate roof with new polycarbonate is the cheapest option. Moving to a solid tiled roof requires structural checks, insulation and building regulations approval, which pushes the price up. The table below shows what you can expect to pay for the complete replacement of a standard conservatory roof.

The prices above are typical published figures for 2026, and your local quotes will differ depending on your location and the complexity of the roof.

If you choose a solid tiled roof, the size of your conservatory dictates the final bill. A small 3x3m tiled roof typically costs £6,100 to £8,500. A medium 4x4m tiled roof ranges from £8,000 to £12,000. A larger 5x5m tiled roof usually costs between £10,000 and £15,000. A quality insulated replacement roof typically costs £8,000 to £14,000.

Small repairs are usually charged at a fixed price or a day rate, but a full roof replacement is priced by the size of the roof and the materials used. Prices are generally higher in London and the South East. You must also ask your installer if waste removal, scaffolding and VAT are included in their price. Nobody can see rotten timber or damaged frames until the old covering is off, so a proper written quote will always state how any extra repair work will be priced.

Can your existing frames take a solid roof?

A solid roof is heavier than the polycarbonate it replaces. Compared with a glass roof, a lightweight solid roof system is likely to add only a small extra load, but the existing window frames and foundations must still be able to support it safely. According to guidance from Local Authority Building Control (LABC), frames built originally for a polycarbonate roof may only have enough reinforcement for that specific lightweight load.

If there is no steel or aluminium reinforcement inside the plastic frames, they may not be strong enough to carry a solid roof. In these cases, you may need new window frames or additional structural posts to support the new roof. A professional installer will check the structural integrity of your current setup before they finalise their quote.

Nobody can see exactly what is inside a sealed plastic frame just by looking at it. However, experienced fitters know what to look for and how to test the frames for hidden supports. If your foundations are shallow or your frames are old and brittle, replacing the roof alone might not be viable. In that scenario, rebuilding the conservatory may be the honest answer.

Building regulations for a solid conservatory roof

Most conservatories are built in the first place without needing building regulations approval. According to the Planning Portal, a conservatory in England is exempt when it is built at ground level and is less than 30 square metres in floor area. It must also be separated from the house by external quality walls, doors or windows, and have an independent heating system with separate controls. The glazing and fixed electrics must comply with the relevant requirements. Any new structural opening between the conservatory and the house needs building control approval.

This exemption only applies while the roof is mostly translucent. The LABC states that when work significantly reduces the proportion of glazing or the translucence of the roof, the conservatory can no longer be considered exempt. This means the new solid roof must fully comply with the Building Regulations. You cannot simply put a solid roof on an exempt conservatory and ignore building control. These are the rules for England. They differ in Scotland and Northern Ireland, so check with your council if you live there.

Building control is likely to check the roof structure design, how loads pass through the existing frames, the adequacy of foundations, and weatherproofing. They will also check that the new roof meets Part L of the building regulations, which covers energy efficiency, as a new thermal element. The rest of the structure is treated as needing to be no worse than before, and the conservatory should stay thermally separated from the house. In practice, this means keeping the external doors between your house and the conservatory.

Do you need planning permission?

Planning permission is a completely separate set of rules from building regulations. Planning controls what a building looks like and where it sits on your land, while building regulations control how safely it is built. Replacing a conservatory roof with a like-for-like material does not usually need planning permission. A change to a solid roof is often covered by permitted development rights too, but the Planning Portal says planning permission may be required if the change significantly alters the structure or appearance of the roof.

However, there are exceptions you need to be aware of. The Planning Portal notes that a conservatory falls within the same planning rules as any other home extension. Permitted development rights do not apply to flats and maisonettes.

Extra controls apply if your home is a listed building or in a conservation area, so check with your council before any work. The same applies to properties where a planning condition or an Article 4 Direction specifically restricts your permitted development rights. If you are unsure about your home's status, always check with your local council's planning department before starting any work. Guessing wrong can lead to enforcement action.

How long the work takes

Replacing a conservatory roof is a relatively fast project compared to building a new extension. A standard installation usually takes two to five days from start to finish. The exact time depends heavily on the materials you choose and whether your existing frames need reinforcing.

Replacing old polycarbonate with new polycarbonate panels is the fastest option. This straightforward swap typically takes one to two days. Fitting a solid tiled roof involves much more work. The installers have to remove the old roof, build a new structural frame, install exterior boards and waterproof membranes, and lay the tiles.

Inside, they must install thick insulation, vapour barriers, and finish the ceiling with plasterboard. Because of these extra steps, a solid roof replacement usually takes three to five days. The weather can delay progress, as the roof structure needs to stay dry while the new covering goes on. Internal plastering also needs time to dry before you can paint it and move your furniture back in.

Who should do the work and consumer protection

Roofing is a highly skilled trade, and a conservatory roof replacement involves complex structural and thermal calculations. Look for an installer who is registered with a competent person scheme or a government-endorsed quality scheme. CompetentRoofer is a government-authorised competent person scheme run by the National Federation of Roofing Contractors (NFRC). Its registered roofers can self-certify the replacement of ordinary roof coverings in England and Wales. Swapping a translucent conservatory roof for a solid one is a different kind of job, so expect it to need an application to council building control or a registered building control approver, and ask the installer who will make it.

TrustMark is the government-endorsed quality scheme for work in and around the home. Check any claimed registration on the scheme's own register. Membership is a good sign, not a guarantee.

Be wary of common scams in this trade. Cold callers often spot moss or a loose tile from the street and use high-pressure tactics to force a quick decision. If you need to choose a roofing company you can trust, never accept a quote that is written on a scrap of paper, demands cash only, requires a huge upfront deposit, or comes from a firm with no physical address. Vague one-line quotes are a massive red flag. You should also avoid guarantees that are worthless if the firm folds because they are not insurance-backed.

Under the Consumer Rights Act 2015, all work must be done with reasonable care and skill. If it is not, you can ask for it to be put right or for money back. A quote is a fixed price, whereas an estimate is not. Contracts agreed at home, by phone or online normally carry a 14-day cooling-off period. If you ask for work to start inside that period, you must pay for what has been done. Paying by credit card gives you Section 75 protection on purchases over £100 and up to £30,000. If you end up in a dispute with a tradesperson, Citizens Advice is the place to go for help.

Common questions

Can I replace my conservatory roof myself?

You should never attempt to replace a conservatory roof yourself. Working at height is dangerous, and installing a solid roof requires precise structural calculations to ensure your frames do not collapse under the weight. It also requires a solid understanding of building regulations and ventilation to prevent severe condensation problems from rotting the timber.

Will a solid roof make my conservatory darker?

A solid roof will stop light coming in from above, which will make the conservatory itself darker than it was with a fully glazed roof. It may also reduce the amount of natural light reaching the adjoining rooms in your house. If losing light is a major concern, a hybrid roof with large glazed panels built into the solid structure is an excellent compromise.

Do I need a building regulations certificate to sell my house?

When you come to sell your property, the buyer's solicitor is likely to ask for proof that work such as a new solid roof complies with building regulations. If you upgraded a translucent conservatory roof to a solid tiled roof and skipped building control, you will not have this certificate. This can stall your house sale or force you to pay for expensive retrospective approvals.

Can I just put roof tiles over my existing polycarbonate?

You should never let anyone simply clad over or screw tiles directly into your existing polycarbonate roof. This adds weight to a structure that was not designed to hold it, and the work still needs building regulations approval because the roof is no longer translucent. It can also trap moisture between the layers, which leads to condensation and damp. A proper solid roof replacement involves removing the old roof entirely.

What are the best conservatory roofing tiles?

A solid conservatory roof uses lightweight synthetic tiles or metal tiles rather than traditional heavy clay or concrete tiles. These lightweight options are designed specifically to put less strain on conservatory frames while mimicking the look of natural slate or standard roof tiles. Your installer will show you options that match the existing roof of your house to help the conservatory blend in.

Your next steps

Before you agree to any work on your conservatory, gather enough information to make an informed choice. Take your time, compare your options, and never let a cold caller rush you into signing a contract. A good roofer will happily answer your questions and provide everything in writing. Use this checklist to protect yourself and ensure the job is done right.

• Take clear photos of your current roof and any leaks from the inside to show the roofers when they visit.
• Ask three different local roofing companies to inspect the conservatory and provide written quotes.
• Ensure each quote clearly itemises the cost of materials, labour, waste removal, scaffolding, and VAT.
• Ask the installer how they plan to check if your existing window frames are strong enough for a solid roof.
• Check who is responsible for notifying building control if you are upgrading to a solid roof.
• Ask to see proof of the firm's public liability insurance and employers' liability insurance.

• Agree a staged payment plan that leaves a final payment to be made only when the job is completely finished.
• Ensure any guarantee offered is insurance-backed so it remains valid if the company stops trading.
• Make sure you receive the building regulations certificate for the new roof once the work has been signed off. This is a completion certificate from the council, a final certificate from a registered building control approver or a compliance certificate from a competent person scheme.
• Keep all your paperwork, quotes, and certificates safe for when you eventually sell your home.

By understanding the rules, knowing what a fair price looks like, and asking the right questions, you protect yourself from poor workmanship and unexpected bills. Take your time to compare three quotes, verify the company's credentials, and find a roofer near you to inspect the conservatory and quote for the work.