Conservatory Roof Replacement in London
Freezing in winter, unbearable in summer? We replace failing conservatory roofs with modern polycarbonate, glass or insulated solid roofs that turn your conservatory into a room you actually use all year round.
Your Roof Options, Honestly Explained
There is no single best conservatory roof — the right choice depends on how you use the room and what the existing structure can support. These are the three replacements we install, with the trade-offs spelled out so you can decide with confidence.
Polycarbonate Replacement
The budget option: we swap tired, yellowed multiwall sheets for modern high-performance polycarbonate with better thermal and solar-control coatings. Same light-filled room, noticeably less heat loss and glare — and far quieter in rain than the old sheets.
Glass Replacement
Self-cleaning, solar-control glazing replaces ageing roof glass or polycarbonate, keeping the all-glass look while cutting overheating and condensation. We also replace misted or failed units and reseal perished bar caps and gaskets — the usual source of conservatory leaks.
Tiled & Warm Roof Conversion
The full transformation: the lightweight glazing comes off and a proper insulated solid roof goes on, with breathable membrane, rigid insulation and tiles or slates to match your house. This is what turns a conservatory into a genuine year-round living space — see how insulation build-ups differ in our warm roof vs cold roof guide.
On thermal performance, the jump is dramatic. Old polycarbonate roofs lose heat fast, which is why the room feels freezing within an hour of the heating going off. A modern glass roof with thermal breaks performs far better, and a tiled warm-roof conversion brings the conservatory close to the thermal standards of the house itself — most owners find the heating barely needs touching afterwards.
Building Regulations & Planning Considerations
Most conservatory roof replacements are straightforward, but it pays to know where the rules bite. As a roofer who has navigated this hundreds of times, here is what actually matters:
- Building regulations usually apply when you replace more than half the roof — because the thermal performance of the roof must not get worse, and in practice the new roof must meet current insulation standards.
- Switching to a solid/tiled roof is the one to get checked properly — the extra weight means the existing frames, walls and foundations need a structural assessment to confirm they can carry it. We arrange the survey and the building-control sign-off as part of the project.
- Like-for-like replacements rarely need planning permission — swapping glazing for glazing on an existing conservatory is generally permitted development, provided it stays within the original footprint.
- Condensation and ventilation must be designed in — a warmer roof without proper ventilation just moves the problem. Every warm-roof conversion we do includes ventilation and vapour control in the build-up.
- New seals, flashings and gutters come as standard — where the conservatory roof meets the house wall, we renew the flashing and abutment so the junction is genuinely weatherproof, not just patched.
Our Typical Conservatory Roof Project
From first call to final clean-up, most conservatory roof replacements take one to two weeks on site. Here is the process:
Free Survey & Structural Check
We inspect the existing roof, frames and drainage, confirm the structure can support your chosen option, and discuss how you want to use the room.
Fixed Written Quote
A no-obligation quote with the full specification — roof type, insulation, finishes and timescale. The price is fixed before we start.
Building Control Where Needed
For solid-roof conversions we handle the building-control notification and structural calculations, so the paperwork is sorted before work begins.
Installation & Weatherproofing
The old roof comes off, the new roof goes on with new seals, flashings and gutters — and the inside is protected throughout.
Conservatory Roof Replacement Costs in London (2026)
Realistic 2026 London price bands for a typical 3m × 3m conservatory. Size, roof shape, glazing specification and access all move the price, which is why we always quote from a free on-site survey.
| Replacement type | Typical 2026 price |
|---|---|
| Polycarbonate roof replacement (like-for-like upgrade) | £2,500 – £5,500 |
| Glass roof replacement (solar-control, self-cleaning) | £4,500 – £9,000 |
| Tiled / warm-roof conversion (insulated solid roof) | £8,500 – £16,000+ |
Warm-roof conversions cost more because of the structural assessment, building-control involvement and insulation build-up — but they also add usable living space, which is why most clients who make the switch say they wish they had done it sooner.
Signs Your Conservatory Roof Needs Replacing
Conservatory roofs do not fail overnight — they decline over years until the room becomes unusable. If several of these sound familiar, the roof has run its course:
- Freezing in winter, a greenhouse in summer — old polycarbonate has almost no insulation, so the room follows the outside temperature instead of holding the house's.
- Yellowed or cloudy panels — degraded polycarbonate lets in less light while still letting the heat pour out; cleaning cannot fix it.
- Leaks around the bar caps and flashing — perished gaskets and dried-out seals are the most common cause of conservatory drips.
- Condensation streaming down the inside — poor thermal breaks and ventilation mean warm house air condenses on the cold roof surface.
- Misted or blown double-glazed units — sealed units that have failed lose their insulation value and look permanently foggy.
- You have stopped using the room — the surest sign of all. A conservatory that has become a storage space is a room worth reclaiming.
Why London Chooses Victoria Roofing
Family-run since 1982
Over 40 years of roofing across London — the same family name on every job, and a reputation built one roof at a time.
5.0 from 338 Google reviews
Hundreds of London homeowners rate us five stars for honest advice, tidy work and fair pricing.
Free, no-obligation quotes
Every project starts with a proper survey and a fixed written quote — no hidden fees and no pressure.
Fully guaranteed workmanship
We stand behind every roof we install. Our workmanship guarantee means we come back and put it right if anything fails.
Conservatory Guides & Related Services
From our blog
Related services
- Skylight Installation in London — add daylight to your new conservatory roof
- Skylight Repair in London — leaking or misted roof windows fixed
- New Roof Installation in London — full pitched roof renewals in slate and tile
Working across London, including:
Conservatory Roof Replacement Questions
Usually not. Replacing the roof of an existing conservatory on a like-for-like basis is generally permitted development, provided the footprint does not change. If the work extends the conservatory or it sits in a conservation area or on a listed building, we will flag it at the survey and advise on the right route.
For a tiled or warm-roof conversion, yes — building control must be satisfied that the thermal performance meets current standards and that the existing structure can carry the extra weight. We handle the structural assessment, calculations and building-control notification as part of the project, so you do not have to manage any of it.
A like-for-like polycarbonate or glass replacement typically takes two to four days on site. A tiled warm-roof conversion takes one to two weeks, including the structural work and building-control checks. We give you a firm timescale in your fixed written quote before work starts.
In 2026, a typical 3m × 3m conservatory costs £2,500–£5,500 for a polycarbonate replacement, £4,500–£9,000 for solar-control glass, and £8,500–£16,000+ for a tiled warm-roof conversion. Every project starts with a free, no-obligation survey and a fixed written quote based on your roof's actual size and specification.