DIY conservatory roof kits: what you get and what can go wrong

“Conservatory roof kit” covers very different products, from a complete insulated tiled roof to a pack of polycarbonate sheets, and it is one of the most searched topics around conservatory roofs. This guide explains what each kind of kit includes, what the rules say, and what tends to go wrong. We have not tested any kit or reviewed individual retailers’ ranges, so use it as a checklist when you look at one. If you are weighing up the whole job yourself, our guide on replacing a conservatory roof yourself covers the wider picture.

What is a conservatory roof kit?

It is a set of parts made to fit your conservatory, delivered for assembly on site. For a tiled warm roof that means a frame, insulation, membrane, tiles, gutters and trims cut to a survey. The term is also used for replacement polycarbonate sheets, insulated panels and internal ceiling lining kits.

Kit	What it is	Building regulations	Main risk
Tiled or solid warm roof	A complete new roof structure, insulation and tiles, designed to a survey	Application needed when it replaces a glass or polycarbonate roof	The frames and base must carry the extra load
Replacement polycarbonate sheets	New sheets for the existing glazing bars	Usually exempt if the conservatory still meets the exemption afterwards	Working at height; sheets fitted the wrong way up
Insulated panels	Opaque panels that replace the sheets in the existing bars	LABC’s position is that making the roof significantly less translucent ends the exemption	Heat still escapes through the old bars and ridge
Internal lining or ceiling kit	Insulation fixed under the existing roof	Likely to need approval on LABC’s reasoning, though this is not settled	Trapped heat, damage to the glazing bars, condensation
Glass roof	New glass units, normally on a new frame designed for glass	Usually exempt if the conservatory still meets the exemption	Bars built for polycarbonate may not carry glass

What comes in a tiled roof kit, and what does not

The branded warm roofs are designed to a survey of your conservatory and delivered as a set of pre-cut parts. Guardian’s installation guide says its components arrive “in pre-cut sections”, numbered to match a layout plan. Leka’s roofs are designed on CAD, then cut and packed by a fabricator. Working through the makers’ published installation guides, a tiled roof kit is typically built from:

• a ring beam or eaves beam that sits on the window frames;
• a wall plate or box gutter fixed to the house wall;
• rafters, a ridge, hips and jack rafters;
• tie bars, where the design calls for them;
• deck boards and insulation (Leka specifies 130mm of insulation board, SupaLite 100mm of PIR between its rafters);
• a breathable membrane, battens, tiles or slates, and ridge and hip caps;
• gutters, fascias and soffits; and
• internal battens for the ceiling.

Several things are often outside the kit. Ultraframe’s LivinRoof guide lists the 12.5mm foil-backed plasterboard as installer supplied, and tells fitters to pass its plastering guidance on to the plasterer, because skimming is a separate trade. Wiring for ceiling lights goes in at first fix and needs an electrical certificate. Structural work, such as posts or reinforced frames, is priced separately, and so are the skip, scaffolding and building control fee.

The kit is also only as good as the survey behind it. Guardian’s layout plan requires “that all the windows are fully reinforced”, and Leka’s installer guide says “It is the sole responsibility of the installer to establish the structural suitability of the existing conservatory wall system”. If you fit it yourself, that responsibility is yours.

Can you buy a tiled conservatory roof kit supply-only?

Yes, but not from every brand. Ultraframe’s UltraRoof is also supplied for self-build through DIY retailers such as DIY Conservatory Shop and Conservatory Roof Shop, and TekFab (formerly Alutherm) sells supply-only tiled roof kits to trade and DIY buyers. Guardian, SupaLite and Leka sell through installers, and Guardian’s promise only covers roofs its certified installers fit.

The guarantee is the catch. Guardian’s promise includes a 10-year product guarantee, a 10-year workmanship guarantee and an insurance-backed guarantee, all tied to its certified installers. SupaLite describes an “Installer Guarantee” when an approved installer fits the roof. Ultraframe gives a 10-year parts guarantee on UltraRoof, with installer warranties varying. TekFab says there is a “Manufacturer Warranty with every order”, but does not state its length, and publishes no U-value, weight or certification for its kit. If you buy a kit to fit yourself, ask in writing what the guarantee covers and whether it depends on who fits it.

Materials are not cheap either. MyJobQuote’s 2026 guide puts the materials alone for a tiled conservatory roof at £2,000 to £4,000 for a small (3m x 3m) conservatory and £2,000 to £7,000 for a 4m x 4m one. On MoneySavingExpert, one poster noted that these roofs are manufactured as kits for assembly on site, and another described a roof built from lightweight tile sheets on marine plywood.

Do building regulations apply to a DIY roof kit?

Yes. The building regulations apply to the work, not to who does it. If a kit replaces a glass or polycarbonate roof with a solid one, LABC says you need to submit a building regulations application, and building control will check the frames, foundations and new roof before issuing a completion certificate.

No competent person scheme covers a solid conservatory roof conversion. The government-listed schemes cover replacement windows and doors, or replacing the covering on an existing roof, so neither you nor a FENSA-registered firm can self-certify it. Your options are a full plans application (a decision within 5 weeks, or 2 months with your consent), a building notice (work can start 2 days after it is submitted, but there is no formal approval), or a registered building control approver instead of the council. See our building regulations guide for the detail.

A kit with an LABC Registered Detail or a private type approval does not change this. The LivinRoof certificate says it is designed to “fast-track, not remove, the requirement to obtain Building Regulation Approval”. GOV.UK warns that without approval you will not have the certificates you may need when you sell.

Polycarbonate sheet kits: the most realistic DIY job

Re-sheeting keeps the existing glazing bars and swaps the old sheets for new ones. The published guides describe four steps:

1. Remove the glazing bar top caps and end caps. Ultraframe says the top cap clips are likely to be damaged and will need replacing.
2. Take out the old sheets, and inspect the bars, rafters and seals.
3. Fit the new sheets with the flutes running downhill, solid tape at the top end and breather tape at the bottom so condensation can escape.
4. Refit the caps and end caps, and seal the screw holes.

One DIY blog describes two people re-sheeting a lean-to with 25mm multiwall sheet in a full day, reusing the flashing, for £324 in materials in 2016. The authors advise cutting sheets to no more than 700mm wide. A supplier case study replaced the glazing bars too, as a precaution, because the originals were at least 10 years old. For current prices, one online retailer listed a 2100mm x 2000mm sheet of 25mm opal polycarbonate at about £125 including VAT in September 2026, and a panel seller says hardware stores charge from around £35 to £50 or more per square metre.

Stay off the roof. Ultraframe says it is not safe to stand directly on a conservatory roof, and one installer says you should not walk on a polycarbonate roof. Our guide to polycarbonate thickness explains the difference between 16mm, 25mm and 35mm sheets.

Insulation kits and panels: check the claims

Insulated panels slot into the existing roof bars in place of the polycarbonate. Makers quote a U-value of 0.29 W/m²K for 75mm panels and installation in about a day, while PanelX quotes 0.98 for its 25mm panel and 0.75 for its 35mm one. Approved Document L sets 0.15 W/m²K for a new roof in an existing home in England, so even the best panels insulate about half as well as a compliant new roof, before allowing for the bars.

A solid-roof installer, who competes with panel sellers, argues that panel U-values are quoted at the panel’s thickest point while heat escapes at the same rate through the old bars and ridge, that aluminium skins without thermal breaks risk condensation, and that the guarantee often covers only the panels. One panel seller gives a 10-year panel guarantee but a 1-year workmanship warranty.

Internal lining kits and DIY ceilings are cheaper again. MyJobQuote puts DIY roof insulation materials at £320 to £800 for a medium conservatory, and multifoil rolls of the kind some ceiling installers use cost about £96 to £144 including VAT for a 12m² to 15m² roll at one retailer. MoneySavingExpert posters reported DIY insulated ceilings for around £500 to £1,000, and one suggested an office-style suspended ceiling for under £1,000 against a £6,400 quote for a solid roof. The retailer’s own conservatory guide says to fit multifoil at 5°C or above with 50mm overlaps and taped joints, and to watch blinds and curtains for mould. Ultraframe warns that fixing battens and insulation under a glazed roof can damage the glazing bars, add weight, trap heat, cut light and use untested materials.

On the rules, a review of one panel brand repeats the claim that no building regulations are needed. LABC’s guidance says work that “significantly reduces the proportion of glazing, or level of translucence to the roof” ends the exemption. Our page on conservatory roof insulation and the comparison of insulation kits with a new roof go further.

What can go wrong with a DIY roof kit

1. The frames cannot take the load. LABC says frames built for a polycarbonate roof “may only have sufficient reinforcement to carry that particular load”. It checks for steel with pilot holes or a magnet. Unreinforced frames need new windows or structural posts. Our guide to whether your conservatory can take a solid roof explains the checks.
2. The base is not adequate. Building control may want a trial hole. Foundations over drains, near tree roots or on filled ground need more thought.
3. Falls. Nobody should stand on the old roof, and access equipment is part of the job.
4. Missing tie bars. Ultraframe says tie bars stop the ridge deflecting and the frames rolling outwards, and if specified “they must be fitted”.
5. Leaks at the house wall. Guardian fixes its box gutter into brick, not mortar. Low-star reviews of one roof maker mention water getting in at box gutters and flashing years after fitting.
6. Condensation. Warm roofs rely on sealed vapour control; LABC inspectors look for tightly fixed insulation and screw fixings that do not bridge it.
7. No completion certificate. That can surface when you sell. In England, building control can take enforcement action for up to 10 years after completion.
8. No way back. Citizens Advice says you typically lose the cooling-off right on made-to-measure windows or a conservatory, and a made-to-measure roof kit is likely to be treated the same way.

Kit or fitted: how the costs compare

Branded kit makers rarely publish supply-only prices, so the figures below come from price guides, retailers and homeowners. The fitted prices are our typical ranges for a medium conservatory (about 4m x 3.5m); installers usually quote including VAT, but check.

Job	Supply-only or DIY figures we found	Typical fitted price, medium conservatory
New polycarbonate roof	£324 in materials for a lean-to re-sheet (one blog, 2016); £1,900 to £2,500 supply cost for a medium lean-to roof (HomeHow, 2024)	£2,700 to £5,200
Insulated ceiling or lining	£320 to £800 in materials (MyJobQuote); £500 to £1,000 for a DIY ceiling (forum reports)	£1,800 to £4,600
New glass roof	£2,000 to £2,700 supply cost for a medium lean-to, £4,200 to £5,300 for a medium Victorian (HomeHow, 2024)	£3,500 to £7,000
Tiled warm roof	£2,000 to £7,000 in materials for a 4m x 4m roof (MyJobQuote)	£7,400 to £12,100

A DIY job still carries the building control fee (around £200 to £400 in MyJobQuote’s guide), a skip (£120 to £300) and access equipment, plus a plasterer and electrician for a solid roof. Supply-only materials are also standard-rated for VAT. The tiled roof cost guide breaks down fitted prices by size and style. When you get quotes for a fitted roof, ask for the price split into roof, structural work, finishing and extras, so you can see exactly what a kit would and would not save.