Can you replace a conservatory roof yourself?

Yes, for some jobs. Re-sheeting a polycarbonate roof on its existing glazing bars is within reach of a competent DIYer, and homeowners have done it in a day. Fitting a solid or tiled roof yourself is another matter: building regulations apply whoever does the work, the structure has to be checked, and the leading systems are mostly sold through trained installers whose guarantees depend on fitting them.

The honest question is less “can I” than “what would I save”. MyJobQuote says labour makes up about 30% to 40% of a fitted roof price, so that is the most DIY can save before you add back fees, VAT, access equipment and the guarantee you give up.

DIY vs fitted: which jobs are realistic?

Re-sheeting polycarbonate is the realistic DIY job. An insulated ceiling is possible but raises building regulations questions, a new glass roof is hard, and a solid roof needs approval and structural checks whoever fits it. Here is how the jobs compare, with typical fitted prices alongside:

Job	Realistic as DIY?	Building control	Typical fitted price, medium conservatory
Re-sheet polycarbonate on the existing bars	Yes, for a competent DIYer with safe access	Normally exempt if like for like	£2,700 to £5,200
Internal insulated ceiling or lining	Some homeowners have	LABC’s reasoning suggests approval is likely to be needed	£1,800 to £4,600
New glass roof	Hard: usually needs a new roof frame and heavy glass units	Normally exempt if the conservatory still qualifies	£3,500 to £7,000
Lightweight tiled or solid roof	Some kits are sold for self-build; most systems go through installers	Always needs approval	£7,400 to £12,100

Fitted prices are our typical ranges for a medium conservatory (about 4m x 3.5m) in the common shapes; installers usually quote including VAT, but check. Our cost calculator gives a fitted figure for your size and style.

Re-sheeting a polycarbonate roof yourself

This is the DIY job with the best track record. One couple re-sheeted a lean-to in 25mm multiwall polycarbonate in “a full day” for two people, reused the existing flashing and spent £324 on materials. The outline of the job:

1. Set up safe access. Work from a scaffold, tower or proper roof ladders, never from the roof itself.
2. Remove the glazing bar caps and end caps. Ultraframe notes the top cap clips “are likely to be damaged” when caps come off, so buy replacements.
3. Lift out the old sheets and inspect the bars, rafters and seals. In one supplier case study the bars were replaced as a precaution because they were at least 10 years old.
4. Fit the new sheets with the flutes running downhill, solid tape along the top edge, breather tape along the bottom edge so moisture can escape, and end closures.
5. Refit the caps and seal the screw holes.

The DIY couple’s tips were to cut sheets no wider than 700mm and to use breather tape at the lowest point. Sheet prices are modest: Green Space quotes polycarbonate from around £35 per square metre in hardware stores, up to £50 and more. Our guide to polycarbonate thickness compares 16mm, 25mm and 35mm sheet before you buy.

If the sheets are only one part of the problem, for example the bars are damaged or the frames have moved, a re-sheet will not fix it, and a new polycarbonate roof from an installer may cost less than you expect.

Can you fit a tiled or solid roof yourself?

Possibly, with the right kit and skills. Ultraframe’s Ultraroof is supplied for self-build through DIY conservatory retailers, and one maker sells tiled roof kits direct to DIY customers without publishing a U-value, weight or certification. Guardian roofs are fitted by certified installers, SupaLite passes enquiries to approved installers, and Leka trains its own network.

A MoneySavingExpert poster noted that these roofs are manufactured as kits for assembly on site.

MyJobQuote puts the materials for a tiled conservatory roof at £2,000 to £7,000 for a medium (4m x 4m) conservatory. The job is long and technical. The makers’ installation guides include:

• Surveying the frames for steel reinforcement and the house wall for plumb and damp.
• Fixing a ring beam through the de-glazed window heads, and a wall plate into the house wall, at set centres.
• Fitting tie bars before any weight goes on: Leka calls this “essential”.
• Decking, foil-backed insulation with every joint taped as a vapour seal, and a breathable membrane to British Standard BS 5250.
• Battens, tiles, ridge and hips, flashings, gutters and soffits.
• First-fix wiring, insulated plasterboard and a plaster skim kept above 5°C until dry.

Leka’s installer guide puts the responsibility squarely on the fitter: “It is the sole responsibility of the installer to establish the structural suitability of the existing conservatory wall system.” If you fit it, that is you. Our guide to conservatory roof kits covers what the kits include, and what happens on installation day shows how installers sequence the work.

Building regulations still apply when you do it yourself

Replacing a glass or polycarbonate roof with a solid one needs a building regulations application, and the structure, foundations and new roof must satisfy building control. That does not change because you are fitting it. GOV.UK warns that the person doing the work can be prosecuted and fined for not complying, and that without approval “you will not have the certificates of compliance you may need when you want to sell your home”.

There are two routes. A full plans application gets a decision within five weeks, or two months with your consent. A building notice is “only for smaller projects”: you can start two days after submitting it, but you do not get formal approval in advance. Fees are set by each council. Rotherham, for example, charges £480 for the re-roof of a conservatory, and Durham £489 to renew or replace a roof structure. Branded installers often include this in their price.

If you skip it, putting it right later is harder: regularisation is only available from the council, may mean opening up the roof for inspection, and costs more (Rotherham charges £800). Lighting in the new ceiling is electrical work under Part P; use a registered electrician who can certify it. Our building regulations guide sets out the process in full.

DIY insulation kits and internal ceilings

Insulating under the existing roof is the most popular DIY idea after re-sheeting. MoneySavingExpert posters reported DIY insulated ceilings for around £500 to £1,000 that made the room more usable, though one said the savings would never repay the cost. Another suggested an office-style insulated suspended ceiling for under £1,000, against a £6,400 quote for a solid roof. MyJobQuote puts DIY roof insulation materials at £320 to £800 for a medium conservatory.

There are catches. Ultraframe warns that fixing battens and insulation under a glazed roof can damage the glazing bars, adds weight, traps heat, cuts light and uses untested materials. SuperFOIL, whose multifoil insulation some conservatory ceiling firms use, does not mention conservatories on its own product pages. And LABC’s guidance says that where work “significantly reduces the proportion of glazing, or level of translucence to the roof”, the conservatory can no longer be considered exempt, so an opaque ceiling is likely to need approval. See our comparison of insulation kits and a new roof.

Swapping polycarbonate for glass yourself

This is rarely a DIY job. One installer says most such projects need “an entirely new roof, designed specifically for glass” because glass is much heavier than polycarbonate, and a MoneySavingExpert contributor warned that the sealed units are a different thickness, much heavier and need different fittings, with snow load to consider. LABC notes that frames built for a polycarbonate roof may only be reinforced for that lighter load. Installers specify toughened safety glass for roofs: Ultraframe says all its roof glass is toughened, double glazed safety glass as standard.

What is the cheapest way to replace a conservatory roof?

New polycarbonate sheet on the existing bars is the cheapest replacement. Price guides start at about £1,900 to £2,000 fitted for a small conservatory, and one DIY lean-to re-sheet cost £324 in materials. The trade-off is a roof that is still hot, cold and noisy, with a lifespan guides put at around 10 to 15 years before it discolours.

Keeping the roof and adding solar control film, around £1,000 for an average conservatory according to Which?, is cheaper still but does not fix a failing roof. Our cost guides compare every option.

How long does it take to replace a conservatory roof?

A fitted polycarbonate roof can often be done in a day, and the DIY lean-to re-sheet above took two people a full day. Solid roofs take longer: makers quote 2 to 5 days on site, and one installer allows 5 to 10 working days for a tiled roof including plastering.

The costs DIY does not save

• VAT on materials. HMRC says energy-saving materials supplied without installation are always standard-rated, so DIY buyers pay 20%.
• Access. MyJobQuote puts scaffolding at £400 to £800 where needed.
• Waste. A skip is £120 to £300.
• Building control fees. Typically a few hundred pounds, and more if you regularise afterwards.
• Trades you still need. A registered electrician for the lighting, and often a plasterer.
• Protection. No installer workmanship guarantee, no insurance-backed guarantee and no deposit protection. Guardian’s consumer promise, for example, only covers roofs fitted by its Certified Installers.

When to hand it to an installer

Get it fitted if the roof is solid or tiled, if you are changing from polycarbonate to glass, if the frames or base show any movement, or if you cannot work safely at height. When you get quotes, ask each installer to price the same specification and to break out labour, materials, building control and access, so you can see exactly what doing it yourself would save.