The short answer
You may do some of the work yourself, but replacing a whole conservatory roof is rarely a safe or simple DIY job. A solid roof needs a Building Regulations application, the frame has to be assessed for the extra load, and working on a fragile roof is a real fall risk. A DIY roof built without consent can also cause trouble when you sell.
Where maintenance ends and building work begins
Replacing a cracked polycarbonate sheet with a matching one is maintenance, and many owners manage it. Fitting a new solid roof is a different category. Homebuilding and Renovating treats a solid roof on a conservatory as material alteration under the Building Regulations, so a building control application follows. The Planning Portal adds that any new roof has to be safe in structure, economical with energy and properly aired.
Doing the work yourself does not remove those duties. The owner is answerable for the application, the inspections and the finished result, whoever lifts the tiles.
Insurers and mortgage lenders may also want to know that structural work met the rules, and a roof you built yourself will be asked about when you come to sell or remortgage, so keep every receipt, photograph and inspection record.
The frame has to carry what you put on it
Tiles, insulation and plasterboard weigh far more than glass or polycarbonate. Homebuilding and Renovating warns that frames designed for lightweight roofs are being asked to carry more. If the frame, cill and base were built for light glazing, they may need reinforcing, and MyBuilder quotes structural reinforcement at £500 to £2,000 where it is required.
Judging that by eye is hard. Sagging rafters, bowed frames, cracks at the wall junction or a door that sticks could point to movement, none of which is obvious from the garden. Our guide to Building Regulations for a solid conservatory roof explains what is checked.
Weight is not only about the roof. The new covering also bears on the cill, the base walls and the foundations beneath, and a footing that has moved slightly under a light roof can show it badly under a heavy one.
Working on a roof that may not hold you
An old conservatory roof is often too weak to stand on. Polycarbonate and glass can give way, and the drop into the room below can be serious. Scaffold at the eaves and wall, safe access onto the roof and edge protection are normal for professional crews. MyBuilder quotes scaffold at around £700 to £1,300 on a whole house re-roof; a conservatory should cost less, but the need for safe access is the same.
Lifting long rafters, tiles and insulation boards takes more than one pair of hands. If the weather turns while the roof is open, the room and the house wall are exposed. Professionals plan to close in each section the same day. A single wet night on an open roof can undo a weekend's work.
It is tempting to count the labour saved. A roofer's day rate is £250 to £300 (MyBuilder, 2026), and disposal is quoted at £100 to £1,000 on a whole house re-roof. Those lines are what DIY seems to save. Set them against the cost of hiring scaffold, buying the wrong fixings, carting the old panels to the tip and doing the work twice if an inspector asks you to open it up again.
Details that fail months later
A DIY roof can look fine and still fail in the details. A new roof in an existing home must reach a U-value of 0.15 under Part L 2021 Table 4.2, and the build-up needs a vapour control layer, ventilation and a flashing at the house wall. Gaps in any of these let in moisture or draughts months or years later, when the cause is hardest to trace.
Where the conservatory is attached to an older house, matching the roof to the building adds another layer of thought; see matching a conservatory roof to your house. The warmth side is covered in will a solid roof cut my heating bills. A roof that skips these steps will not give the comfort that justified the cost.
Old polycarbonate and glass are awkward waste too. Sheets are long, sharp at the edges and heavy in quantity, and a car or small trailer will not take them in one trip. Tipping rules differ from site to site, so ask before you load up.
Selling later, and what we offer instead
Buyers' solicitors ask for paperwork on structural changes. If a solid roof went on without an application, you may face retrospective regularisation or a lower price. A building inspector can see the stages as they are built when the application is made at the start, which is far less awkward than doing it afterwards.
Our approach is to survey, photograph your roof and frame, send a written quote, explain consent and deal with the Building Regulations paperwork where the job requires it. If you still want to take on a part, such as decorating, tell us at the survey. See our conservatory roof replacement page for the process.
Jobs that suit an owner and jobs that do not
Some tasks are fair game for a capable owner: cleaning the gutters and glazing, resealing a loose cover strip, painting the inside of the frame, or fitting blinds. Each is low-risk when done from a stable platform, and none changes the structure.
Others belong with a professional crew. Stripping the old roof, altering the frame, forming the junction with the house wall, laying insulation and building a solid roof are all structural or weatherproofing work, and each stage hides the one before it. Once the plaster is up, nobody can see whether the vapour layer was taped. If you are unsure where a job sits, send us a photograph and we will say.