Question answered
What is the cheapest way to replace a conservatory roof?
The short answer
The lowest-cost way to replace a conservatory roof is usually polycarbonate, which MyBuilder puts at £2,000 to £5,000 against £3,000 to £8,000 for glass and £5,000 to £10,000 for solid (guide updated 21 August 2026). Polycarbonate also has the shortest published life, around 10 to 15 years, so the sum you save now may be spent again sooner.
The lowest price on the quote and the lowest cost over the life of the roof are not always the same roof. Here are the options by budget, with published UK ranges.
Three roof types and their typical UK ranges
MyBuilder's conservatory roof guide, updated 21 August 2026, puts the average conservatory roof replacement at around £4,500, with a wider spread of £2,000 to £10,000 or more. Split by material, polycarbonate is £2,000 to £5,000, glass £3,000 to £8,000 and solid £5,000 to £10,000. These are typical UK figures from a national guide rather than a Watertight price list, and your own figure turns on size, shape and the frame underneath.
Polycarbonate is a lightweight twin-wall or multi-wall plastic sheet. Glass is a sealed double-glazed unit, normally with a solar-control coating. A solid roof is a built-up insulated structure, often tiled, that replaces the glazing altogether.
The order of the three is clear enough, which is why polycarbonate wins on the quote. The harder question is what each one costs once it has done its job and has to be replaced, which the next sections look at. Your own figure arrives as a single written price once the roof has been surveyed.
Lowest price now against lowest cost over the years
Lifespan changes the sum. HomeBuilding gives a typical lifespan for a polycarbonate conservatory roof of 10 years, and the Eco Experts say it lasts about 10 to 15. Spread across that range, a polycarbonate roof at £2,000 to £5,000 is a cost every decade or so.
Glass and solid roofs cost more up front, and the life of each depends on the glazing unit, the frame and the seals, so the supplier's stated figures matter. Ask each supplier for the stated life of the system, the frame and the seals separately, and for the manufacturer warranty terms. A warranty is a promise about faults, not a forecast of how long the roof lasts.
Put the question the other way round: how long do you expect to stay in the house, and how much will you use the room? A conservatory kept as a cool store for plants needs less than one used as a year-round dining room. The roof you choose should reflect the use as well as the budget.
Lower-cost routes that do not replace the roof
Replacement is not always the answer. Many conservatory roofs that leak or fog up have a failed seal, a cracked panel or a blocked gutter, and fixing the fault costs less than a new roof. Our page on what a conservatory roof costs sets the figures in context.
If the sheets are tired but the frame is sound, replacing the polycarbonate panels and glazing bars can restore a roof for the lower end of the range. A cracked or yellowed panel can sometimes be replaced alone. Our recommendation is whichever job stops the problem with the least work, and we say which after looking.
Be wary of surface fixes that hide a worn roof. Sealant over a failed joint can trap water and make the real fault harder to find. A repair should be traced to where the water gets in, not coated over, and photographs taken at the survey show which case applies to you.
What can add to the price
The roof sheet is only part of the bill. MyBuilder says structural reinforcement can add £500 to £2,000, and that matters when moving to a heavier glass or solid roof, because the old frame may not carry it. Our page on the conservatory dwarf wall covers the supporting walls.
Access and scaffolding also count. Check whether a quote includes both, and whether it includes VAT, because a figure that leaves them out will rise. Stripping and carting away the old roof and tidying the abutment against the house wall belong in the price too.
Putting a solid roof where the glazing was means a building control application, since HomeBuilding classes the swap as material alteration. That adds a step, so it belongs in the plan. A glass or polycarbonate replacement is a different question, which the Planning Portal says is usually permitted development within limits.
Choosing a roof for the budget you have
Start with the problem. If the room is too hot in summer and cold in winter, a solid or high-performance glass roof may suit the use better than a cheap sheet. If you only need a dry, light room, polycarbonate can be the right job, not a compromise.
Then set the budget against the horizon. For a house you will leave in a few years, a modest replacement that keeps the room usable is sensible. For one you will keep, the higher outlay may spread over a longer life. Neither is a mistake; the mistake is choosing without knowing the trade-off.
Be careful with grants. Most conservatory roof replacements will not be covered, and our page on whether you can get a grant to replace a conservatory roof explains where the limits lie. Our pricing is good and fair, which you can judge from the written quote. The wider range of conservatory roof replacement options is set out on the hub page.
Comparing conservatory roof options: two more questions
Is replacing just the polycarbonate sheets worth doing?
It can be, when the frame is sound and the problem is tired or cracked sheets. A survey checks the glazing bars, seals and gutter first, because new sheets on a failed frame leak again. The result is a smaller job than a full replacement, and it is the sort of right-sized fix we recommend.
Does a solid roof always cost more than glass?
MyBuilder's ranges put solid at £5,000 to £10,000 and glass at £3,000 to £8,000, so solid usually costs more, although the ranges overlap. Frame reinforcement, size and finish can move either figure, and the written quote after the survey fixes the number for your conservatory.
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