EPDM garage roofs
Is EPDM rubber a good choice for a garage roof?
EPDM suits a flat garage roof with a sound deck and proper falls. The published figures, and the points that decide whether it suits yours, follow.
The short answer
Yes, for a flat garage roof whose boards are sound and whose falls drain properly. EPDM is a rubber membrane, and HomeBuilding gives it 25 to 30 years where Less says it typically lasts 30 to 50 years. Which? Trusted Traders price rubber on a typical single garage at £1,950 to £4,000 with new boards, excluding VAT (November 2025). The membrane is only as good as the deck and the drainage under it.
4 min read · Part of Garage roofs
EPDM in numbers
The two lifespan sources disagree, so both are named instead of one being picked. Read the spread, not a single number.
| Source | Figure |
|---|---|
| HomeBuilding | 25 to 30 years |
| Less | "typically lasts 30 to 50 years" |
| Which? Trusted Traders | £1,950 to £4,000, single garage, new boards |
| MyJobQuote | Around £60 per square metre; average rubber roof £1,050 fully installed |
Which? gathered its prices in November 2025 from a survey of 11 Trusted Traders. Its range is for a typical single garage of 6m x 3m and excludes VAT, and Which? flags the South East, where Kent and East Sussex both sit, as the part of the country likely to land towards the top of its scale. MyJobQuote's figures carry no VAT basis, and its per-square-metre rate is never multiplied up into a total here.
No figure in the table is a price for your garage. Your own total arrives in writing after a survey, as a single price. Lifespans are typical figures, never promises, and a well-made roof can land at either end of them.
Why the deck and the falls decide the result
A rubber sheet lies on whatever is beneath it. Soft or damp boards stay soft or damp under a new membrane, so the deck is checked before any covering is chosen. Which? prices rubber "with new boards" for that reason: the boards are a separate job from the sheet laid over them.
Water also has to leave the roof. BS 6229:2025 is current for membrane flat roofs, and NFRC reports that it sets a minimum 1:80 finished fall for general roof areas and internal gutters. IKO adds that to reach 1:80 once built, the roof should be designed for a fall of 1:40.
On a garage that already holds standing water, the survey looks at whether the fall can be corrected at the deck. A membrane laid over a roof that ponds will still pond. The outlet or gutter it drains to needs to be sound as well, and Brett Martin, a manufacturer, advises a gutter fall of 1 mm for every 600 mm towards the outlet. Clear the outlet and check the gutter for blockage before any membrane work starts, because a rubber roof that cannot shed water fast enough will pond. Our page on why a garage roof leaks covers the signs.
Where another covering suits better
EPDM answers a flat or near-flat roof. A garage with a pitched roof of old cement sheets is a different case: the choice there runs through sheets, tiles or a new flat roof built to falls, and the survey says which the structure can take. HSE's A14 guidance describes AC roofs as always fragile, so nobody should climb onto such a roof to judge it.
Compare the three flat coverings on the same page of facts:
- Felt: HomeBuilding gives 10 to 15 years and Less gives 10 to 20 years.
- GRP: HomeBuilding gives 25 to 30 years and Less gives 25 to 40 years.
- EPDM: HomeBuilding gives 25 to 30 years and Less gives 30 to 50 years.
Felt costs less up front and lasts a shorter time, which can suit a garage with a short future. GRP and EPDM sit close together on the HomeBuilding figures, and the Less figures put EPDM ahead. For a garage you intend to keep, our guide to the best material for a garage roof sets out the full comparison, covering by covering.
Repairing EPDM and what the survey checks
Checkatrade's repair rates are £120 to £170 per m² for EPDM rubber repairs, and £130 to £180 per m² for GRP repairs. Those rates apply to areas of up to 3 m² at most, and neither VAT nor access equipment is in them, so they guide a small patch and never a whole roof. They are never multiplied into a total.
At survey we check:
- the boards, from above and from inside the garage
- where water stands after rain
- the edges, upstands and drips where a membrane finishes
- the outlet and gutter it drains to
Then comes the verdict, given plainly with photos of what we found: a repair where the membrane and deck are sound, or a new membrane where the sheet has run its course. In that case the old sheet is stripped and the boards are looked at again before any new rubber goes down, because a fresh membrane cannot make up for a weak deck. The repair or replace guide shows how that verdict is reached, and everything on garage roofs sits under our garage roofs hub.
More questions
Does an EPDM garage roof need building regulations approval?
Replacing a roof covering is checked against the Planning Portal's re-roofing test: not normally, under 25 per cent of the building envelope and under 50 per cent of the roof. Dover District Council addresses follow the council's stricter wording, and building control can confirm the route for your address.
Can EPDM be patched and left in place?
Where the membrane and deck are sound, a local repair is a fair answer, and Checkatrade gives EPDM repairs at £120 to £170 per m² for areas up to 3 m². A membrane at the end of its life, or boards that have gone soft, needs more than a patch.
Tell us what's wrong with the roof.
You'll get one written total price.