How much does a garage roof replacement cost?
Real 2026 prices for felt, EPDM, GRP and pitched garage roofs, plus what to do about asbestos cement. Prices updated July 2026.
Garage roofs are the most replaced roofs in the country: they are small, cheaply built in the first place, and left to fail because nothing precious sits underneath. The price swings mainly on the covering you choose and whether the old roof turns out to be asbestos cement. This guide covers both, plus the building regs position. For a figure tailored to your own garage, use our roof cost calculator.
Garage roof costs (2026)
| Job | Typical cost |
|---|---|
| Patch repair | £100 – £300 |
| Joist/timber repair (each) | £150 – £400 |
| Single garage re-roof, felt | £1,400 – £2,000 |
| Single garage, EPDM | £1,600 – £2,600 |
| Single garage, GRP | £1,900 – £3,000 |
| Double garage | Roughly 1.8x single garage prices |
| Pitched garage re-tile | £2,000 – £4,500 |
| Asbestos cement roof removal + replacement | £1,500 – £3,500 |
These figures match our flat roof cost guide, which compares felt, EPDM and GRP in full. A double garage does not cost double a single: access is set up once and the crew is already there, which is where the roughly 1.8x rule comes from.
Which material for a garage roof?
For most garages, EPDM rubber is the sweet spot: it costs a few hundred pounds more than felt but lasts far longer, comes in a single seamless sheet at garage sizes, and needs no flame to install. Felt at £1,400 to £2,000 fitted remains the budget route and is fine where upfront cost rules. GRP fibreglass earns its premium when the roof works for a living: used as a terrace, walked on to reach windows, or over a workshop where a rigid, tough surface pays off, because GRP handles foot traffic better than either alternative. Pitched garage roofs are simply small tiling jobs and are re-tiled like the main house. A specialist garage roofer will price all the options against your actual roof.
The asbestos cement issue
If your garage was built before the 1990s and has corrugated grey cement sheets on top, treat them as asbestos cement until proven otherwise: it was the standard garage roof of the era. Left alone and intact it is low risk, but never break, drill, cut or pressure-wash it, because damage is what releases the fibres. Removal and disposal must be done by a licensed contractor, which is why the asbestos line in the table runs £1,500 to £3,500 including replacement. Read the asbestos roof guide before getting quotes, and make sure any quote states the disposal route in writing.
Do you need building regs approval?
Usually not for a detached garage: freestanding garages under 30m² are generally exempt from building regulations, and that covers most single and many double garages. An attached garage is different, because it counts as part of the house, so re-roofing it follows the same rules as the main roof. The building regulations guide explains where the lines sit and who signs what off.
How a garage roof replacement works
A garage roof replacement is a strip and re-cover, not a rebuild. The old covering comes off, the timber deck underneath is inspected, any soft or rotten boards are replaced, and the new system goes on top. The deck is the part that moves the price, because nobody can see it until the old roof is off.
A good quote says in writing what deck replacement costs per board or per square metre, so a bad deck becomes a known number rather than an argument on day two. Ask for that line before you accept anything.
Garage roof cost by size
Garage roofs are priced by area, and almost every UK garage falls into one of three sizes. Measure the roof, not the floor: the overhang adds a metre or so.
| Garage | Roof area | Felt | EPDM rubber | GRP fibreglass |
|---|---|---|---|---|
| Single garage | 14 – 16m² | £1,400 – £2,000 | £1,600 – £2,600 | £1,900 – £3,000 |
| Double garage | 26 – 30m² | £2,200 – £3,200 | £2,600 – £4,200 | £3,000 – £4,800 |
| Triple or outbuilding | 40m²+ | £3,200 – £4,600 | £3,800 – £5,800 | £4,400 – £6,500 |
Two extras turn up on most quotes. Replacing a soft or rotten deck adds £25 to £45 per m², so £350 to £650 on a single garage, and new fascia or trim adds £150 to £400. A quote that ignores the deck is guessing, because nobody can see it until the old covering is off. Ask for the deck rate in writing before you accept.
Repair or replace your garage roof?
Repair while the covering is sound and the failure is in one place: a split at an upstand, a blister, a lifted edge. Expect £100 to £400 and a few years. Replace once any of these is true:
- The felt is cracking across the whole surface, not just at a seam
- The deck feels soft underfoot or the ceiling inside is stained in more than one spot
- You have paid for two repairs in three years
- The covering is felt and over 15 years old, or asbestos cement of any age
On a single garage the gap between a £300 repair and a £1,900 EPDM replacement closes fast once you are paying twice. EPDM at £1,600 to £2,600 for 30 to 50 years works out cheaper per year than felt at £1,400 to £2,000 for 10 to 20.
How long does a garage roof take?
A single garage in felt or EPDM is a one-day job for two fitters. GRP fibreglass is one to two days because the resin has to cure and it cannot be laid in rain or in the cold. Add a day if the deck is being replaced, and two to three days for a pitched garage re-tile with scaffolding. Nobody should need a week for a garage.
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