A garage roof is a small job with a wide spread of prices. The covering is one reason. The sheet material underneath is another, and so is whether the old roof is felt, tiles or asbestos cement. Access matters too, because a garage at the end of a narrow Stroud lane or behind a terrace is harder to serve than one on a flat drive.
This guide sets out typical national ranges from published cost guides, dated and named, so you can read them before anyone visits. They are not Supreme Roofing prices. Once we have surveyed and photographed your roof, the written quote covers access, stripping, deck repairs, covering, edge trims, waste and making good. Where a garage roof needs a lengthier read on one point, the guide links on: the garage roof materials guide compares coverings, and the asbestos garage roof guide explains the HSE position. For the whole service, start at garage roof replacement.
What goes into a garage roof price
Every garage roof quote, large or small, is the sum of a handful of parts. Knowing them makes the published ranges easier to use, because a range is simply what those lines add up to across a lot of different garages.
What a quote covers
Start with access: ladders, a scaffold tower or full scaffold, depending on the height of the eaves and what stands in the way. Then comes stripping, which means taking the old covering off and, on a flat roof, checking the boards or sheets underneath. Next is the deck, the layer that carries the covering. A flat garage roof is usually timber boards or sheets on joists, and wet or split timber has to be renewed before anything new goes on. Then the covering itself, the edge details (the trims, drips and upstands that finish the roof at its borders), and finally waste removal and making good.
What pushes the figure up
Four factors do the damage. One is the size of the roof. Another is how much of the deck has to be replaced, which only shows once the old covering is off, so we photograph what we find and talk it through before extra boards are cut. A third is the covering you choose. The last is the old material: asbestos cement sheet follows its own rules and its own price band, covered later in this guide.
A published range tells you whether a figure is plausible. Only a survey of your garage, with its own deck and access, tells you what yours costs.
Single and double flat garage roofs
MyBuilder's garage roof replacement guide, updated on 21 August 2026, gives three headline bands. A single flat garage roof typically costs £700 to £1,000. A double flat garage roof typically costs £900 to £1,400. A pitched garage roof typically costs £2,500 to £4,500.
| Garage roof | Typical national range | Source |
|---|---|---|
| Single flat garage | £700 to £1,000 | MyBuilder, updated 21 August 2026 |
| Double flat garage | £900 to £1,400 | MyBuilder, updated 21 August 2026 |
| Pitched garage | £2,500 to £4,500 | MyBuilder, updated 21 August 2026 |
Why a double garage costs only a little more
A double garage has roughly twice the roof area of a single, yet its range sits only a few hundred pounds higher at both ends. The reason is that some of the work does not double. Access is set up once, the edge trims are mostly the same length per side, and the site clearance is one visit. The covering and the deck do scale with area, so the gap widens when the deck is in poor condition.
Fall and drainage
No flat roof is actually level. BS 6229 guidance, as quoted by IKO and Rockwool, is to design for a 1:40 fall so the built roof still drains at 1:80 at the least. A garage whose roof ponds after rain may have lost its fall because the deck has sagged. Putting that right is included in the quote. Our garage roof materials guide covers what each covering needs from the deck.
Price per square metre by covering
Because a garage is small, a per-metre figure is a useful cross-check on the total. MyBuilder's flat roof cost guide, updated 21 August 2026, gives these typical ranges per square metre for a replacement covering.
| Replacement covering | Typical national range per m² |
|---|---|
| Bitumen felt | £70 to £100 |
| EPDM | £90 to £130 |
| GRP (fibreglass) | £95 to £150 |
| PVC single-ply | £95 to £140 |
| Lead | £150 to £200 and above |
EPDM is a synthetic rubber sheet that goes down as one piece. GRP is fibreglass cloth soaked in resin and cured on the deck. Felt means layers of bitumen-coated sheet, often torched or stuck down. Each carries a different life: built-up felt is typically given 10 to 20 years, EPDM 20 to 30 years or more, and GRP 25 to 40 years, according to the guides we draw on, with real life depending on workmanship, exposure and upkeep.
Using the numbers on your own roof
Multiply the roof area by the per-metre range for the covering you like, then compare with the whole-roof bands above. The per-metre figure covers the covering alone, so expect the total to sit higher once the deck, trims, waste and access are added. The fuller trade-offs between these coverings, including which one suits a garage with overhanging trees, are in the materials comparison.
Pitched garage roofs cost more, and for good reason
The MyBuilder band for a pitched garage roof, £2,500 to £4,500, is several times the flat-roof band. The structure explains it. A pitched roof has two slopes, a ridge (the top edge, where the two slopes join), verges (the sloped edges beside the gable walls) and usually battens and underlay under the covering. The covering is often concrete or clay tile, or slate, and it is laid course by course rather than rolled out in one sheet.
Tile weight and the roof structure
Garage roof timbers are often lighter than those of the house. Planning Portal guidance is that a new covering which increases the weight by 15 per cent or more brings Building Regulations approval into play, and the Approved Document A wording is similar. Swapping a lightweight sheet roof for concrete tiles can pass that point, so a structural check comes before the quote is fixed. Your building control body decides what applies.
Tile and slate life
MyBuilder gives concrete tiles 30 to 50 years and clay tiles 40 to 60 years, while Marley quotes a BRE minimum for clay of 60 years. Those figures assume sound battens and fixings, and they are typical ranges, never promises. A garage roof that is already tiled is normally re-covered in tiles of a matching type, so the roofline stays as it is. If your roof is pitched and you want to know what is involved, the garage roof replacement hub lists every guide on the topic.
Asbestos cement sheet: the removal bands
Some older garages have corrugated sheets of asbestos cement. HSE guidance does not require a licence to lift sound sheets out carefully; it calls that non-licensed work. Where sheets are substantially broken up, HSE classes it as notifiable non-licensed work, and notice goes to the enforcing authority before the job begins. Our asbestos garage roofs guide covers the full HSE position.
MyBuilder's asbestos removal guide, updated 21 August 2026, gives these national ranges for a garage roof specifically.
| Asbestos garage roof | Typical removal range |
|---|---|
| Single garage | £350 to £1,295 |
| Double garage | £650 to £1,800 |
The same guide says asbestos removal in general averages about £2,000, at a starting rate of £50 per m². It also lists an asbestos survey at around £50, and a fuller survey at £200 to £245. What a test costs and what it tells you is covered in our answer on asbestos test costs.
The replacement is extra work
Removal ranges cover taking the sheets off. They do not include the new roof. After removal, the garage needs a new covering, often a flat roof with a new deck or a pitched roof on new timbers, and those lines come from the earlier tables. That is why an asbestos garage roof job has two parts in the written quote: the removal and the replacement.
Disposal, access and scaffold on valley-side sites
Waste is a real cost on any strip-and-replace job. MyBuilder's new roof guide, updated 21 August 2026, puts disposal for a full re-roof at £100 to £1,000, a range that scales with the volume of material. On a garage the figure sits at the bottom of that range for felt and boards, and higher for heavy tile or sheet. Asbestos waste is handled differently from ordinary rubble, so the quote allows for it. The asbestos garage roofs guide explains why.
Scaffold or tower
Checkatrade's roof replacement guide, updated October 2026, gives scaffold for a whole-house re-roof as £700 to £1,300, and MyBuilder at about £1,125. A low garage seldom needs a full house scaffold, and a ladder or a tower may be enough. We say which in the quote, based on the eaves height we measure at the survey.
Getting materials to a Stroud garage
Garages in the Five Valleys often sit at the back of a terraced plot, up a steep drive, or down a lane where no lorry can pull up. Carrying every board, roll and sheet by hand costs labour time, and so does skipping waste on a street with no space for a skip. We note the route to your garage at the survey and put it in the quote, instead of discovering it when the crew turns up. Roofs close to a boundary may also need a neighbour's agreement to put a ladder or tower on their side, which is worth raising early.
Reading the written quote, VAT and consent
Our written quote follows once the survey is in and covers access, strip, deck repairs, covering, trims, waste and making good. For an asbestos roof, the removal and the new roof are two jobs, and the quote covers both. The 10-year workmanship guarantee is set out in writing alongside it, and the waste is carted off and the site left clear.
VAT
Roofing work on an existing building is normally standard-rated at 20 per cent under HMRC's VAT Notice 708, and your quote shows the VAT. The national ranges above are best read as typical figures from third-party guides, and a few are expressly ex VAT, so compare with a VAT-inclusive quote carefully.
Building Regulations
A like-for-like garage re-roof that touches under 25% of the building envelope and under 50% of the roof is not normally something that needs Building Regulations approval. Above those limits, or with a heavier covering, approval applies. On a heated or attached garage that forms part of the dwelling, replacing a flat roof membrane can bring a thermal upgrade under Part L, so ask your building control body whether your garage is caught. Should the work be notifiable, we explain the consent and file the notification.
Ask for the quote to cover both the removal and the new roof. Then you can compare it with the published bands above and with any other quote you receive.