Most single garage flat roof replacements cost 700–1,200. That’s the sensible middle. The full range runs from 500 for a basic felt re-cover to more than 4,500 for a pitched double garage in tiles, quite a spread, but the difference usually comes down to roof type, material choice, access, and what your roofer finds once the old covering comes off.
And that last part matters more than most guides admit. A 900 felt re-roof can turn into a 2,000 job if the old covering is hiding rotten decking, tired joists, or guttering that’s been quietly failing for years. This guide breaks down garage roof replacement costs by material and roof type, then flags the hidden extras that most cost guides skip past a bit too quickly.
Average Garage Roof Replacement Cost in 2026
A straightforward felt re-cover on a single garage might cost 700. Tile a double garage and you could be looking at 4,500. The UK average sits around 1,500, which is, as averages go, moderately useful.
| Material | Single garage (15–18 m²) | Double garage (28–36 m²) |
|---|---|---|
| Mineral felt | 500–900 | 800–1,500 |
| EPDM rubber | 700–1,200 | 1,100–2,000 |
| Tile/slate | 1,500–3,000 | 2,500–4,500 |
| Corrugated metal | 600–1,100 | 1,000–1,800 |
Double garage roof replacement costs usually run around 1.5–1.8× the price of a single garage. Not double, typically. Setup and access costs are partly fixed, so the larger area spreads them out a little. If your garage is an awkward size, and builders do seem to enjoy creating those, the per-m² rates below will give you a more accurate figure.
All figures include materials and labour for a straightforward like-for-like replacement. Structural repairs, asbestos removal, and scaffolding are covered separately, because those are where the bill tends to grow legs.
Garage Roof Replacement Cost Per m²
A standard single garage is roughly 3m × 5.5m, or 16–18 m². A double is usually about 5.5m × 5.5m, or 28–32 m². Measure external dimensions and add 0.3m overhang each side.
| Material | Cost per m² | Typical lifespan |
|---|---|---|
| Mineral felt | 20–35 | 10–15 years |
| Torch-on felt | 30–50 | 15–20 years |
| EPDM rubber | 40–65 | 25–30 years |
| GRP fibreglass | 50–75 | 25–30 years |
| Corrugated metal/fibre cement | 30–55 | 20–30 years |
| Tile/slate | 80–150 | 50+ years |
The lifespan trade-off is where cheap stops being simple. Mineral felt costs less upfront, but you may replace it twice in the time one EPDM membrane lasts. Over 30 years, a 700 felt roof replaced twice costs 2,100 total. A single 1,100 EPDM installation covers the same period for roughly half the lifetime spend. Annoying maths. Useful maths.
GRP fibreglass and EPDM rubber both suit flat garage roofs and both last around 25–30 years, but they’re not the same thing. EPDM is a single rubber sheet glued to the deck: faster to fit, more forgiving with movement, and usually the better budget choice for a standard detached garage. GRP is laid in resin and matting to form a rigid, seamless shell. Cleaner finish, better for foot traffic. But it’s fussier to install, can’t be laid in rain or below 5°C, and needs someone who actually knows how to laminate properly. EPDM generally costs 40–65 per m² installed. GRP usually sits at 50–75 per m².
Per-m² costs also fall as the roof area increases. A 16 m² single garage in EPDM works out at roughly 60/m². A 32 m² double drops to around 45/m². Same material, different spread of setup time.
Thinking about DIY? Material-only costs run 10–20 per m² for basic mineral felt and 25–40 per m² for EPDM rubber, before labour. But material cost isn’t the whole job, not even close. More on that below.
Flat vs Pitched Garage Roof Replacement Cost
Flat garage roof replacement costs 600–2,500. Pitched garage roof replacement costs 1,200–4,500. Most UK detached garages have flat roofs, so that’s where most replacement work sits.
Flat garage roofs
Simpler and faster. Most single-garage jobs take a day. Usually straightforward to strip, re-cover, and finish, and many don’t need scaffolding at all. A single flat garage roof replacement in felt costs 700–1,000. EPDM for the same size usually costs 1,000–1,400.
Pitched garage roofs
Cost more because the structure is more complex and scaffolding is more likely. Tile roofing on a pitched single garage costs 1,500–2,000. Metal sheets come in at around 1,100–1,500. And scaffolding alone adds 300–600 to most pitched jobs, so always ask whether it’s included in the quote or priced separately. That’s not a tiny footnote. That’s a “why has the invoice changed?” moment waiting to happen.
Pitched roofs are common on integral and semi-integral garages attached to the main house. The replacement garage roof cost for these sits toward the higher end, usually 3,000–4,500, because the new work has to tie into the existing house roof. That can mean new lead flashing, matching existing tile profiles, and possibly rebuilding or extending the ridge line. If the garage shares a roofline with the house, Building Control sign-off under Part L may also apply where insulation is affected.
What Drives the Garage Roof Replacement Cost Up?
The cost of garage roof replacement ranges from 500 for a straightforward flat re-cover with sound timbers in the Midlands, to 4,500 when asbestos, rotten joists, and London labour rates all decide to show up at once.
Access
A low, open flat roof on a detached garage is the cheapest setup. Tight access between houses, over fencing, or behind a garden wall can add 100–300 in labour and equipment.
Condition of the roof deck and timbers
Rotten OSB, plywood, or joists are often only visible once the old covering is stripped. Replacing them adds 200–800 depending on the extent. This is the most common source of unexpected cost increases. The roof looked fine. Until it didn’t.
Location
Regional labour rates vary considerably. Rough adjustments against the national average:
| Region | Approximate adjustment |
|---|---|
| London & South East | +20–30% |
| South West England | +5–10% |
| East of England | +5–15% |
| Midlands | Baseline |
| North of England | −10–20% |
| Wales | −10–20% |
| Scotland | −10–15% |
| Northern Ireland | −15–25% |
Time of year
Late autumn and winter bookings often attract rates around 10–15% lower than peak-season pricing. January and February are usually the best windows for more competitive quotes. Cold, yes. But roofers’ diaries are often quieter, and that works in your favour.
Hidden Costs That Catch Homeowners Out
Quotes don’t always include everything. These are the extras to check before you accept the cheapest number.
Rotten roof deck or joists. Old felt or asphalt can hide the state of the timber underneath. You won’t know for certain until the covering comes off. Budget a 200–500 contingency for decking replacement. Extensive joist damage can push that to 800.
Fascia and barge boards. These are often tired by the time the roof covering fails. Water gets behind them, rots the timber, and politely waits until the roofer points it out. Replacement adds 150–400 depending on material and length.
Guttering. Replacing a single garage gutter run costs 80–200. Doing it while the roofer is already on site is cheaper than booking a separate visit later.
Waste disposal. Some roofers quote skip hire separately. Confirm upfront. Old felt counts as mixed construction waste, and tipping fees are not imaginary just because they’re boring.
Lead or zinc flashing. If the garage sits against the house, failed flashing where the two structures meet needs replacing. Usually adds 80–200.
Emergency call-out premium. Urgent storm-damage work can add a 10–20% uplift to standard rates. Check your home insurance policy too, as storm damage to outbuildings is often covered, and your insurer may have approved roofers or claims rules worth following.
Ask your roofer to price these as provisional line items in the quote. It keeps everyone more honest, or at least less surprised.
Asbestos Garage Roof Replacement Cost
If your pre-1985 garage has grey or white corrugated panels, slightly rough texture, visible fibre strands at broken edges, budget an extra 500–1,500 for licensed asbestos removal before any new roof goes on.
The average asbestos garage roof removal and replacement cost for a single garage sits around 800–1,200 for removal alone, depending on garage size, sheet condition, and access. Combining asbestos removal with a new roof, expect to pay 1,200–3,000 for a single garage and up to 4,500 for a double, depending on replacement material.
Deteriorating asbestos needs more careful handling, with dampening sprays used during removal to reduce fibre release. The job usually takes one day. You don’t normally need to leave the property, but stay well clear of the work area. Sensible distance. Cup of tea indoors. That sort of thing.
Check that your tradesperson is on the HSE’s public register of licensed asbestos removal contractors and confirm they handle the required NNLW notification. If you’re unsure whether your roof contains asbestos, get a visual survey first, as many specialist firms offer this at low or no cost. Never disturb the material yourself. Even drilling one hole can release fibres.
DIY Garage Roof Replacement: Costs, Risks, and When to Call a Roofer
You can legally re-felt or re-rubber a detached flat garage roof yourself, and no Building Regulations approval is usually needed for a like-for-like swap. Material-only cost for a single garage felt re-roof is around 150–300. EPDM rubber kits cost 250–500. EPDM kits typically include adhesive and trims. Felt requires a gas torch, which costs 40–80 to hire, plus a sharp knife and a roller. Compared with 750–1,000 all-in for a professional felt job, the saving is roughly 300–700 in labour.
But. Incorrect installation of EPDM or torch-on felt often leads to water damage within months. A badly bonded seam or poor overlap lets water pool and creep through, and most manufacturer warranties on EPDM and GRP systems are void unless the product is installed by a registered or approved roofer.
Here’s what the job actually involves:
- Strip the old covering and remove all fixings and adhesive residue
- Inspect the deck and joists for rot; replace any damaged timber
- Lay new felt or EPDM with correct overlaps and bonding, ensuring edges are properly sealed
- Refit or replace fascia trims and check guttering alignment
A competent DIYer with the right tools can complete a standard single flat garage in 4–8 hours. Even on a low flat roof, use edge protection or a crawl board, as a fall from 2.5m can cause serious injury. For pitched roofs, asbestos, GRP fibreglass, or structural repairs, the skill and safety requirements outweigh the saving. Hire a professional.
How to Cut Garage Roof Replacement Costs
Get three quotes. Price variation between roofers for identical work is commonly 20–35%. Three quotes give you a real market range and make outliers easier to spot. This is still the most reliable cost-saving measure available.
Book in January or February. Spring and summer are peak season. Quieter winter order books mean some roofers offer 10–15% lower rates to keep work moving.
Combine work. If guttering, fascias, or flashing need attention, having one roofer handle everything in one visit reduces mobilisation cost. A separate callout later costs more.
Scrutinise the cheapest quote. A price well below the market range usually means missing line items. Common omissions include waste disposal, fascia replacement, and any allowance for decking repairs. If the average is 1,200 and one quote comes in at 650, ask what’s been left out. Because something probably has.
Planning Permission and Building Regulations
When permission is required
Changing roof type, such as flat to pitched, or significantly altering height or footprint can trigger permitted development rules and possibly a full planning application. The Planning Portal is the best starting point for checking your specific situation.
Building Regulations
- Unheated standalone garage, like-for-like re-cover: Building Regulations not required
- Garage conversion or adding insulation to a heated space: Part L applies, so budget 200–500 for insulation compliance and building control fees
Conservation areas and listed buildings
Stricter controls apply. Material changes, even superficially similar ones, may require conservation area consent or listed building consent before work begins. Always check with your local planning authority first.
Scotland and Northern Ireland
The guidance above applies mainly to England and Wales. Scotland operates under a separate planning framework, so check the Scottish Government’s planning pages. Northern Ireland has its own rules administered by local councils, with different exemptions and notification requirements.
Even where no formal approval is required, keep records: dated photos, receipts, material specifications. Conveyancing solicitors routinely ask for evidence of roofing work during property sales. Missing documentation can slow a sale, or derail it entirely if the buyer is already nervous.
What a Garage Roof Replacement Quote Should Include
A proper quote should specify:
- Full scope of work, including strip-off and preparation
- Material brand, product name, thickness, and warranty terms
- Labour cost confirmed as included
- Waste disposal stated as included or priced separately
- Scaffolding included or priced separately
- A day-rate contingency for structural repairs found on strip-off
- Expected start and completion dates
Confirm public liability insurance of at least 1 million and ask to see a current certificate. For asbestos work, use the HSE’s licensed contractor register.
A deposit of 25–30% is reasonable. Hold back at least 10% until any snagging is resolved and you’re satisfied with the finished work. A roofer asking for full payment upfront before the job starts is a roofer worth pausing on.
Specialist local flat-roofers often provide better value on garage roof replacements than larger general roofing firms. Still, get three quotes minimum. Compare scope, not just price.