How much does a flat roof replacement cost in the UK?
A flat roof replacement costs £60 to £130 in the UK, typically around £90 per m². What moves the price most is the material, so a simpler job sits near the bottom of that range and a larger or higher-spec one near the top. Prices reviewed June 2026.
A flat roof replacement is priced per square metre, and the material is the biggest factor. Felt is the cheapest, EPDM rubber sits in the middle, and GRP fibreglass is the most expensive. Access, the state of the timber deck underneath, and roof size also move the price.
Flat roof replacement cost calculator
Use the calculator to price your flat roof replacement in 2026. Adjust the options and area for a UK cost range. Nothing is sent anywhere.
To price the whole job, use the roof replacement cost calculator.
Flat roof replacement cost breakdown
Typical flat roof replacement costs, by the unit:
| What | Typical UK cost |
|---|---|
| Per m², supplied and fitted | £60 to £130 per m² |
| + Two-storey roof needing scaffolding | add £15 to £35 per m² |
| + New timber deck needed | add £20 to £45 per m² |
| 10 m² | £600 to £1,300 |
| 20 m² (typical) | £1,200 to £2,600 |
| 40 m² | £2,400 to £5,200 |
What's included in the price?
Typical flat roof replacement prices include:
- Stripping and disposing of the old covering
- The new membrane and a new timber deck where needed
- New edge trims, drips and flashings
- Labour and standard ground-level access
What changes the price?
The things that move flat roof replacement prices most:
The material: felt, EPDM rubber or GRP fibreglass
Whether the deck or firrings need replacing
Roof size and how the roof is reached
Scaffolding or an access tower on a two-storey roof
How the price is built up
Most of the price is the per square metre rate for tearing off the old covering and fitting the new one, which runs from £60 to £130 and sits around £90 on a typical job. On the standard 20 square metre roof that puts the core work near £1,800, with felt at the bottom of the band and GRP fibreglass or a thicker EPDM rubber system towards the top. Two things push a job higher. A two-storey roof needs scaffolding or an access tower, adding £15 to £35 per square metre, and a rotten deck or firrings that must be replaced adds £20 to £45 per square metre for new timber before the covering goes down. Labour is usually the larger share on a flat roof, roughly 55 to 65 percent of the total, with the covering, timber and fixings making up the rest. The split tilts further towards labour once scaffolding or a full deck strip is involved.
Ways to keep the cost down
- Choosing felt over GRP fibreglass or a premium EPDM rubber system keeps the covering near the £60 floor rather than the £130 top, so on a 20 square metre roof that is roughly £1,200 against £2,600.
- Only replace the deck and firrings if they are actually rotten. Sound timber avoids the £20 to £45 per square metre new deck charge, so ask the roofer to lift and check before you agree to a full strip.
- Book work outside the busy summer and autumn stretch. Winter and early spring are quieter for roofers, so quotes tend to soften when they are chasing work.
- A single-storey roof avoids the £15 to £35 per square metre scaffolding charge that a two-storey job carries, so make sure your quote is not padded with access costs you do not need.
Does where you live change the cost?
In London, a flat roof replacement typically costs around £120 per m², about 30% above the UK average of £90. In the North, Scotland and Wales the guide figure is nearer £85.
| Region | From | Typical | Up to |
|---|---|---|---|
| Midlands / East (UK average) | £60 | £90 | £130 |
| London | £80 | £120 | £170 |
| South East / South West | £70 | £100 | £150 |
| North / Scotland / Wales | £55 | £85 | £120 |
Guide prices per m², scaled with the same regional multipliers as the calculator. Not quotes.
Flat roof replacement cost in major UK cities
| City | From | Typical | Up to |
|---|---|---|---|
| Belfast | £50 | £75 | £110 |
| Birmingham | £60 | £90 | £130 |
| Bristol | £65 | £100 | £140 |
| Cardiff | £55 | £85 | £120 |
| Edinburgh | £60 | £90 | £130 |
| Glasgow | £55 | £80 | £120 |
| Leeds | £55 | £85 | £120 |
| Liverpool | £55 | £85 | £120 |
| London | £80 | £120 | £170 |
| Manchester | £60 | £85 | £120 |
| Newcastle | £55 | £80 | £120 |
| Sheffield | £55 | £85 | £120 |
City guide estimates, scaled by local labour costs. Indicative averages for flat roof replacement, not quotes.
Nearly all of the regional gap is labour.
Common questions
How much does it cost to replace a flat roof on a garage?
A single garage of around 15m² typically costs £1,200 to £1,800 in felt, or £1,650 to £2,700 for EPDM rubber or GRP fibreglass, supplied and fitted.
How much is an EPDM rubber flat roof per square metre?
EPDM rubber usually costs £70 to £110 per m² fitted, so a 20m² roof works out at roughly £1,400 to £2,200.
How often do flat roofs need replacing?
Traditional felt lasts 15 to 20 years, GRP fibreglass 25 to 30, and EPDM rubber 30 or more. If your felt roof is on its second decade and showing bubbles or cracking, budget for replacement rather than another patch: at £60 to £130 per m² a garage roof is often a £1,200 to £2,600 job.
Is a leaking flat roof covered by home insurance?
Storm damage usually is: a roof that was sound until a specific event. Gradual deterioration is not, and insurers treat a worn-out felt roof as a maintenance issue. That distinction is why it pays to photograph your roof condition periodically and fix small defects before winter.
Is it better to repair or replace a flat roof?
Replace it once the deck is soft or the covering has failed across most of the roof, because patch repairs on a worn surface rarely last. A full replacement at £60 to £130 per square metre resets the roof for years, whereas a repair only buys time on a covering that is near the end of its life. If the damage is one small area and the timber underneath is sound, a repair is the cheaper and sensible choice.
How easy is it to replace a flat roof?
It is skilled work rather than a straightforward DIY job, which is why the fitted rate runs £60 to £130 per square metre. EPDM rubber is the simplest to lay because it goes down in a single sheet with adhesive, whereas felt needs a torch and heat, and GRP fibreglass is laid wet and left to cure. A two-storey roof also needs scaffolding, adding £15 to £35 per square metre, so most homeowners use a roofer.
What time of year is the cheapest to replace a flat roof?
Winter and early spring tend to be cheapest, because roofers are quieter once the summer and autumn rush eases and are more willing to price keenly for work. Dry, mild spells still matter, as felt and GRP fibreglass need reasonable conditions to bond and cure, so a settled winter week is better than a wet one. The saving comes from demand, not from any change in the £60 to £130 per square metre rate itself.
Can I replace a flat roof myself?
On a small shed or garage you can, and since labour is roughly 55 to 65 percent of the total at £60 to £130 per m2, doing it yourself saves a real amount. The catch is the falls and the joints. Water sits on a flat roof, so a slight dip or a poor seam leaks. Felt and EPDM take skill to lay flat and bond, and scaffolding or a full deck strip pushes the job past most DIYers.
Is it worth replacing a flat roof rather than patching it?
If the deck is sound and the leak is one spot, a repair is cheaper. Once the covering is at the end of its life or the timber is wet, a full replacement at £60 to £130 per m2 is the honest fix, because patches on old felt keep failing. A new flat roof does not add much resale value on its own, but a dry, sound roof avoids far bigger damage below.
These are independent guide prices based on typical UK jobs in 2026. Your actual cost depends on your property, spec, access and where you live. Always get at least three written quotes before committing.