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Felt, EPDM and GRP in WalsallFlat Roofing in Walsall
Flat roof repairs in Walsall cost £200 to £800. Full replacement runs £1,000 to £2,200 for a garage and £1,500 to £6,000 for an extension. We check the deck underneath before quoting any of them, because a new membrane over rotten boards fails within a year.
- ✓Deck inspected before every quote
- ✓EPDM, GRP or felt matched to the job
- ✓Repairs from £200, same-day for leaks
- ✓Written guarantee
Flat roof systemsWhich flat roof system?
| System | Cost per m² | Lifespan | Best for |
|---|---|---|---|
| Torch-on felt (3 layer) | £50–£80 | 15–25 years | Budget-led, sheds, garages |
| EPDM rubber | £70–£110 | 30–50 years | Extensions, garages, few seams |
| GRP fibreglass | £80–£130 | 25–40 years | Complex shapes, walked-on roofs |
| Job | Typical cost | What moves it |
|---|---|---|
| Flat roof patch repair (any system) | £200 to £800 | Membrane, deck damage, size |
| Outlet clear and reseal | £100 to £250 | Height, access |
| Single garage, EPDM | £1,000 to £1,800 | Deck, size |
| Single garage, GRP | £1,200 to £2,200 | Deck, complexity |
| Extension roof (15–25 m²), EPDM | £1,500 to £3,500 | Deck, insulation |
| Extension roof, GRP | £2,000 to £4,500 | Shape, walked-on |
| Deck replacement | £30 to £60 per m² | Extent of rot |
| Warm roof insulation upgrade | £40 to £70 per m² | Depth needed |
Full breakdown in the roof repair cost guide.
30 to 50 years when the deck is dry and it is fitted with the right adhesive and trims.
Sometimes, on a sound felt roof with no ponding. Usually not on Walsall extensions because the felt has trapped moisture.
If the room below is lived in, Building Regulations expect insulation when you replace the covering.
Ponding reaching a failed seam or trim it does not normally reach. Usually a falls or drainage problem.
Repair when the fault is local and the rest is sound. Replace when it is blistered across the surface, has ponded for years, or the deck is soft.
Last reviewed September 2026. Prices are the ranges we work to in Walsall.
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Roofers Walsall Ltd · Company No. 00000000
14 Bridge Street, Walsall WS1 1HR
Public liability £5,000,000
★ Google rating [live]
CONTACT
WhatsApp 07000 000 000
01922 000 000
[email protected]
Hours: Open 24 hours, 7 days a week
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