If your flat roof is failing, you have three main replacement options: EPDM rubber, GRP fibreglass, or high-performance felt. Each has genuine strengths. Here is the honest comparison so you can pick the right one for your Leeds property.

EPDM rubber

What it is

A single sheet of synthetic rubber, laid in one continuous piece over the deck. Adhesive-bonded, no seams on smaller roofs.

Cost

£90 to £110 per square metre fully fitted. A 15m² garage roof runs £1,400 to £1,650.

Lifespan and warranty

50-year expected life. 20-year manufacturer warranty on the membrane itself, 10-year workmanship guarantee from us.

Best for

Most residential flat roofs under 40m². Garages, rear extensions, single-storey additions. Fast to install (one to two days), forgiving in cold weather.

GRP fibreglass

What it is

Layers of fibreglass matting saturated in polyester resin, laid wet and cured hard. Seamless, ultra-durable finish.

Cost

£110 to £140 per square metre fully fitted. A 15m² garage runs £1,700 to £2,100.

Lifespan and warranty

25 to 30-year expected life. 20-year manufacturer warranty on materials, 10-year workmanship guarantee.

Best for

Roofs that will be walked on regularly (roof terraces, balconies), high-visibility roofs where you can see the finish, and any roof with complex shapes and upstands. Requires dry weather to install (curing time).

High-performance felt

What it is

Multiple layers of torch-on bitumen felt with a mineral-finish top layer. The traditional method, modernised.

Cost

£70 to £90 per square metre fully fitted. A 15m² garage runs £1,050 to £1,350.

Lifespan and warranty

15 to 20-year expected life. 10-year manufacturer warranty, 10-year workmanship guarantee.

Best for

Budget-conscious replacements, sheds, outbuildings, and roofs where the finish is not visible. Fine for the money, but EPDM or GRP will outlast it.

Our default recommendation

For most Leeds homeowners replacing a garage or rear-extension flat roof, we recommend EPDM. Best balance of cost, lifespan and install speed. GRP if you plan to walk on it. Felt only if budget is the deciding factor.

What is included in the quote

  • Strip and dispose of the old roof
  • Inspection and replacement of any rotten decking
  • New PIR insulation to current Building Regs U-values (if you want it)
  • New membrane fully bonded
  • New drip trims and upstands
  • Full manufacturer warranty registration in your name