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New EPDM rubber flat roof on a home extension

Flat Roofing

Flat roofing is a specialism, not a sideline — we route your request to roofers who install EPDM and GRP week in, week out.
  • Free, no-obligation quotes
  • Local roofers in our network
  • TrustMark & NFRC framing checked

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About flat roofing

Flat roofs fail differently from pitched roofs: ponding water, blistered felt, cracked corners and failed upstands where the roof meets the house wall. Modern materials have transformed what a flat roof can do — a properly installed EPDM rubber or GRP fibreglass roof should last 25 years or more, far beyond the old three-layer felt systems. The flat-roofing specialists in our network repair and replace roofs on extensions, garages, dormers, bay windows and balconies, and will tell you honestly whether a repair will hold or the deck underneath has had it.

How we help

Find Trusted Roofers is a national network that connects UK homeowners with local roofers. We are not a roofing contractor and we don't do the work ourselves — instead, you tell us about your flat roofing job once, and we match you with a roofer in our network who covers your postcode and works on your roof type. Every roofer quotes from their own survey; you deal directly with them and choose whether to proceed.

We check the roofers in our network against Companies House, confirm public liability insurance, and note any TrustMark, NFRC or CompetentRoofer membership. We verify what we can — we don't guarantee the work, which is contracted directly between you and the roofer.

Available across the UK

We connect homeowners with local roofers offering flat roofing in towns and cities across England, Scotland, Wales and Northern Ireland. Browse areas we cover.

Flat Roofing — FAQs

Which is better: EPDM rubber, GRP fibreglass or felt?
EPDM is flexible, quick to install and excellent on garages and extensions. GRP gives a seamless, hard-wearing finish ideal for balconies and walk-on roofs. Modern torch-on felt is still a legitimate budget option. The right choice depends on the roof's size, traffic and detailing — a specialist will recommend based on the actual deck.
How much does a new flat roof cost?
As a guide, replacing a single garage flat roof runs about £1,000–£2,000 in EPDM; extension roofs typically £2,000–£5,000 depending on size and edge detailing. GRP costs a little more than EPDM; felt a little less.
How long does a flat roof last?
Old-style felt: 10–15 years. Modern high-performance felt: up to 20. EPDM rubber and GRP fibreglass: 25–30+ years when properly installed on a sound deck with correct falls.
Why does my flat roof keep leaking?
The usual suspects are ponding water from inadequate falls, cracked or blistered covering, failed upstands and flashings at walls and skylights, or a rotten deck flexing underneath. A repair that ignores the underlying cause will fail again — insist on a diagnosis, not just a patch.
Can you insulate a flat roof when replacing it?
Yes — and building regulations generally require upgrading insulation when substantially replacing a flat roof. A warm-roof build-up with rigid insulation above the deck is the standard modern approach and noticeably improves the room below.

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