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Roofer laying a rubber membrane on a flat roof 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.
Published by Find Trusted Roofers · Last updated
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About flat roofing

Flat roofs fail in different ways to pitched roofs: ponding water, blistered felt, cracked corners and failed upstands where the roof meets the wall. Modern materials have changed what a flat roof can do. A properly fitted EPDM rubber or GRP fibreglass roof should last 25 years or more, far beyond the old three-layer felt. Our flat-roofing specialists repair and replace roofs on extensions, garages, dormers, bay windows and balconies. Some roofs just need a patch. Others need the deck replaced, and a good specialist tells you honestly which one you're facing.

How we help

Find Trusted Roofers is a national network that connects UK homeowners with local roofers. Since we are not a roofing contractor, we don't do the work ourselves. Instead, you tell us about your flat roofing job once. We then 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, and you deal directly with them and choose whether to proceed.

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

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, so 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, while a typical extension roof runs £1,800–£3,500, 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, and cracked or blistered covering. Failed upstands and flashings at walls and skylights, or a rotten deck flexing underneath, are also common. Since 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 — 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 it noticeably improves the room below.

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