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New EPDM rubber flat roof on a home extension

Flat Roofing in London

Flat roofing is a specialism, not a sideline — we route your request to roofers who install EPDM and GRP week in, week out. Covering WC2N, SW1A, NW1, N7, SW9, SW4, E1W, E98.
WC2NSW1ANW1N7SW9SW4E1WE98
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Find Trusted Roofers connects homeowners across London and the wider Westminster area with local roofers who work on the area's roof types.

Flat Roofing in London

Flat roofs are everywhere across London's rear extensions, dormers and garages, usually sitting alongside the main pitched roof's Welsh slate or clay tile covering rather than replacing it. When the felt blisters or water pools after rain, the fix is different from anything to do with the main roof above. We connect homeowners across London with local roofers who install and repair EPDM, GRP and felt flat roofing on the capital's terraces and extensions.

Flat roofing in London covers the EPDM, GRP and felt roofs common on rear extensions and dormers across the city's terraced streets. A single garage flat roof typically costs £1,000–£2,000 in EPDM, with extension roofs running £2,000–£5,000 depending on size.

Roofing in London — what local roofers know

London's dense terraced streets, from Tower Hamlets to Wandsworth, are full of rear-extension flat roofs added long after the original Welsh slate or clay tile pitched roof went up, and these newer flat sections fail on their own timeline. Ponding water, blistered felt and failed upstands where the flat roof meets the house wall are common on the kitchen extensions and loft dormers found across areas like Hammersmith and Fulham. Storm Eunice in 2022 and Storm Ciarán in 2023 both put extra strain on these junctions, driving rain into upstands that were already borderline. London's moderate exposure rating means the bigger factor here is usually the age and detailing of the flat roof itself rather than severe coastal weather, but a flat roof installed decades ago in old-style felt is well past the point where EPDM or GRP would be the sounder choice.

  • Traditional Welsh slate roofs needing like-for-like repair rather than tile substitution
  • Wind damage from recent named storms (Storm Eunice) loosening tiles, ridges and flashings
  • Older housing stock with original pitched roofs prone to slipped tiles, worn valleys and perished underlay

How it works in London

  1. 1 Tell us once. Describe the job and your postcode. It takes under two minutes and there's no phone call to sit through.
  2. 2 We match you locally. We pass your request to a roofer in our network who covers WC2N/SW1A and works on your roof type.
  3. 3 You get a proper quote. The roofer surveys the roof and quotes in writing before any work begins. You choose whether to go ahead.

Flat Roofing costs in London

Every job is quoted after a proper look at the roof — access, materials and condition all change the price, so beware of anyone quoting a fixed figure over the phone. See the Flat Roofing FAQs below for realistic UK price ranges, and request quotes to get real numbers for your roof in London.

Roofing in London

Local facts a good roofer factors in before quoting.

Population
8,900,000
Postcode districts
WC2NSW1ANW1N7SW9SW4E1WE98
Council
Westminster
Dominant roof types
Welsh slateclay plain tileclay peg tile
Weather exposure
ExposureModerate
CoastalNo
Common local roofing issues
Traditional Welsh slate roofs needing like-for-like repair rather than tile substitutionWind damage from recent named storms (Storm Eunice) loosening tiles, ridges and flashingsOlder housing stock with original pitched roofs prone to slipped tiles, worn valleys and perished underlay

This information helps the roofers in our network quote accurately.

Illustrative example of typical work

A typical flat roofing job in London

Area:
London
Service:
Flat Roofing

A homeowner in the Fulham area noticed water pooling on a rear extension roof after every rainfall. They submitted a request describing the extension's age and the ponding pattern, and we matched them with a local roofer covering that postcode. The roofer inspected the deck and falls, diagnosed inadequate drainage rather than a simple leak, and provided a written quote for a replacement before any work began.

This describes typical work carried out by roofers in our network. Names and specific details have been omitted to protect customer privacy.

Flat Roofing in London — FAQs

Which flat roofing material suits a London rear extension?
EPDM rubber is flexible, quick to install and works well on the extension and garage flat roofs common across boroughs like Southwark and Lewisham, while GRP gives a seamless finish suited to walk-on roofs. As a UK-wide guide, extension roofs typically cost £2,000–£5,000 depending on size and edge detailing, with a specialist recommending based on the actual deck.
Why does my London extension roof keep ponding water after rain?
The usual cause is inadequate falls in the original build, sometimes worsened by wind-driven rain during storms like Eunice or Ciarán finding weaknesses in the upstands. A repair that ignores the underlying falls will pond again — insist on a proper diagnosis rather than just a patch.
Do building regulations require extra insulation when replacing a flat roof in London?
Generally yes — building regulations require upgrading insulation when substantially replacing a flat roof, and a warm-roof build-up with rigid insulation above the deck is the standard modern approach for the rear extensions and dormers found across London's terraced streets.
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.

Other roofing services in London

Flat Roofing near London

We connect homeowners with local roofers across the towns around London. Pick a town to see local roofing coverage.

Our London service area

Find Trusted Roofers connects homeowners across London and the wider Westminster area with local roofers who work on the area's roof types. The roofers in our network cover the WC2N, SW1A, NW1, N7, SW9, SW4, E1W, E98 postcode districts. Nearby coverage includes Birmingham, Bristol, Sheffield, Manchester.

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Find Trusted Roofers connects homeowners across London and the wider Westminster area with local roofers who work on the area's roof types.

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