Flat roofs on extensions, garages, dormers and outbuildings need specialist attention. We install GRP fibreglass, EPDM rubber membrane and high-performance built-up felt systems — each specified to su Serving Shepherd's Bush and all surrounding areas in Hammersmith & Fulham.
Flat roofs on extensions, garages, dormers and outbuildings need specialist attention. We install GRP fibreglass, EPDM rubber membrane and high-performance built-up felt systems — each specified to suit the size, use and exposure of your flat roof. Every installation includes proper falls, drainage and upstand detailing.
The most common flat roof failure in Shepherd's Bush is inadequate drainage. Original felt roofs from the 1960s-80s were often laid with insufficient fall — water pools, UV breaks down the membrane, and leaks follow. We install minimum 1:40 falls on every job using tapered insulation boards.
Before any new flat roof goes on in Shepherd's Bush, we strip back to the deck and inspect the timber. In Shepherd's Bush properties, we commonly find rotten plywood caused by years of ponding from inadequate falls. Catching this before the new membrane goes down saves a callback later.
GRP fibreglass gives a seamless, rigid surface that handles foot traffic — ideal for balconies and walkable roofs. EPDM rubber is flexible, handles movement well, and comes in single sheets that eliminate seam failures. For most Shepherd's Bush extensions under 20m², GRP is our recommendation.
Victorian and Edwardian terraces surrounding Shepherd's Bush Green, with larger Edwardian villas on the streets running north. Post-war estates including the White City estate. The BBC area has seen significant modern development. Mixed stock around Goldhawk Road. For flat roofing work in Shepherd's Bush, this housing profile means we commonly encounter Victorian terraces with poorly maintained parapets — crumbling coping stones let water behind flashings causing internal damp that takes years to diagnose. Edwardian slate roofs on larger villas now p
The streets of Shepherd's Bush — including Uxbridge Road Shepherd's Bush, Goldhawk Road, Askew Road — have roofing characteristics that reflect their construction era and the specific exposure conditions of Hammersmith & Fulham. As an inner London borough flanking the Thames, Hammersmith & Fulham experiences the full urban heat island effect — summer roof surface temperatures regularly exceed 60°C, driving extreme thermal cyc
Flat Roofing in Shepherd's Bush: £800–£6,000 depending on scope, access and materials. Free, written, no-obligation quotes. Call 0203 302 2547.
Free quotes, no call-out fees, same-day emergency service.
📞 Call Now: 0203 302 2547"Lead flashing repair on our bay window roof — called on a weekday and they were out within days. Professional, tidy, and the price was exactly as quoted. Highly recommend."
"New roof on our garage — grp flat roof — called on a weekday and they were out within days. Professional, tidy, and the price was exactly as quoted. Highly recommend."
"Emergency tarp-up after storm damage — back within 3 hours — called on a weekday and they were out within days. Professional, tidy, and the price was exactly as quoted. Highly recommend."
A typical single-storey rear extension flat roof in Shepherd's Bush costs £1,200–£3,000 depending on size and system. Garage roofs run £800–£2,000. Larger commercial or multi-section flat roofs can be £4,000–£6,000+.
GRP fibreglass lasts 30-40 years with minimal maintenance. EPDM rubber membrane lasts 25-30 years. Traditional felt typically lasts 10-15 years. We recommend GRP or EPDM for any flat roof in Shepherd's Bush — the upfront cost is recovered many times over in lifespan.
Yes — GRP fibreglass is seamless, UV-stable, impact-resistant and lasts 2-3 times longer than felt. The only advantage felt has is lower upfront cost, which is a false economy over 20+ years.
If the membrane is sound but a localised area has failed, we can patch repair. If the membrane is blistered, cracked or ponding across more than 20% of its area, full replacement is more cost-effective.
Under current Building Regulations, any flat roof replacement must include insulation to meet thermal performance standards. We install rigid insulation boards above the deck, which also creates the correct drainage falls.
The three most common causes in Shepherd's Bush are: ponding water from inadequate falls, membrane failure at upstands and abutments, and blocked outlets. All three are preventable with correct specification and installation.
A typical extension flat roof takes 1-2 days. Larger projects or those requiring significant deck repairs take 2-4 days. Weather-dependent — GRP cannot be laid in rain.
Hammersmith and Fulham packs more Victorian terraced housing per square mile than almost anywhere in London, and the roofing challenges reflect this density. Fulham's grid streets between Fulham Palace Road and Wandsworth Bridge Road contain thousands of two-storey terraces with the characteristic butterfly roof profile — an M-shaped valley roof where all rainwater channels to a concealed central valley. This design was elegant and space-efficient when built in the 1880s; 140 years later, those central valleys are the most common single point of failure we see across the borough.
As an inner London borough flanking the Thames, Hammersmith and Fulham experiences the full urban heat island effect. Summer roof surface temperatures regularly exceed 60°C, driving extreme thermal cycling on lead, zinc and felt that accelerates material fatigue. The Thames frontage along Hammersmith and Fulham reaches means riverside properties face persistent damp exposure and occasional flood risk. Winter storms funnel between terraced streets, creating localised wind loading that displaces ridge tiles and lifts flashings.
Fulham property prices have risen dramatically — a standard Victorian terrace that sold for £400,000 fifteen years ago now commands £1.2-1.5 million. At these values, a sound roof is a non-negotiable expectation from buyers, mortgage lenders and insurers. The cost of a complete butterfly valley replacement and roof overhaul on a Fulham terrace is typically £5,000-8,000 — a fraction of the value it protects.
Flat roof installation follows a strict sequence that cannot be shortcut. Stage one: strip the existing covering and inspect the deck. Stage two: repair or replace any damaged deck timbers — rotten OSB or plywood is the most common finding on existing flat roofs. Stage three: install tapered insulation boards to create the correct drainage falls (minimum 1:40 gradient). Stage four: apply the chosen membrane system — GRP fibreglass with resin lamination, or EPDM rubber with bonded seams. Stage five: detail all upstands, drip edges and abutments. Stage six: inspect, photograph and hand over.
GRP fibreglass creates a seamless, rigid surface that handles foot traffic and resists impact — ideal for balconies, walkable roofs and areas where you need to access equipment. EPDM rubber is flexible, accommodates structural movement, and comes in single sheets up to 15m wide that eliminate seam failures. Both systems carry 25-40 year lifespans when correctly installed. We do not install traditional felt systems for new work — the lifespan is too short to justify the labour cost of installation.
All flat roof installations carry our 10-year workmanship guarantee. GRP systems additionally carry a 25-year manufacturer guarantee on the membrane when installed by an approved contractor — which we are. EPDM carries a 20-year manufacturer guarantee on the membrane. These guarantees are meaningful because both products have track records exceeding their guarantee periods.
Flat roof problems show up as damp patches on ceilings below.
When it is not the answer: Single split with sound membrane elsewhere: patch repair is effective. Read the full guide.
Membrane checked plus test strip to check deck timber.
GRP or EPDM recommended. Full breakdown.
Old membrane stripped, deck repaired, tapered insulation, new membrane.
Falls tested, photographs, guarantee.
| Job | Typical duration |
|---|---|
| Extension (GRP) | 1-2 days |
| Garage | 1 day |
| Dormer/balcony | 2-3 days |
| Multi-section | 3-5 days |
GRP needs dry, above 5C. EPDM more forgiving.
Most flat roof work from ladders or interior. Scaffold is specified for: second-floor flat roofs, dormers, edge protection - always itemised in your written quote, never a hidden extra, and we arrange it.
Victorian terraces and mansion flats — access and scaffold requirements vary by street. Pavement scaffold and skip permits go through Hammersmith & Fulham Council; allow a few working days on streets like Goldhawk Road, Askew Road where space is tight.
| Job | Typical range | Notes |
|---|---|---|
| Extension — GRP | £1,400-£3,200 | Most common residential |
| Extension — EPDM | £1,200-£2,800 | Single-sheet flexible |
| Garage | £900-£2,200 | By size and access |
| Dormer/balcony | £1,800-£4,000 | Edge + upstand detailing |
| Deck repair | £400-£1,200 | Add to membrane cost |
Worked example: 14m2 rear extension GRP: strip, 3 boards (£180), insulation (£320), GRP (£680), labour (£540) — £1,720.
No deposit under £2,000. Larger: 30% with order, balance on completion.
Covering W12, W14 and surrounding postcodes.
10-year workmanship. GRP 25-year membrane. EPDM 20-year.
If a fault appears in covered work, we come back and put it right. No quibbling, no re-charge.
Minimal internal. Chemical smell from GRP for 24 hours. You do not need to stay home for external work - we just need power and access agreed in advance.
GRP needs dry. EPDM more weather-tolerant. London microclimate — urban heat island slows frost damage but accelerates lead fatigue from thermal cycling.
No call-out fees. No obligation. Just an honest quote from a local Shepherd's Bush roofer who turns up when they say they will.
0203 302 2547 📞 Call Now: 0203 302 2547