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 Barnes and all surrounding areas in Richmond upon Thames.
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 Barnes 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 Barnes, we strip back to the deck and inspect the timber. In Barnes 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 Barnes extensions under 20m², GRP is our recommendation.
Victorian and Edwardian terraces and villas throughout, with some Georgian properties near the riverside. Barnes Common area has larger detached houses. The Wetland Centre and reservoir create a unique microclimate. Heavy conservation area coverage. For flat roofing work in Barnes, this housing profile means we commonly encounter Thames flood risk is real — properties on Castelnau and the lower reaches flood periodically, driving moisture into ground floors and roof timbers from below. Wetland Centre proximity maintains high h
The streets of Barnes — including Church Road Barnes, Castelnau, Lonsdale Road — have roofing characteristics that reflect their construction era and the specific exposure conditions of Richmond upon Thames. The Thames winds through the borough from Hampton in the west to Kew and Barnes in the east, creating a microclimate with higher humidity than inland areas. Properties near the river in Barnes, Twicke
Flat Roofing in Barnes: £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"Emergency roof repair after a branch came through the tiles — called on a weekday and they were out within days. Professional, tidy, and the price was exactly as quoted. Highly recommend."
"Complete gutter and fascia replacement — called on a weekday and they were out within days. Professional, tidy, and the price was exactly as quoted. Highly recommend."
"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."
A typical single-storey rear extension flat roof in Barnes 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 Barnes — 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 Barnes 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.
Richmond upon Thames has the highest concentration of historic roofing in West London. Georgian townhouses on Richmond Hill carry original Welsh slate roofs that have been patched, repaired and partially replaced over 200+ years. The borough's 73 conservation areas — more than any other London borough — create a planning framework that requires roofing work to use period-appropriate materials, colours and methods. This is not optional — enforcement action for non-compliant roofing materials is actively pursued.
The Thames winds through Richmond from Hampton to Barnes, creating a humidity corridor that accelerates moss growth, lead oxidation and timber deterioration on riverside properties. Richmond Park's 2,500 acres of open ground creates a cold air reservoir that drains downhill toward riverside properties in the early morning hours, causing heavy condensation on roof surfaces. This combination of moisture and temperature fluctuation makes annual roof inspections essential for Richmond properties.
Richmond has some of the highest property values in London outside the central boroughs. Georgian houses on Richmond Hill regularly sell above £2 million, and the roofing specification expected at this price point is correspondingly high. Original Welsh slate, cast lead guttering, lime mortar pointing and hand-dressed flashings are the standard — not premium upgrades. The cost of a heritage-grade re-roof on a Richmond Hill property can exceed £30,000, but the alternative is unthinkable for properties at this value.
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.
No call-out fees. No obligation. Just an honest quote from a local Barnes roofer who turns up when they say they will.
0203 302 2547 📞 Call Now: 0203 302 2547