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 Kenton and all surrounding areas in Harrow.
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 Kenton 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 Kenton, we strip back to the deck and inspect the timber. In Kenton 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 Kenton extensions under 20m², GRP is our recommendation.
Almost entirely 1930s Metroland semi-detached housing with concrete interlocking tiles. Uniform streets of bay-fronted semis with hipped roofs. Some post-war infill. Very consistent housing stock means roofing problems are similarly consistent across the area. For flat roofing work in Kenton, this housing profile means we commonly encounter Concrete interlocking tile failure is the dominant issue — entire streets of Kenton semis were built in the same 5-year window and their roofs are failing in the same 5-year window. Ridge tiles re-bed
The streets of Kenton — including Kenton Road, Kenton Lane, Woodcock Hill — have roofing characteristics that reflect their construction era and the specific exposure conditions of Harrow. Harrow's elevated position means roofs here face wind loading that properties in the Thames valley floor simply do not experience. Harrow on the Hill is fully exposed to south-westerly gales — wind sp
Flat Roofing in Kenton: £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"Chimney stack partial rebuild and re-render — called on a weekday and they were out within days. Professional, tidy, and the price was exactly as quoted. Highly recommend."
"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."
"Moss removal and full roof clean — 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 Kenton 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 Kenton — 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 Kenton 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.
Harrow's hilltop position has shaped its roofing history for centuries. Harrow School, founded in 1572, sits atop one of London's highest points at 124 metres — and the roofs of its listed buildings have withstood four centuries of some of the most aggressive weather exposure in Greater London. The conservation area around the Hill contains Grade II listed buildings where original Welsh slate and handmade clay tile roofs demand specialist maintenance using period-appropriate materials and techniques.
Wind is Harrow's defining roofing challenge. Harrow-on-the-Hill is exposed to south-westerly gales that drive rain horizontally into mortar joints, accelerate lead fatigue through constant flexing, and create uplift forces on ridge tiles that sheltered locations simply do not experience. Weather station data consistently shows wind speeds 15-20% higher on the Hill than at equivalent lowland sites. This is not a marginal difference — it translates directly into mortar joints failing twice as fast and ridge tiles needing re-bedding twice as frequently.
Pinner's conservation area and village character drive property premiums that make roof maintenance an investment priority. Tudor and period properties on Pinner High Street and the surrounding conservation area require specialist roofing skills — lime mortar repointing, handmade peg tile sourcing, and lead detailing that matches the original specification. These are not jobs for general builders.
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 Kenton roofer who turns up when they say they will.
0203 302 2547 📞 Call Now: 0203 302 2547