GMG Roof Experts, the leading roofing company in London, offers top-tier roofing solutions tailored to your specific needs.
GMG Roof Experts install, repair and re-cover flat roofs across the whole London Borough of Hillingdon in felt, EPDM rubber and GRP fibreglass. We strip old, split or ponding coverings back to a sound deck, correct the falls, and lay the covering that suits the roof, the budget and how it is used, from a felt garage roof to a seamless GRP balcony. Garages, extensions, dormers, porches and small commercial roofs, from a single patch repair to a full re-cover, all from our Hayes UB3 base across Uxbridge, Hayes, Ruislip, Ickenham, Northwood and every postcode in between.
The background
Most flat roofs on Hillingdon homes sit over garages, single-storey extensions, dormers and bay windows, and most were originally covered in built-up felt. Felt has a hard life on a flat roof: it goes brittle in the sun, blisters and splits along the laps, and once it lets go the water sits on the deck and rots the boarding underneath. The other common fault, whatever the covering, is water that never drains, because the roof was laid dead level or the firrings have sagged, so it ponds in the low spots and works at every weak point.
There is no single right covering for every flat roof. Felt is still a sound, cost-effective choice for many garage and outbuilding roofs. EPDM rubber goes down as a single sheet on most domestic roofs with few or no field seams. GRP fibreglass laminates into a genuinely seamless, rigid surface that suits awkward shapes and areas that take foot traffic, like a balcony or roof terrace. Roof coatings can extend the life of a covering that still has some life left, without a full re-cover.
We assess the roof, how it is used, the budget and the deck before recommending a covering, and we will tell you honestly where a repair is the better spend rather than pushing a full re-cover you do not need.
We are based in Hayes, we work on flat roofs across Hillingdon every week, and we always sort the deck and the falls first, because any covering over a rotten deck or a ponding fall is still a roof that leaks.
What we do
From a new flat roof to a single patch repair, every job below is carried out by our own team, not subcontracted out, and every one starts with a close-up inspection and a written quote on request.
Stripping the old covering back to the deck, renewing soft boarding, correcting the falls and laying the covering that suits the roof and how it is used.
A sound, cost-effective covering for many garage and outbuilding roofs, laid in bonded layers with the laps sealed and dressed into a proper edge trim.
A single-sheet rubber membrane on most domestic roofs, with few or no field seams, bonded to the deck with upstands and trims to match.
A fully bonded, genuinely seamless laminate that suits awkward shapes, rooflight kerbs and balconies or roof terraces that take foot traffic.
Splits, blisters, lifted trims and ponding, repaired on felt, EPDM and GRP alike, with an honest call on repair versus re-cover.
A liquid-applied protective coating over a covering that still has life left, sealing minor surface faults and refreshing the finish without a full re-cover.
A re-cover starts with the deck, because every covering we lay is only as good as what it is bonded to. We strip the old felt, EPDM or GRP back to the boarding, cut out and renew anything soft or delaminated, and check the falls, adding tapered firrings where the roof has been ponding. That stage is not optional, whichever covering follows it.
With a sound, dry deck, we lay the covering that suits the roof: bonded felt for a straightforward garage or outbuilding, a single-sheet EPDM membrane for most extensions and dormers, or a laminated GRP finish for awkward shapes and areas that take foot traffic. Trims, outlet and flashings are fitted to match, and the roof is tested with water before we leave.
How it works
The process is the same whatever covering ends up on the roof, and it starts with a conversation, not a sales pitch.
Call 07949 999411 or use the contact form. Tell us what the roof covers, where it is leaking if it is, and roughly where the property is in Hillingdon.
We get up onto the roof, check the deck, the falls and the current covering, and send a written quote covering deck repairs, the recommended covering, trims, outlet and access, with a repair option where one is realistic.
We set up tower or scaffold access as needed, strip the old covering, renew any soft deck and correct the falls before any new covering goes down.
We lay the agreed covering, fit the trims, outlet and flashings, test the roof, clear up and take the waste away, and give you a written summary with photographs of the finished roof.
Choosing a covering
Not every flat roof needs the same covering, and the right choice depends on the roof's shape, how it is used and the budget. We assess all of that before recommending one, and we will tell you honestly where your existing covering still has life left and a coating is the better spend, rather than always pushing a full re-cover.
For a full technical look at EPDM rubber or GRP fibreglass, our dedicated pages go into the installation process, materials and repairs for each system in detail.
A bonded, multi-layer built-up covering, cost-effective for straightforward garage and outbuilding roofs.
A single-sheet membrane with few or no field seams, flexible enough to move with the building.
A fully bonded, genuinely seamless laminate, the strongest choice for awkward shapes and walked areas.
A liquid-applied refresh over a covering that is still structurally sound, sealing minor faults without a full re-cover.
Most flat roof faults are a genuine repair rather than a re-roof, whichever covering is on there. A split or puncture from foot traffic or a dropped tool, an edge trim that has lifted and is letting water track back under the covering, an upstand that has pulled away from the wall, or a low spot that ponds because the falls were never right.
We clean and prepare the area and repair it to suit the covering, felt patched and re-sealed, EPDM bonded with a fresh patch, GRP cut back and re-laminated, and trims and outlets re-secured or renewed. Where a roof ponds we can lift a local area, pack the fall with firrings and reinstate. What we will not do is patch a covering that has genuinely reached the end of its life and call it fixed, we will tell you straight if a re-cover is the better spend.
Homeowners often ask us to just tell them which covering to have, and honestly it depends on the roof. Felt is still a sensible, cost-effective choice for a straightforward garage or outbuilding roof with no awkward junctions. EPDM suits most extension and dormer roofs well, going down as a single sheet that moves with the building through hot and cold weather. GRP earns its place where the shape is awkward, where there are multiple upstands and kerbs, or where the roof will be walked on regularly as a balcony or terrace.
We look at the roof's shape, how it will be used, and the budget, and give you a straight recommendation rather than steering you toward whichever system happens to be easiest for us that week.
Completed work
Every image below is a real GMG Roof Experts photograph taken from the company's own site, across felt, EPDM, GRP and roof coating work. Each one appears once, and the caption names the type of work where it could be confirmed from the source.
Flat roofing is a defined part of what we do from our Hayes base, inside the borough, across felt, EPDM and GRP. That means we sort the deck and the falls first, and recommend the covering that suits the roof rather than defaulting to whichever system we happen to prefer.
Our work runs from patching a split on a sound roof to a full strip, deck renewal and re-cover in the covering that fits. We are CITB certified, fully insured, and every job on this page is a real GMG photograph, and every job ends with a written summary and photographs of the finished roof.
Areas we cover
We cover the whole borough and the areas that border it. Each town below has its own location page with more local detail. If your postcode starts with UB3, UB4, UB7, UB8, UB9, UB10, HA4, HA5, HA6, SL0, SL9 or SL2, we can help.
Extension and outrigger flat roofs on Victorian and Edwardian terraces, with old felt failed at the wall abutment.
Roofers in Uxbridge →Our home patch. Garage and extension roofs re-covered in felt, EPDM or GRP after split covering and ponding.
Roofers in Hayes →1930s semis with flat-roofed bay windows and rear additions, and detached garages needing a new covering.
Roofers in Ruislip →Larger homes with dormer roofs, rooflight kerbs and extension roofs suited to EPDM or GRP.
Roofers in Ickenham →Large detached properties with flat-roofed link extensions, garden rooms and balconies over living space.
Roofers in Northwood →Iver, Gerrards Cross and Stoke Poges in Buckinghamshire, where extension and outbuilding flat roofs need a lasting re-cover.
Ask about your area →Flat roofers near me
We cover every part of the borough for this work, not just the main towns, and our team is based in Hayes, so the person who inspects your flat roof is the person who scopes and prices the job.
GMG Roof Experts carries out new flat roof installation, felt, EPDM and GRP re-covers, flat roof repairs and roof coatings across Uxbridge, Hayes, Ruislip, Eastcote, Ickenham, Hillingdon village, Northwood, Yiewsley, West Drayton and Harefield, plus the bordering areas of Iver, Gerrards Cross and Stoke Poges. For a flat roof leaking into the room below we aim to attend a Hillingdon property the same or next working day.
Areas covered
Every area below is part of our regular coverage for this work. Where we have a dedicated location page, the pill links through to it.
Find us
GMG Roof Experts
30 Townfield Road, Hayes, UB3 2EP
Phone: +44 7949 999411
Email: info@gmgroofexperts.com
Hours: 24 hours a day, 7 days a week for emergency call-outs
Questions
The questions below come up most often from Hillingdon homeowners, landlords and businesses.
It depends on the roof. Felt is a sensible, cost-effective choice for a straightforward garage or outbuilding roof. EPDM rubber, laid as a single sheet, suits most extension and dormer re-covers. GRP fibreglass, a genuinely seamless laminate, earns its place on awkward shapes, multiple upstands or areas that will be walked on regularly, like a balcony. We recommend based on the roof, not a single preferred system.
The most common causes are a covering that has reached the end of its life, a covering laid over a deck that has since gone soft, and ponding where the roof was laid dead level or the falls have sagged. We check all three before recommending a fix, because covering just one usually means the leak comes back.
No. Where a covering is still structurally sound with only minor surface faults, a repair or a roof coating can be the better spend. We will tell you honestly which situation you are in rather than pushing a full re-cover you do not need.
Most garage and extension roofs are completed within a few days once access is arranged, including deck repairs, covering and trims. Larger or more complex roofs, or ones needing a full structural deck rebuild, take longer. We give a realistic timescale in the written quote.
Occasional maintenance access is fine on most coverings. For an area used regularly as a balcony or terrace, GRP fibreglass with an anti-slip topcoat, or a dedicated walkway system, is the better choice, because a soft membrane wears faster under repeated foot traffic.
Ponding means the roof was laid dead level or the firrings have sagged, so water sits in the low spots instead of draining to the outlet. It matters because standing water works at every weak point and shortens the life of any covering. We correct the falls with tapered firrings as part of a re-cover or a larger repair.
Not usually the whole deck. We strip the old covering, then cut out and renew only the boards that are soft or delaminated, commonly around the edges and the outlet. A sound, dry, level deck is what any covering needs to last.
Yes. We carry out flat roof installation, repair and re-covering on small commercial buildings as well as homes, using the covering that suits the size and use of the roof.
We inspect the roof and the deck in person, then send a written quote covering deck repairs, the recommended covering, trims, outlet, flashings and access. Where a repair or a coating is realistic we quote that too. All pricing is on request after that visit, because covering choice, deck condition and access are the biggest variables.
We are based in Hayes and cover the whole London Borough of Hillingdon for flat roof services, including Uxbridge, Hayes, Ruislip, Eastcote, Ickenham, Hillingdon village, Northwood, Yiewsley, West Drayton and Harefield, plus the bordering Buckinghamshire areas of Iver, Gerrards Cross and Stoke Poges. Call 07949 999411 to check your postcode.
Call now for a same-day response where the job allows it, or request a written quote following an inspection of the roof and the deck.
A written quote follows every inspection, we put the deck and the falls right first, and we recommend felt, EPDM or GRP based on the roof, not a single preferred system.
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GMG Roof Experts, 30 Townfield Road, Hayes, UB3 2EP. Email info@gmgroofexperts.com. Flat roof installation, repair and re-covering in felt, EPDM rubber and GRP fibreglass across the London Borough of Hillingdon, including Uxbridge, Hayes, Ruislip, Eastcote, Ickenham, Hillingdon village, Northwood, Yiewsley, West Drayton and Harefield, plus bordering Iver, Gerrards Cross and Stoke Poges.