Flat roofing in Guildford & Surrey
Felt and membrane flat roofs for extensions, garages and outbuildings.
What's involved
Flat roofing covers felt and single-ply membrane systems for extensions, garages, dormers and outbuildings. It's not just laying a covering. Getting the falls right, so water actually runs off to the outlets rather than sitting on the surface, matters more on a flat roof than almost anything else we do. We also check the deck underneath, since a covering laid over rotten boarding will fail again no matter how well it's fitted, and correct any weak points at upstands, edges and where pipework passes through before the new covering goes down.
Signs you need attention
Ponding water that's still sitting on the roof a day or two after rain, felt that's bubbled, blistered or gone brittle and cracked, or a leak showing up at an edge, upstand or where the flat roof meets a wall. Dark staining or sagging on a garage or extension ceiling underneath is often the first sign from the inside. Small splits and open laps only get bigger, so catching a flat roof problem early is usually the difference between a repair and a full renewal.
What to expect from us
We'll assess whether the existing roof can be repaired or overlaid, or whether it needs stripping back and renewing, and explain why, rather than just recommending the bigger job by default. Falls are corrected as part of any renewal so ponding doesn't just come back in a year, and edge trims and upstands are properly detailed so the covering doesn't fail again at the same weak points. You'll get a written quote covering exactly what's included before any work is booked in.
How long it takes
A small repair, on a garage roof or a single problem area, is usually a one-day job. A full felt or membrane renewal on an extension typically takes two to three days depending on size and how much of the deck beneath needs attention. We'll confirm a firm timeframe once we've seen the roof and know exactly what we're dealing with underneath.
Common questions about flat roofing
Felt or membrane: which is better?
Both do a good job when fitted correctly. Membrane tends to last longer and handle movement better; felt is a proven, cost-effective option for smaller roofs. We'll recommend based on your roof, not push one over the other.
Can you fix ponding water?
Usually, yes, by correcting the falls so water reaches the outlets instead of sitting on the roof. This is often done as part of a renewal rather than a standalone repair.
Can you flat-roof a new extension?
Yes, we regularly work with builders and homeowners to cover new extensions, garages and outbuildings as part of a wider build.
How do I know if it needs repairing or replacing?
We'll tell you honestly on site. A single split or damaged area is often a straightforward repair; widespread cracking, blistering or a roof that's simply reached the end of its life needs renewing.
Need flat roofing?
Free, no-obligation quotes across Guildford and Surrey.