Flat roofing in Doncaster
Felt, rubber (EPDM) and fibreglass (GRP) flat roofs on extensions, garages, dormers and bay windows, repaired or replaced at a fixed written price.
Free, no obligation Fixed written price We never cold call
Which flat roof system?
| System | What it is | Best for |
|---|---|---|
| Felt (torch-on) | Layers of bitumen felt bonded to the deck | Garages and outbuildings where cost matters most |
| Rubber (EPDM) | A single sheet of synthetic rubber with no seams across the roof | Extensions and dormers, where few joints means few weak points |
| Fibreglass (GRP) | Glass-fibre matting set in resin to form a hard, seamless skin | Roofs you want to walk on, balconies, and a neat finish at the edges |
Repair or replace?
A single split or blister on an otherwise sound roof can be patched. Replacement is usually better value when the deck underneath feels soft or spongy, when it leaks again after a patch, or when a felt roof is more than about 15 years old.
A flat roof patch or repair typically costs £200 to £800 in the UK (2026 guide prices). A full replacement depends on the size, the system and the state of the deck, so we price it after the inspection.
Falls and drainage
A flat roof is never quite flat. It needs a slight fall so rain runs off to the gutter. Water that sits in puddles (ponding) is one of the most common reasons flat roofs fail early, so we check the falls and correct them when we replace a roof.
Warm roofs and Building Regulations
Replacing a flat roof over a heated room is a chance to add insulation on top of the deck (a warm roof), which keeps the room warmer and avoids condensation in the timbers. On larger replacements it may be required under Building Regulations. We'll tell you if it applies to yours.
Not sure what's wrong? We'll find out for free.
Questions people ask
How long does a flat roof last?
It depends on the system, the quality of the installation and how well water drains off it. Felt has the shortest life of the three; rubber and fibreglass last longer when they're laid well. We'll tell you what we find on yours and how long a repair is likely to buy you.
Can you fix a flat roof in the rain?
We can make a leaking flat roof safe in most weather, but bonding felt, rubber or resin needs a dry deck. Permanent work is booked for a dry spell.
Do you do garage roofs?
Yes, including concrete sectional and asbestos-cement garage roofs. Asbestos sheets have to be removed and disposed of by licensed specialists, which we arrange and show on the quote.
Related services
Roof leak repairs
Water coming through the ceiling? We trace where it gets in and fix the cause, not the stain.
More about roof leak repairsGutter repairs and guttering
Leaking joints, sagging runs, blocked downpipes and full uPVC replacements.
More about gutter repairs and gutteringRoof repairs
Slipped tiles, cracked slates, ridges, valleys and lead flashing, found, photographed and fixed.
More about roof repairsFlat roofs across Doncaster
Book a free roof inspection
Tell us what's wrong and where you are. We'll call you to arrange a time, inspect the roof, photograph every problem and send you a fixed written price.
Or call 01302 616311
- No charge and no obligation
- Photos of everything we find
- We never cold call or knock on doors