Outbuilding & flat roofing
Roofing
Flat roofing in London
Rubber, fibreglass and felt flat roofs for extensions, dormers, garages and garden buildings — built to drain properly and last.
What we do
Flat roofing, done properly.
Flat roofs are everywhere in London: rear extensions, dormers, garages, bays and garden buildings. Most flat roof problems come from poor falls, tired coverings and badly detailed edges and upstands, so a good flat roof starts underneath the membrane.
We install and repair flat roofs in EPDM rubber, GRP fibreglass and high-performance felt, and recommend the right system for the building, the access and your budget.
01
EPDM rubber roofs
Single-ply membrane with clean, long-lasting detailing.
02
GRP fibreglass
Seamless, hard-wearing finish, good for detailed roofs.
03
Felt roofing
Proven, cost-effective multi-layer systems.
04
Warm roof build-ups
Insulation above the deck, with falls built in where needed.
05
Rooflights & upstands
Neatly detailed openings and edges.
06
Flat roof repairs
Blisters, splits, failed edges and ponding put right.
Choosing the right covering
EPDM is a durable rubber membrane that suits simple roofs and gives a clean finish. GRP (glass-reinforced plastic) is laid wet and cures into a seamless, hard-wearing surface that copes well with complicated shapes. High-performance felt remains a proven, cost-effective choice.
We will recommend a system based on the size and shape of the roof, how it will be used, access and budget — and explain why.
Flat roofs on new buildings
We also build flat roofs as part of our building work. A recent example is a bespoke garden gym, finished with a strong, weatherproof flat roof — the same care goes into roofs on extensions, garages and commercial buildings.
Our work
Photographed on our own jobs.
Every photo on this page is genuine Swift Fix work. Tap any image to see it larger.
Related projects
See it on a real job.
Which is better, EPDM or GRP?
Both are good systems. EPDM is quick to install with clean detailing and suits simpler roofs; GRP gives a seamless, hard finish and handles complex shapes well. We will recommend one based on your roof.
Can you fix water pooling on my flat roof?
Standing water usually means the roof lacks proper falls. We can rebuild the roof with tapered insulation or firrings so water runs off to the outlets.
Do you do flat roofs on garden buildings?
Yes — including garden rooms, gyms, garages and outbuildings.
One team, the next trade
Adding an extension or a garden room? We build the structure and the flat roof on top of it.
Free quotes · No obligation
Planning your next project?
Speak to Swift Fix about your building, roofing or refurbishment project. Free, no-obligation quotes across London and Kent.