A watertight, worry-free flat roof.
A professionally installed or repaired flat roof is more than just a surface — it's a critical investment in your property's safety and value.
- ✓EPDM and GRP flat roof systems with 20-year manufacturer guarantees
- ✓Most flat roof replacements completed in 2-3 days
- ✓Repairs from £200 — full replacements from £1,500
- ✓Free inspection and quote with no call-out fee
- ✓Specialists in rear extension flat roofs on Victorian and Edwardian properties
| Work | Typical range | Factors |
|---|---|---|
| Flat roof patch repair | £200 - £500 | Patch size, accessibility |
| Small flat roof replacement (up to 15m²) | £1,500 - £3,000 | Material choice (EPDM vs GRP) |
| Medium flat roof replacement (15-30m²) | £3,000 - £5,000 | Insulation, drainage work |
| Large flat roof replacement (30m²+) | £5,000 - £8,000 | Access, structural work |
Comprehensive flat roof solutions.
Leaks and Standing Water
Thorough inspections to find the source of leaks and provide a lasting repair.
Blistering and Cracking
Complete re-roofing services to replace old felt with a durable, modern system.
Punctures or Tears
Professional patch repairs to restore the watertight seal.
Aged or Perished Materials
A full replacement with a new, highly durable flat roof system.
Failed Joints or Seals
We specialise in repairing and resealing joints on modern flat roof systems.
New Installations
Expert installation of brand new flat roofs for extensions, garages, and new builds.
Three steps. No surprises.
Most roofers vanish between the quote and the invoice. We don't. Here's exactly how a job goes from your call to a finished roof.
Free survey & inspection
We come out, climb up, and look at your roof properly — no obligation, no hard sell, no call-out fee. You get a plain-English assessment of what we found and what (if anything) needs doing.
Itemised written quote
A written quote with materials, labour, scaffolding and timeline broken out line by line. We name our materials and our suppliers — no mystery line items, and no deposit required.
The job, properly done
The same lead tradesman from quote to handover. Site cleaned daily, neighbours considered, and a 10-year insurance-backed guarantee handed over once you're happy.
Is Your Flat Roof in Need of Repair?
Leaks or Water Stains
The most obvious sign of a problem, often appearing on the ceiling below the flat roof.
Pooling or Standing Water
Water that sits on your flat roof for more than 48 hours indicates improper drainage.
Visible Damage
Look for cracks, blisters, bubbles, or tears in the flat roof membrane.
Sagging Roofline
A sagging flat roof can indicate a major structural problem or waterlogged decking.
Moss or Plant Growth
Extensive growth can trap moisture and cause the membrane to deteriorate.
Increased Energy Bills
An old or poorly installed flat roof can lack proper insulation, leading to heat loss.
Trade is full of uncertainty. We remove it.
"South West London's period roofs demand specialist knowledge — from Victorian slate to lead valleys and heritage chimneys. We've built our team around getting it right first time, every time."
10-year insurance-backed warranty
Independently underwritten — covers materials and workmanship even if we cease trading.
No deposit. Ever.
You pay on completion, against a finished job you've signed off. Not before.
Fully certified · £2m PLI
CHAS-accredited and fully insured, on every job we take on.
The true cost of cheap work.
A low quote for a flat roof can be tempting, but poor workmanship isn't just cosmetic — it can lead to serious, expensive problems.
Incorrect Drainage
Leads to standing water, which puts stress on the membrane and causes leaks.
Substandard Materials
Cheap materials won't stand up to British weather, leading to premature failure.
Poorly Sealed Joints
Joints that aren't sealed correctly can open up and allow water to get in.
Bad Edge Detailing
Poorly installed flashing can cause water to seep behind the membrane and rot the decking.
Lack of Insulation
Overlooked insulation leads to heat loss and higher energy bills.
Everything you need to know about flat roof.
Flat roof guides covering materials, costs, maintenance tips, and comparisons to help London homeowners make informed decisions.
Things people often ask.
Can't find what you're looking for? Call us on 0203 633 9159 — we answer in person, including evenings and weekends.
Jobs like yours.
"They cleaned up after themselves better than any other tradesperson I've ever used. The flat-roof extension hasn't leaked once since they re-did it eighteen months ago."
"Kitchen extension flat roof had been patched three times by other roofers. HRS stripped it all off, fitted EPDM with proper drip edges and outlets. Two years on, bone dry. Should h…"
"Rear addition flat roof replaced with GRP fibreglass. They also fixed the parapet capping that was letting water behind the render. Whole job done in two days. Very pleased."
Available across South West London.
Other ways we can help.
Same day response, every time.
Whether it's a leaking valley at 2am or a planned re-roof for next spring, we're the same call. Phone or WhatsApp us, or visit our Lavender Hill workshop.
London SW11 1LJ
Office hours: 7am–7pm