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Advanced Flat Roofing Systems in London
Flat roofing has come a long way from the bitumen-felt installations of the 1980s that gave the format its bad name. Today's GRP fibreglass, EPDM rubber and single-ply membrane systems easily last 25 to 40 years when installed by trained specialists — and they're often the smartest, most cost-effective roofing choice for rear extensions, dormers, garages, balconies and commercial properties across the capital.
At Roofers in London, we install advanced flat roofing London homeowners and businesses can rely on, choosing the right system for the building, the budget and how the roof will be used. Our flat roofing services in London cover everything from a small kitchen-extension roof in Lambeth to a large single-ply commercial reroof in Tower Hamlets.
Why Choose This Service
Flat roofs do a tougher job than they look. Without proper falls, drainage, perimeter detailing and substrate preparation, even the most expensive material will fail.
Most of the flat-roof problems we get called to fix in London are not material failures — they're installation failures. Our flat roofing service is built around getting those fundamentals right: laser-checked falls, manufacturer-approved detailing, proper insulation, and finishes that integrate cleanly with rainwater goods, parapet walls and roof lights.
Key Benefits
- Wide system choice — GRP, EPDM, TPO, PVC single-ply, modified bitumen and cold-applied liquid systems
- Manufacturer-approved installers — your warranty stays valid
- Walk-on, terrace, balcony and warm-roof specifications available
- Improved insulation to current Part L Building Regulations U-values
- Tapered insulation systems to engineer the correct falls on flat decks
- Proper detailing into upstands, parapets, abutments and rainwater outlets
- Quiet, fume-free cold-applied options for occupied properties and offices
- 20+ year manufacturer warranties on most modern systems
- Fast installation windows — important when you're racing the weather
- Coordinated detailing with rooflights, lanterns and Velux installations
Our Process
1
Site visit and condition survey
We inspect existing falls, decking condition, perimeter detailing and outlets, and discuss how the roof will be used.
2
System recommendation
Realistic pros and cons of each suitable option — we'll say which we'd choose for your roof, and why.
3
Written quotation
Materials, falls, insulation spec, edge details and warranty terms, all priced up front.
4
Strip-back and decking inspection
We open up the existing covering and inspect the deck, replacing or reinforcing it where required.
5
Vapour control layer
Installed where the chosen system requires it to manage interstitial condensation.
6
Insulation installation
Flat or tapered, sized to deliver the U-value and falls your roof needs.
7
Membrane / system installation
By manufacturer-trained operatives — torch-on, hot-air-welded, fully bonded or cold-applied as appropriate.
8
Detail work
Upstands, drips, gutters, kerbs, rooflights, outlets — all detailed to the system manufacturer's specification.
9
Quality check and warranty documentation
Photographs of every key detail, archived for warranty purposes.
10
Handover walk-through
We walk you over the new roof, explain the maintenance requirements and leave you the warranty paperwork.
Common Problems We Solve
• Persistent leaks at upstands, abutments and around old skylights
• Ponding water due to inadequate or reverse falls
• Failed bitumen felt that has reached end-of-life
• Blistered, split or shrunken EPDM caused by poor adhesion
• Unsightly green-growth and moss accumulation on old felt roofs
• Cold roofs causing condensation and timber decay underneath
• Old garage and extension roofs that fail every winter
• Commercial flat roofs needing low-disruption refurbishment over occupied space
• Flat roofs that won't hold a manufacturer warranty because of incorrect detailing
• Roof terraces failing where the waterproofing meets the deck finish
Areas Covered Across London
We cover all 32 London boroughs plus the City of London. Our most-served areas for this service include Camden, Islington, Hackney, Hampstead, Westminster, Kensington & Chelsea, Tower Hamlets, Southwark, Lambeth, Wandsworth, Greenwich, Lewisham, Ealing, Brent, Haringey, Barnet, Enfield, Croydon, Bromley and Richmond.
We carry out flat roofing work across all London boroughs, with particular demand from kitchen-extension projects in Hackney, Islington, Lambeth and Wandsworth, and from commercial owners in Westminster, Tower Hamlets and Southwark.
Why Choose Roofers in London
• Manufacturer-trained on the GRP, EPDM and single-ply systems we recommend — so warranties remain valid
• 20+ years of London flat-roof installations — we know how London buildings move, drain and weather
• Free, detailed written quotation with full scope and warranty terms
• Manufacturer-backed warranties up to 25 years
• Fully insured with Health & Safety paperwork suitable for residential and commercial sites
• Direct relationship with the install team — no subcontracted shortcuts
• Tidy site management — important for occupied flats, offices and shops
• Dedicated post-completion aftercare and maintenance service
Frequently Asked Questions
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Q: Which flat-roofing system is best for a London extension?
A: There's no single best — it depends on the application. EPDM is excellent for residential extensions; GRP suits roofs with complex shapes; single-ply is ideal for larger spans and commercial flat roofs. We'll explain the trade-offs for your specific roof.
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Q: How long does a flat roof last?
A: Modern systems installed correctly typically last 25–40+ years. Bitumen felt is closer to 10–20 years. The installation quality matters as much as the material.
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Q: Can I walk on my flat roof?
A: Only if it's specified for foot traffic. We can install walk-on roof terraces and balcony decks with proper waterproofing, slip resistance and insulation.
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Q: How do you ensure water drains properly?
A: We check existing falls with a laser level and use tapered insulation where the existing structure is flat or has reverse falls. Proper drainage is non-negotiable.
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Q: Will the work disrupt my home or business?
A: We minimise disruption with cold-applied systems where possible (no torches, no fumes), tidy site management, and clear daily progress communication.
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Q: How quickly can you start?
A: For most jobs we can survey within a few days and start within 2–4 weeks of acceptance. Emergency leak repairs are attended same-day or next-day across London.
