Roofing that actually keeps water out — guaranteed in writing.
Flat roofs, pitched roofs, slate and tile, dormer roofing and loft conversion roof structures across East London and the Home Counties. Done properly, with a workmanship guarantee to back it.
Most roofing problems are caused by the last roofer. We are here to fix that.
Most roofing contractors patch, bill, and move on. Lead flashing dressed incorrectly. Flat roof membranes not bonded at the upstands. Ridge tiles re-bedded in sand and cement that cracks within two winters. You get a dry ceiling for six months and then the same leak returns — or a new one starts somewhere else.
RCB approaches roofing the way we approach everything: assess the full picture, specify the right system, install it correctly, and stand behind the result. Whether you have a flat roof that has outlived its GRP or felt membrane, a pitched roof losing slates after every storm, or a loft conversion dormer that was never properly weatherproofed, we diagnose the actual cause and fix it permanently.
We carry out flat roof replacement using modern GRP (fibreglass), EPDM rubber and warm-deck build-up systems — not patch repairs over failing felt. Pitched roof work covers re-slating, re-tiling, ridge and hip repairs, leadwork, valley replacement, chimney flashing and full re-roofing. Dormer roofing and loft conversion roof structures are a particular specialism, combining roofing waterproofing with structural coordination.
What's included
A failing roof is the single biggest cause of structural deterioration in UK homes — and the most expensive to fix once water ingress takes hold
How It Works
The RCB process for this service.
Roof Inspection
We inspect your roof at close range — not from the ground. We assess the existing covering, structure, flashings, drainage and ventilation and provide a written report on condition and recommended works.
Specification & Quote
We specify the correct system for your roof type, condition and budget — with fixed costs. No vague day-rate quotes that escalate once the scaffold is up.
Works & Weatherproofing
Scaffold erected where required, existing covering stripped, structure checked and remediated if needed, new covering installed to the correct specification and standard.
Inspection & Handover
All flashings, upstands and penetrations checked and dressed. Gutters cleared and flow-tested. Workmanship guarantee issued. Full photographic record provided.
Planning & Regulations
Roofing works are generally permitted development for like-for-like replacements. Changes to roof form, height or materials in conservation areas or on listed buildings require consent. Flat roof replacement using modern membrane systems (GRP, EPDM) should comply with BS 8217 (reinforced bitumen membranes) or manufacturer-specific standards as appropriate. Warm-deck flat roof build-ups should achieve minimum U-values required under Part L of the Building Regulations where applicable. Dormer roofing on loft conversions is subject to Building Regulations approval. Structural roof works require engineer sign-off.
FAQs
Common questions.
How much does a flat roof replacement cost?
A typical domestic flat roof replacement (garage, extension or bay) costs £2,000–£6,000 depending on size and system specified. GRP (fibreglass) systems are typically £70–£100/m²; EPDM rubber systems £60–£90/m²; warm-deck build-ups for occupied spaces slightly more. RCB provides a fixed price based on measured area and confirmed specification — no open-ended day rates.
How long does a flat roof last?
A correctly installed GRP (fibreglass) flat roof typically carries a 25-year guarantee and will outlast that with proper maintenance. EPDM rubber roofs are typically guaranteed for 20 years and have a lifespan of 50+ years. Traditional felt roofs last 10–15 years at best. If your flat roof is under 20 years old and leaking, the likely cause is poor installation rather than age — something RCB will identify in our inspection.
When does a pitched roof need replacing versus repairing?
A pitched roof in generally sound condition — good battens, sound felt or membrane underlay, majority of slates or tiles intact — can usually be repaired selectively. A roof where the underlay has failed, battens are rotten, or more than 20–30% of the covering is defective is typically more cost-effective to re-roof entirely rather than repair in stages. RCB will give you an honest assessment of which approach makes financial sense for your specific roof.
What is the best flat roof system for a house extension?
For most house extension flat roofs, GRP (fibreglass) is the most popular choice — it is seamless, highly durable, low-maintenance and provides a clean aesthetic. For larger or complex flat roofs, warm-deck single-ply membrane (TPO or EPDM) may be specified. RCB will recommend the appropriate system based on roof area, falls, drainage arrangement and budget.
Do you do dormer roofing for loft conversions?
Yes. Dormer roofing is one of our core specialisms, closely linked to our loft conversion work. Dormer cheeks are typically clad in slate, tile, zinc, lead or render depending on the design and planning requirements. The dormer flat roof is waterproofed with GRP or EPDM. RCB coordinates the structural timber frame, waterproofing and external cladding as part of the full loft conversion scope.
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