HomeServices Areas We CoverOur WorkAboutReviewsBlogContact07415 302 589Get a Free Estimate - Home - Services - Flat RoofsFlat Roof Specialists — North London # Flat Roof Installation Built to Last Decades, Not Just Years Stop wasting money on temporary fixes. We install flat roofing systems that eliminate leaks, reduce energy bills, and add measurable value to your property — backed by a written guarantee. Get a Free Estimate Call Now ★ 5.0 Google Rating · 2,000+ roofs completed · Same-day estimates available 15+ Years Experience 2,000+ Jobs Completed Written Guarantee Fully Insured Same-Day Response ## What Is a Flat Roof and When Do You Need One? A flat roof is a roofing system with a pitch of less than 10 degrees, commonly found on extensions, garages, dormers, and commercial buildings across London. Unlike pitched roofs, flat roofs require specialist materials and installation techniques to prevent water pooling and ensure long-term performance. You might need a new flat roof if your existing one is leaking, sagging, showing signs of blistering, or has simply reached the end of its lifespan. Many flat roofs installed in the 1970s and 1980s used basic felt systems that were never designed to last more than 10–15 years. If yours is older than that, it's almost certainly costing you money in heat loss and water damage. At AC Roofing & Carpentry Ltd, we install modern flat roofing systems including EPDM rubber, GRP fibreglass, and high-performance felt. Each system is selected based on your property type, budget, and expected lifespan — not what's cheapest for us to install. Whether it's a residential extension in Islington, a garage in Hackney, or a commercial unit in Camden, we deliver flat roof installations that perform for 25 years or more. Every installation includes proper drainage design, insulation upgrades where applicable, and a written workmanship guarantee. Real Work ## See Our Flat Roofs Projects View all our completed roofing projects ## What Happens When You Ignore a Failing Flat Roof? A flat roof that's past its prime doesn't just leak — it causes a chain reaction of expensive problems. Water ingress penetrates the deck boards, rots the timber joists beneath, and creates damp conditions that travel through ceilings and walls. Within months, you're dealing with structural damage, mould growth, and compromised insulation. Many homeowners try to extend a failing flat roof's life with patches and sealants. These temporary fixes rarely last more than one winter. They also hide the real damage happening underneath, meaning by the time you address the root cause, the repair bill has doubled or tripled. Ignored flat roof issues also drive up heating costs. A poorly insulated or water-damaged flat roof can account for up to 25% of heat loss in a property. That's hundreds of pounds wasted every year on energy bills alone. The longer you wait, the more it costs. A simple re-cover that might cost £1,500 today could become a full deck replacement at £4,000+ if the timber rots through. Acting early saves money, protects your property, and eliminates the stress of emergency repairs. How We Work ## Our Proven 5-Step Flat Roof Process 1 ### Survey & Assessment We inspect the existing roof, measure up, and assess the deck condition — no guesswork. 2 ### System Selection We recommend the best material (EPDM, GRP, or felt) based on your property and budget. 3 ### Deck Preparation We strip the old roof, replace any damaged timber, and prepare a clean, solid deck. 4 ### Installation Your new flat roof is installed with proper falls, sealed edges, and correct drainage. 5 ### Final Check & Guarantee We water-test, photograph the finished work, and issue your written guarantee. Why It Matters ## Why a New Flat Roof Pays for Itself ### 25+ Year Lifespan Modern EPDM and GRP systems last two to three times longer than traditional felt. ### Zero Leak Risk Properly installed flat roofs with seamless membranes eliminate water ingress entirely. ### Lower Energy Bills New insulation boards fitted as standard reduce heat loss by up to 25%. ### Added Property Value A certified flat roof installation adds demonstrable value when selling or remortgaging. ### Minimal Disruption Most residential flat roofs are completed in 1–2 days with no interior access needed. ### Written Guarantee Every job comes with a written workmanship guarantee — your investment is protected. ## Flat Roofing Systems: A Complete Technical Guide ### EPDM Rubber Roofing EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber membrane that has become the gold standard for residential flat roofing. It's supplied in large single sheets, which means fewer joints and virtually zero leak points. EPDM is UV resistant, handles temperature extremes from -40°C to +120°C, and has a proven track record of lasting 40+ years in real-world conditions. We use Firestone RubberCover and ClassicBond systems, both of which carry manufacturer guarantees of 20 years. EPDM is ideal for extensions, garages, dormers, and any flat roof up to around 60m². ### GRP Fibreglass Roofing GRP (Glass Reinforced Plastic) creates a completely seamless, rigid finish that's walked-on durable. It's applied as a liquid resin over glass fibre matting, curing to form a single waterproof shell with no joints or seams. GRP is the preferred choice for balconies, walkways, and any flat roof that needs to withstand foot traffic. It's also highly resistant to impact, chemicals, and moss growth. Our GRP installations include proper trim details, drip edges, and a topcoat that can be colour-matched to your property. Expected lifespan is 30–40 years with zero maintenance required. ### High-Performance Felt Roofing Modern torch-on felt systems are a significant step up from the old pour-and-roll method. They use modified bitumen membranes with polyester or fibreglass reinforcement, applied with a gas torch for a heat-welded bond. While felt doesn't last as long as EPDM or GRP (typically 15–20 years), it's a cost-effective option for budget-conscious projects. We recommend three-layer felt systems with a mineral cap sheet for maximum durability. Felt remains a solid choice for garages, sheds, and outbuildings where the budget doesn't stretch to rubber or fibreglass. ### Residential vs Commercial Flat Roofs Residential and commercial flat roofs share the same physics but differ in scale, access requirements, and material specification. Commercial flat roofs are typically larger, may need to support plant equipment or foot traffic, and often require single-ply membrane systems like TPO or PVC for larger spans. Residential flat roofs are generally smaller and more suited to EPDM or GRP. We handle both — from a single garage roof in Finsbury Park to multi-unit commercial buildings in Hackney. Our team is experienced with the specific challenges of each, including fire rating requirements, building regulations compliance, and access logistics. ### Insulation and Building Regulations Under current building regulations, any flat roof replacement must meet minimum thermal performance standards (U-value of 0.18 W/m²K or better). This means fitting rigid insulation boards — typically PIR (Polyisocyanurate) — either above or below the deck. Warm deck construction (insulation on top) is the industry standard because it keeps the deck warm, prevents condensation, and maximises the roof's lifespan. We handle all building control notifications and ensure every installation is fully compliant. Upgrading your insulation isn't just a legal requirement — it makes a noticeable difference to your heating bills from day one. Common Questions ## Frequently Asked Questions ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">How much does a new flat roof cost in London? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">How long does a flat roof installation take? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Which flat roof system is best — EPDM, GRP, or felt? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Do you offer a guarantee on flat roof work? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Can you replace a flat roof without scaffolding? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Will I need building regulations approval? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">How do I know if my flat roof needs replacing? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Do you work across North London? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Can you add insulation when replacing a flat roof? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Is there anything I need to do to prepare? ## Protect Your Property Today Speak to our team for honest advice and a no-obligation estimate. Most quotes delivered within 24 hours. Get Your Free Quote 07415 302 589 ### Related Services - Flat Roof Repair - Felt Roofs - Fibreglass Roofs - Rubber Roofs - Roof Replacements ### Areas We Serve IslingtonHackneyCamdenHampsteadFinsbury ParkArchwayHarringayMuswell Hill ← Home·All Services·Free Estimate·Our Work·Reviews Professional roofing services across North London. Quality workmanship, fair prices, guaranteed results. 07415 302 589 info@acroofingandcarpentry.co.uk 106 Dartmouth Park Hill, London N19 5HT FMB MemberTrustATrader - Roofing Services Flat Roof Installation - New Roof Installation - Roof Repairs London - Roof Replacement Service - Emergency Roof Repairs - Commercial Roofing London - Fascia & Soffit Replacement - Loft Conversion Roofing - Gutter Replacement - Flat Roof Repairs - Felt Roof Installation - Fibreglass Roof London - Rubber Roof Installation Areas We Cover - Roofer in Islington - Roofer in Hackney - Roofer in Camden - Roofer in Hampstead - Roofer in Finsbury Park - Roofer in Archway - Roofer in Harringay - Roofer in Westminster - Roofer in Muswell Hill - Roofer in Belsize Park - Roofer in Swiss Cottage Company - About AC Roofing - Customer Reviews - Roofing Portfolio - Roofing Blog - Current Offers - Get a Free EstimateGuides - Spot Roof Damage Early - New Roof Cost Guide 2026 - Flat vs Pitched RoofPrivacy PolicyTerms & ConditionsCookie Policy © 2026 AC Roofing And Carpentry Ltd. 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