07447 188036info@gnbroofing.co.uk Serving East AngliaMon–Sat 7am–6pm HomeAboutServicesFlat Roof InstallationFlat Roof ReplacementFlat Roof RepairsEPDM Rubber RoofingSingle-Ply Membrane (SFlex · Sika Plan · Resitrix)Commercial Flat RoofingFascias & Soffits (UPVC)Guttering & BargeboardsCladding — UPVC, Timber-Effect & Composite AreasNorfolk NorwichThorpe St Andrew & SprowstonHellesdonCostesseyTaverhamDraytonCringlefordWymondhamDerehamGreat YarmouthThetfordKing's Lynn County overview Norfolk (county overview)Suffolk (county overview)Cambridgeshire (county overview) Our WorkReviewsContact07447 188036Get Free Quote - Home - Services - Commercial Flat Roofing Commercial Flat Roofing # Commercial Flat RoofingAcross Norwich &East Anglia Warrantied, long-life commercial flat roofing — installed by a Sika Plan Approved contractor, scheduled around your operations, priced fixed with no day-rate creep. Get my free fixed-price quote 07447 188036 Free survey · No call-out fees · Written quote in 3–4 days · You deal with Neil directly Flat-roofing specialist Sika Plan Approved Installer 20-yr product / 10-yr workmanship PL & EL fully insured Free fixed-price quotes Service overview ## What we do, who it's for, and when to book it. ### What it is Design, replacement and refurbishment of commercial flat roofs on offices, retail units, industrial and warehouse buildings, using Sika Plan, SFlex, Resitrix and EPDM systems. ### Who it's for Facilities managers, property owners, landlords and tenants who need a warrantied roof from an approved installer — with insurance-grade paperwork and phased delivery. ### When it's needed When a building's roof is past its design life, when insurers or a survey have flagged it, when leaks are affecting operations, or at planned refurbishment. ### Why it matters Commercial roofs are risk assets. Downtime, stock damage, and public-liability exposure all sit on the roof's shoulders. Cheap patchwork typically costs more than a warrantied re-cover across even three years. The cost of leaving it ## What actually happens when this is put off. ### If it's ignored - A single storm-driven leak into a stock area can cost more than the entire re-cover would have. - Insurance premiums climb once a roof is 'known' to leak — and cover can be restricted at renewal. - Deck saturation accelerates once water is trapped between failed coverings, doubling the cost of eventual replacement. ### Common mistakes we clean up after - Choosing on price without checking the installer's manufacturer approval — the paperwork is where the warranty lives. - Repeated patch contracts that never fix the root cause and rack up more spend than a proper replacement. - Ignoring roof access and edge-protection standards — a real liability at any HSE-relevant site. Our process ## A predictable path from first call to guaranteed sign-off. - 01 Free survey & report Deck and covering inspection, condition report, and honest recommendation. - 02 Fixed written quote & phasing plan Named system, fixed price, and a work sequence that fits around your operations. - 03 Strip and substrate prep Staged so the building stays weather-tight through each phase. - 04 Warm-roof build-up & membrane install Insulation and membrane installed to manufacturer specification, with correct fixings/adhesive for the exposure. - 05 Manufacturer sign-off & guarantee System inspected and warranty issued, plus our 10-year workmanship guarantee in writing. What you actually get ## The outcomes — not the sales talk. Sika Plan Approved contractor Manufacturer system warranty on approved installs. Scheduled around your operations Phased delivery so trading, stock or production isn't disrupted. Insurance-grade paperwork Specifications and reports in a format your insurer and any surveyor will accept. PL & EL fully insured Full public and employer liability cover on every job. Fixed price, no day-rate creep The quote you sign is what you pay. Direct-to-owner service Neil is your point of contact throughout. Specification detail ## The technical honest version. Commercial roofing decisions live at the intersection of technical spec, operational disruption, and insurance risk. Here's how each factor is handled. ### System selection for commercial exposure Sika Plan and SFlex mechanically fixed systems are our default for large exposed roofs; fully adhered where visual finish matters. ### Refurbishment vs replacement Sometimes a scarf-in over sound existing insulation is right; sometimes full strip is the honest call. Survey decides — not sales pressure. ### Working around operations Warehouse and retail work is phased so each area stays weather-tight overnight and access is maintained. ### Edge protection & HSE Full edge-protection scaffolding or mansafe systems as required by the risk assessment. ### Rooflights, plant and penetrations AC units, extract fans, cable trays and rooflights all need proper collars and upstands — priced in from day one. ### Warranty and documentation You get the manufacturer system warranty, our written 10-year workmanship guarantee, and full spec/photography records for insurance and any future sale. Frequently asked ## Questions we answer at almost every survey. Can you work around business operations?+Yes — phased work is standard on commercial. We'll agree the sequence and access arrangements with you at contract stage. What warranties do commercial clients get?+Manufacturer system warranty on approved installs (typically 20 years product) plus our 10-year written workmanship guarantee. Do you handle insurance claims?+We can quote in a format your insurer will accept and provide the condition reports and photography needed for claim documentation. Do you work with facilities managers and MDs directly?+Yes. You'll deal with Neil throughout — one decision-maker, one point of contact. How disruptive is a commercial re-cover?+Managed correctly, minimally. Phased strip-and-cover means you're weather-tight each evening and trading continues. Do you cover industrial and warehouse roofs?+Yes, alongside offices, retail units and multi-tenant buildings across Norfolk, Suffolk and Cambridgeshire. Do you cover the whole of Norfolk, Suffolk & Cambridgeshire?+Yes. We're based in Norwich (NR5) and work across Norfolk, Suffolk and Cambridgeshire — including all the Norwich suburbs (Thorpe St Andrew, Sprowston, Hellesdon, Costessey, Taverham, Drayton, Cringleford), Wymondham, Dereham, Thetford, Great Yarmouth and King's Lynn. If you're on the edge of that area, phone and ask — we don't charge to travel to quote. Do you charge call-out fees?+No. Surveys and quotes are free, and there are no call-out fees. You get a fixed written price before any work starts — no day-rates, no hidden extras. Who will I actually deal with?+Neil, the owner, personally quotes and runs every job. You won't be handed to a call centre or a subcontracted crew. One point of contact from first call to final sign-off. Where we cover ## Commercial Flat Roofing across Norfolk, Suffolk & Cambridgeshire. NorwichThorpe St Andrew & SprowstonHellesdonCostesseyTaverhamDraytonCringlefordWymondhamDerehamGreat YarmouthThetfordKing's LynnNorfolk (county overview)Suffolk (county overview)Cambridgeshire (county overview) Related services ## Also worth looking at. Single-Ply Membrane (SFlex · Sika Plan · Resitrix) Premium single-ply membrane systems — SFlex, Sika Plan and Resitrix — installed by a Sika Plan Approved contractor with the extended manufacturer warranty that comes with it. View service Flat Roof Replacement Strip the failed covering, put the deck and falls right, upgrade the insulation, and re-cover in a manufacturer-warranted system — for a fixed price with a 20-year product guarantee and a 10-year workmanship guarantee. View service Flat Roof Repairs Track down the actual leak, fix it properly, and tell you honestly whether repair or replacement is the right call — with no call-out fee and a fixed written quote in 3–4 days. View service One next step ## Get a fixed written quote for your commercial flat roofing — in 3–4 days. Free survey. No call-out fees. Sika Plan Approved. 20-year product / 10-year workmanship guarantee. Neil quotes it and Neil installs it. Book my free survey Call 07447 188036 Mon–Sat 7am–6pm Flat-roofing specialists serving homes and businesses across East Anglia. Sika Plan Approved. Fully insured. Owner-run by Neil Cockman. Sika Plan Approved Installer ### Services - Flat Roof Installation - Flat Roof Replacement - Flat Roof Repairs - EPDM Rubber Roofing - Single-Ply Membrane - Commercial Flat Roofing - Fascias & Soffits ### Service Areas - Norwich - Thorpe St Andrew & Sprowston - Hellesdon - Costessey - Taverham - Drayton - Cringleford - Wymondham - Dereham - Great Yarmouth - Thetford - King's Lynn - Norfolk (county overview) - Suffolk (county overview) - Cambridgeshire (county overview) ### Contact - 07447 188036 - info@gnbroofing.co.uk - 6 Gilbard RoadNorwich, NR5 8TR - Mon–Sat 7am–6pm · Closed Sun © 2026 GNB Roofing Services. All rights reserved.Privacy PolicyCookie PolicyTerms & Conditions Call NowGet Free Quote We use essential cookies to make this site work, and optional ones only if you accept. Cookie policy. AcceptReject