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 - AboutAbout GNB Roofing # Flat roofs that don'tcome back to hauntanyone. One specialist, one price, one guarantee. Neil Cockman personally surveys, quotes and installs every flat roof we take on across Norfolk, Suffolk and Cambridgeshire. Book a free survey 07447 188036 Our story ## A specialist trade, done properly. GNB Roofing Services is run by Neil Cockman from Gilbard Road in Norwich (NR5). Before founding GNB, Neil worked as a subcontractor on large commercial single-ply roofing projects — a background that settled him on the specific systems and detailing he now installs on every job. We help homeowners, landlords, builders and small commercial clients whose flat roof is either failing now or approaching the end of its economic life. That includes rear-extension and porch flats, garage roofs, dormers, low-pitch new-build sections, shopfronts, small offices and light-industrial units. Flat roofing is what we specialise in and what we lead with. Being a specialist means the price you get from us is priced for the system that fits your roof — not the system we happen to have on the van. We cover Norfolk, Suffolk and Cambridgeshire — from Norwich and the surrounding suburbs (Thorpe St Andrew, Sprowston, Hellesdon, Costessey, Taverham, Drayton, Cringleford) across to King's Lynn, south through Wymondham, Dereham and Thetford, and out to Great Yarmouth on the coast. Standards & guarantees ## What "properly" actually means, in writing. ### Sika Plan Approved Installer Sika audit our workmanship and back the membrane. That accreditation is why the 20-year product guarantee is real, not marketing. ### 20-year product / 10-year workmanship Every membrane system we install is registered in your name with Sika. The paperwork travels with the property if you sell. ### Fully insured — PL & EL Public Liability and Employer's Liability insurance held and current. Certificate available on request before we start. ### Free surveys, no call-out fees Survey and quote are always free. No day-rates, no hidden extras — the fixed written quote is the price. ### Written quote in 3–4 days You get an itemised, fixed-price quote in writing within 3–4 days of the survey. Decide in your own time — no pressure. ### One installer, start to finish Neil surveys, quotes and installs the job personally. No call centre, no sales rep, no subcontracted crew turning up on the day. Certified installer ## Roof Assured by Sika — Sikaplan® RoofPro Single Ply Membranes. Neil Cockman of GNB Roofing Ltd is externally trained and certified by Sika Limited to install Sikaplan® RoofPro single-ply membrane systems. This accreditation is what unlocks the manufacturer-backed 20-year product guarantee registered in your name. Certified20 Oct 2022 Valid until20 Oct 2026 Installer ID00440GF Measurable proof ## The numbers we're happy to be judged on. 100% Fixed-price written quotes 10 Areas covered across 3 counties 3–4 Days from survey to written quote 20yr Product / 10yr workmanship guarantee Flat-roofing specialist Sika Plan Approved 20yr / 10yr guarantee PL & EL insured Fixed written quotes Where we work ## Every town and county we cover across Norfolk, Suffolk & Cambridgeshire. 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) ## Ready to get a fixed price in writing? Free survey. Written quote in 3–4 days. 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