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 - Areas - Costessey Norfolk · 5 minutes from our NR5 yard · Local rates, no travel loading # Flat RoofingSpecialists inCostessey Sika Plan Approved flat roof installers across Costessey and the surrounding NR5, NR8 postcodes. Free surveys, fixed written quote in 3–4 days, 20-year product / 10-year workmanship guarantee. Get my free fixed-price quote 07447 188036 Same-week survey — typically 2–3 working days across NR5, NR8 · No call-out fees · 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 Local coverage ## How we serve Costessey — properly. Costessey — both Old and New — is on our doorstep. New Costessey and Queens Hills have a large modern housing stock with low-pitch dormer flats and warm-deck detailing that often needs re-detailing rather than re-covering. Old Costessey has more traditional stock where flat porch canopies and rear extensions are the recurring calls. ### Where we cover in Norfolk NR5 (Costessey, Bowthorpe edge, Bawburgh) and NR8 (New Costessey, Queens Hills, Longwater, Ringland). ### Response times Same-week survey — typically 2–3 working days across NR5, NR8. Emergency leaks and storm damage are prioritised within our operating hours (Mon–Sat 7am–6pm). ### Costessey property types we know Modern new-build estates around Queens Hills with low-pitch dormer flats and warm-deck detailing, 1980s–90s stock through New Costessey with garage and porch flats, and older brick semis and cottages in Old Costessey with felted rear extensions. ### Common jobs in Costessey Snagging low-pitch new-build dormer leaks caused by poor perimeter detail, replacing 1980s–90s felt garage roofs at end-of-life, rear-extension flat renewals in Old Costessey, and UPVC roofline where builder-grade original has failed early. Services in Costessey ## Every service we offer is available in Costessey. ### Flat Roof Installation New-build and extension flat roofs in Costessey, installed as warm-roof build-ups to current Part L. Sika-backed guarantee. View service ### Flat Roof Replacement Strip, deck-check and full replacement for end-of-life flat roofs across Costessey. EPDM, Sika Plan or Resitrix. View service ### Flat Roof Repairs Leaks, splits, blisters and storm damage fixed on Costessey properties — with a temporary weatherproof cover if needed today. View service ### EPDM Rubber Roofing Single-sheet EPDM rubber for garages, extensions and small commercial units in Costessey. Long life, no seams over most spans. View service ### Single-Ply Membrane (SFlex · Sika Plan · Resitrix) Sika Plan, SFlex and Resitrix single-ply for larger domestic and commercial roofs in Costessey. Mechanically fixed to wind-uplift spec. View service ### Commercial Flat Roofing Retail, office, light-industrial and agricultural flat roofs across Costessey. Fully insured, Sika Plan Approved workmanship. View service ### Fascias & Soffits (UPVC) UPVC fascias and soffits fitted in Costessey — sealed, ventilated properly, and finished to match your roofline. View service ### Guttering & Bargeboards Full guttering and bargeboard runs in Costessey. UPVC systems rated for the exposure your property actually sees. View service ### Cladding — UPVC, Timber-Effect & Composite UPVC, timber-effect and composite cladding across Costessey — low-maintenance, weather-tight, and finished properly at corners and abutments. View service Why Costessey customers use us ## The concrete reasons — not a mission statement. ### Costessey is on our doorstep Our yard is in Norwich NR5. Costessey is a short drive and part of our normal working week — surveys are quick, snag returns are quick, and there is no padded travel cost on the quote. ### Flat-roofing specialist, not a general trader Flat roofing and roofline is our specialism. If the answer is a repair rather than a replacement, that's what you'll be quoted for. ### Sika Plan Approved workmanship 20-year product / 10-year workmanship guarantee, registered in your name with Sika. The paperwork travels with the property if you sell. ### One quote, one price, one installer Neil surveys, quotes and installs. Fixed written quote in 3–4 days, no day-rates, no hidden extras and no subcontractor mark-up. Local conditions ## What actually goes wrong on Costessey roofs. ### New-build low-pitch dormer snagging A lot of Queens Hills and New Costessey stock has shallow dormer flats with poor perimeter and abutment detail. Water gets in through the detail, not the membrane. We re-detail properly rather than re-cover and repeat the fault. ### 1980s–90s felt at end-of-life Felt from the estate boom is now due replacement. We strip, upgrade insulation to warm-roof spec and re-cover in EPDM or single-ply — no more like-for-like felt. ### Exposure on the western edge Roofs on the western fringe catch prevailing wind coming across open country. Membranes are fixed to the correct wind-uplift zone, not a general spec. ### Builder-grade UPVC failing early Thin, colour-fading UPVC roofline fitted by the original developer has often lost its rigidity. We refit with proper 500mm-rated UPVC and correct-gauge guttering. Our process ## A predictable path from first call to guaranteed sign-off. - 01 Free on-site survey We visit your Costessey property, get on the roof (or safely inspect it), and check the deck, falls, upstands and outlets — not just the surface. - 02 Fixed written quote in 3–4 days You get a written, itemised, fixed-price quote. No day-rates, no hidden extras, no pressure — decide in your own time. - 03 Book a slot that suits you Once you approve the quote, we agree a start date that works around you. Materials are ordered direct from Sika. - 04 Installation by Neil Neil installs the job personally with a small dedicated team. Site is kept tidy, protected and safe throughout. - 05 Sign-off & registered guarantee On completion we walk the finished roof with you, register the Sika-backed guarantee in your name and issue paperwork you can pass on if you sell. Frequently asked in Costessey ## Questions we answer at almost every Costessey survey. How fast can you reach Costessey for a leak?+Active leaks in NR5, NR8 usually get a first visit within 2–3 working days in operating hours (Mon–Sat 7am–6pm). Temporary weatherproof cover is fitted on the same visit if the leak is active, and the permanent repair is quoted in writing within 3–4 days. How much does a flat roof cost in Costessey?+We don't quote by rate card because no two Costessey properties are identical — a Victorian rear extension and a 1970s garage conversion need different membranes, insulation upgrades and detailing. Every price is a fixed written quote after a free on-site survey, so you know the number before we lift a tool. Small repairs typically start in the low hundreds; a full single-ply or EPDM replacement is priced per square metre plus upstands, outlets and any timber deck renewal. Do you offer emergency call-outs in Costessey?+Yes — for active leaks, storm damage and wind-lifted membranes we prioritise Costessey customers within our operating hours (Mon–Sat 7am–6pm). We'll get a temporary weatherproof cover in place and quote the permanent repair separately. There are no call-out fees. Are you insured and accredited to work in Costessey?+Yes. Full Public and Employer's Liability insurance, and we're a Sika Plan Approved Installer — meaning Sika inspect our workmanship and back the membrane guarantee. That accreditation applies to every Costessey job the same as anywhere else we work. Who will actually turn up at my Costessey property?+Neil, the owner, personally surveys, quotes and installs every job. You won't get passed to a call centre, a sales rep or a subcontracted crew. One point of contact from first call to final sign-off — and the person who quoted it is the person on the roof. Nearby areas ## We also cover these areas close to Costessey. Norfolk Flat Roofing in Taverham Sika Plan Approved flat roof installers across Taverham and the surrounding NR8 postcodes. Free surveys, fixed written quote in 3–4 days, 20-year product / 10-year workmanship guarantee. Norfolk Flat Roofing in Drayton Sika Plan Approved flat roof installers across Drayton and the surrounding NR8 postcodes. Free surveys, fixed written quote in 3–4 days, 20-year product / 10-year workmanship guarantee. Norfolk Flat Roofing in Norwich Sika Plan Approved installers based in NR5. Free surveys, fixed written quotes in 3–4 days, and a 20-year product / 10-year workmanship guarantee — right across the city. Or see the full list of areas we cover across Norfolk, Suffolk and Cambridgeshire — or head back to the home page. One next step ## Get a fixed written quote for your Costessey flat roof — 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