GRP fibreglass and EPDM flat roofing specialists in Malmesbury — extensions, garages and outbuildings. Correct drainage, proper upstand detailing, 25-year material guarantee. Free no-obligation quotes.
Tell us the job in 30 seconds. No pushy sales, no call-out fee.
📞 Call Now: 01249 247 076In short: Flat Roofing in Malmesbury: Flat roofing runs £900–£2,500 for a typical extension. We cover Malmesbury and the surrounding SN16 area with free quotes, no call-out fee, and a 10-year workmanship guarantee. Failing felt flat roofs are best replaced in GRP or EPDM rather than patched.
All flat roofing work across Malmesbury and surrounding Wiltshire — same local team, same standards, same guarantee as our Chippenham base.
Seamless, UV stable, 25-year material guarantee. Our standard recommendation for domestic extensions. Installed in one day on most standard roofs.
Get a quote →Better suited to large or complex roof shapes with significant thermal movement. 20-year material guarantee. Excellent performance on wide-span outbuildings.
Get a quote →Budget flat roofing option. Shorter lifespan than GRP or EPDM but appropriate where cost is the primary constraint. We advise honestly on expected service life.
Get a quote →Included on every flat roof replacement. We inspect boards before laying the new membrane — rotten or damaged deck is replaced as part of the same visit.
Get a quote →Ponding flat roofs have a fall problem, not just a membrane problem. We correct drainage falls as standard on every flat roof replacement — not just relay over the existing profile.
Get a quote →Sudden flat roof failure causing active water ingress. Same-day temporary seal available. Permanent GRP replacement scheduled within the week.
Get a quote →Malmesbury's exposed hilltop position — the highest town in Wiltshire — means stronger wind loading and faster mortar fatigue than any valley location in our coverage area. For flat roofing work in Malmesbury, this means specification choices that reflect the actual conditions rather than generic Wiltshire averages.
Medieval and Georgian town centre properties require conservation-appropriate materials; 1960s–80s estates below the hill use standard modern specifications. We are 10 miles north from Malmesbury — 20 minutes — with no travel surcharge and same local knowledge that applies to every property type in this area.
Free quotes. No call-out fees. 20 minutes from Chippenham.
Failing felt flat roofs are best replaced in GRP or EPDM rather than patched in Malmesbury. Malmesbury is England's oldest borough — a hilltop town of Cotswold-stone cottages, stone-slate and clay roofs, and a dense historic conservation core around the Abbey. On this kind of stock, the common problems are exposed stone-slate roofs losing slates to wind, lime-pointing failure on Cotswold-stone stacks, and heritage repairs on listed stock — and knowing which you are dealing with is the difference between a lasting fix and money wasted.
Flat roofing in Malmesbury is concentrated on the 1960s–80s estate housing below the historic hilltop — particularly on the south-facing extensions that receive the strongest UV exposure. Felt failure through blistering is more common on Malmesbury's estates than in sheltered valley towns due to the elevated position and direct sun exposure. GRP replacement is the correct solution.
The medieval and Georgian town centre occasionally has flat-roofed outbuildings within the conservation area. These require careful specification — GRP is generally acceptable on non-visible rear surfaces, but visible flat roofs in the conservation area may require lead or torch-on felt to match historic character. We advise on planning requirements during the free survey.
We remove the old covering and inspect the deck for rot — the step most quotes skip.
We check and correct drainage falls so water runs off cleanly rather than ponding.
A fixed price covering deck repairs, membrane and trims, agreed before work starts.
GRP is laid wet and cures seamless; EPDM is bonded as one sheet. Trims and upstands dressed in.
The finished roof carries a 25-year material guarantee (GRP) plus our workmanship cover.
| Job | Typical duration |
|---|---|
| Small extension (GRP, up to 15m²) | 1–2 days |
| Standard extension (GRP) | 2–3 days |
| Garage roof (EPDM) | 1 day |
| Deck / board replacement | +half to full day |
| Larger / commercial flat roof | per assessment |
GRP needs dry conditions to cure; we won't lay fibreglass in rain, so winter jobs are weather-scheduled.
Malmesbury's hilltop stone streets are steep and narrow with no rear access, and the conservation area often requires natural stone slate and lime mortar. Pavement scaffold and skip permits in Malmesbury go through Wiltshire Council; on tight streets like the High Street, Gloucester Street, Oxford Street we allow extra time for setup and access.
Flat roofing runs £900–£2,500 for a typical extension. Malmesbury pricing tracks Chippenham, adjusted for access on Malmesbury's stock.
| Job | Typical range | Notes |
|---|---|---|
| GRP small extension (up to 15m²) | £1,200–£1,800 | 25-year guarantee |
| GRP standard extension (15–25m²) | £1,800–£2,500 | Seamless fibreglass |
| EPDM standard extension | £900–£1,800 | Single bonded sheet |
| Garage roof (GRP or EPDM) | £800–£1,600 | Per garage |
| Deck / board replacement | £150–£400 | Where timber has gone soft |
| Larger / commercial flat roof | from £45/m² | Single-ply or GRP |
No deposit on jobs under £500. On larger flat roofs, no payment before materials are on site. VAT included. Payment on completion once tested and dry.
Covering SN16 and surrounding postcodes.
GRP carries a 25-year material guarantee and EPDM 20 years; our workmanship cover sits on top, and the deck and falls — which decide longevity — are guaranteed too.
A day or two of work over a single room, minimal internal disruption; we clear the old felt and all waste on completion. You do not need to stay home for external work.
EPDM can go on year-round; GRP needs a dry weather window. We temporary-weatherproof if rain interrupts a job. Malmesbury's hilltop position between two branches of the Avon leaves it fully exposed to wind on all sides.
"GRP flat roof replacement on extension — done properly, first time. Dry for two winters. Free quote was accurate and no hidden additions."
"Extension flat roof had been leaking for years. Previous roofer patched it twice. These stripped and replaced with GRP. Finally resolved."
"Garage flat roof replaced in EPDM — large complex shape, handled correctly. Clean job, good price."
GRP fibreglass up to 20m²: £1,200–£2,500. EPDM up to 20m²: £900–£1,800. Includes strip, deck inspection, drainage correction and installation. Free written quote — call 01249 247 076.
Malmesbury is 10 miles north — 20 minutes. No travel surcharge. Free surveys and quotes.
GRP fibreglass carries a 25-year material guarantee and significantly outlasts felt. It's seamless once cured, handles thermal cycling well, and doesn't suffer the joint failures common on felt. We recommend GRP over re-felting in almost all cases.
A standard single-storey extension flat roof up to 25m² is typically completed in one day. Larger or more complex roofs may take two days. We give an accurate timeline in every quote.
Yes — garages, outbuildings and garden buildings are a regular part of our flat roofing work in Malmesbury. Same specification and 25-year guarantee as domestic extensions.
If the roof is more than 20 years old and showing active failure, replacement is almost always more cost-effective than repair. We survey and advise honestly — we won't recommend replacement if targeted repair genuinely meets the situation.
GRP fibreglass carries a 25-year material manufacturer's guarantee plus our own 10-year workmanship guarantee. EPDM carries a 20-year material guarantee. Both are provided in writing on completion.
No call-out fees. No obligation. Local roofer covering all of Wiltshire.
01249 247 076Last updated: August 2026