GRP fibreglass and EPDM flat roofing specialists in Corsham. Experienced with conservation area planning requirements and the specific drainage challenges of rear extensions on period properties. Free no-obligation quotes.
In short: Flat Roofing in Corsham: Flat roofing runs £900–£2,500 for a typical extension. We cover Corsham and the surrounding SN13 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.
Flat Roofing in Corsham — What Makes This Location Different
Local Climate and Exposure
Corsham's conservation area and Bath stone properties retain moisture differently to modern brick — damp penetration from failed mortar is faster on porous limestone. For flat roofing work in Corsham, this means specification choices that reflect the actual conditions rather than generic Wiltshire averages.
Housing Stock Profile
Victorian and Edwardian terraces on the High Street and Lacock Road dominate the repair profile. We are 3 miles west from Corsham — 8 minutes — with no travel surcharge and same local knowledge that applies to every property type in this area.
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Failing felt flat roofs are best replaced in GRP or EPDM rather than patched in Corsham. Corsham is a Bath-stone conservation town — honey-coloured ashlar terraces, stone-slate and clay roofs, and the historic weavers' cottages around the High Street and Pickwick. On this kind of stock, the common problems are failed lime pointing on Bath-stone stacks, slipped stone slates, and conservation-grade repairs on the listed cottages — and knowing which you are dealing with is the difference between a lasting fix and money wasted.
National roofing standards illustrated. We advise on your specific Corsham roof after a free survey.
Local Knowledge
Flat Roofing on Corsham Properties
Flat roofing in Corsham's conservation area requires some additional thought around planning. Single-storey rear extensions on listed or conservation area properties may need prior approval — particularly if the extension itself didn't have consent, or if the proposed roofing material changes the visible roof profile. We advise on planning implications during the free survey before any specification is agreed.
The most common flat roofing call from Corsham is rear extension flat roofs on Victorian and Edwardian properties — typically felt roofs installed 20–40 years ago during extension work, now reaching or beyond end of life. We replace these in GRP fibreglass as standard, which carries a 25-year material guarantee and is the most durable option available. Drainage correction is included on every installation — ponding extensions are a common discovery during survey.
We remove the old covering and inspect the deck for rot — the step most quotes skip.
2. Correct the falls
We check and correct drainage falls so water runs off cleanly rather than ponding.
3. Written quote
A fixed price covering deck repairs, membrane and trims, agreed before work starts.
4. Install the membrane
GRP is laid wet and cures seamless; EPDM is bonded as one sheet. Trims and upstands dressed in.
5. Sign-off & guarantee
The finished roof carries a 25-year material guarantee (GRP) plus our workmanship cover.
Timescales
How Long Flat Roofing Takes
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.
Access
Access, Scaffold & Permits in Corsham
Corsham's stone-built town-centre terraces have no rear access and sit in a conservation area, so materials pass over the front and matching stone slate or natural materials are often required. Pavement scaffold and skip permits in Corsham go through Wiltshire Council; on tight streets like Pickwick Road, the High Street, Priory Street we allow extra time for setup and access.
Pricing
Flat Roofing Prices in Corsham
Flat roofing runs £900–£2,500 for a typical extension. Corsham pricing tracks Chippenham, adjusted for access on Corsham'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 SN13 and surrounding postcodes.
Guarantee
Your Corsham Guarantee
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.
Covered: workmanship for 10 years, in writing, transferable.
On top: manufacturer warranties on materials.
Not covered: storm or impact damage — an insurance matter we document for you.
Good to know
Disruption, Mess & Weather
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. Corsham sits on the higher ground west of Chippenham, exposed to the prevailing south-westerlies coming off the Bath hills.
Local knowledge
Why Choose a Local Corsham Roofer
Knowing Corsham means knowing its roofs. Corsham is a Bath-stone conservation town — honey-coloured ashlar terraces, stone-slate and clay roofs, and the historic weavers' cottages around the High Street and Pickwick. We have worked on this stock for years, so we recognise failed lime pointing on Bath-stone stacks, slipped stone slates, and conservation-grade repairs on the listed cottages on sight, quote accurately the first time, and do not need to guess at what is behind the covering. Corsham sits on the higher ground west of Chippenham, exposed to the prevailing south-westerlies coming off the Bath hills. — local knowledge that goes straight into how we specify and price the work.
Being local also means we are there when you need us, we understand how scaffold and skip permits work with Wiltshire Council, and our reputation depends on the Corsham jobs we do. Every job is backed by a free survey, a written itemised quote with no call-out fee, and our 10-year workmanship guarantee — whether you are in the town centre or the surrounding SN13 villages. Call 01249 247 076 or book a callback.
Customer Reviews
What Corsham Homeowners Say
★★★★★
"Felt flat roof on Victorian terrace extension failing after 25 years. Replaced with GRP — done in a day, excellent finish on the upstands. Also corrected the drainage fall that was causing ponding. No issues through two winters."
H. Barker · Lacock Road, Corsham
★★★★★
"New GRP roof on rear single-storey extension. Permitted development — they confirmed planning status during the survey. Clean installation, watertight from day one."
P. James · School Road, Corsham
★★★★★
"Large L-shaped flat roof on a converted outbuilding done in EPDM. Neat upstand detailing, good drainage. Far better than the felt it replaced."
L. Vincent · Neston, near Corsham
FAQ
Flat Roofing Corsham — Questions
Like-for-like flat roof replacement doesn't normally require consent. New flat roof extensions or changes to roof profile on listed or conservation area properties may need prior approval. We advise on planning status during the free survey — don't start work without checking.
GRP fibreglass is our first recommendation — seamless, 25-year material guarantee, and excellent performance on small to medium domestic extensions. EPDM is better suited to very large or complex roof shapes. We advise based on your specific roof geometry.
GRP fibreglass up to 20m²: £1,200–£2,500. EPDM up to 20m²: £900–£1,800. All prices include strip, deck inspection, drainage correction and installation. Free written quote before any work starts.
Corsham is 3 miles from Chippenham — we can typically offer a free survey within 2–3 working days and emergency assessments same-day.
GRP fibreglass carries a 25-year material guarantee and typically exceeds 40 years in service when correctly installed. Corsham's relatively sheltered position compared to higher-ground Wiltshire towns is favourable for flat roof longevity.
Like-for-like flat roof replacement doesn't normally require consent. New flat roof extensions or changes to visible roof profile on listed or conservation area properties may need prior approval. We advise on planning status during the free survey before any specification is agreed.
GRP fibreglass is our standard recommendation for Corsham domestic extensions — seamless, rigid, and excellent under foot traffic. EPDM is better suited to very large roofs with complex geometry. We specify the right system for your roof shape and drainage requirements.
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