GRP fibreglass and EPDM rubber flat roofs for extensions and garages. 25-year systems. Covering all SO22 postcodes including Winchester, Badger Farm, Harestock.
Winchester's housing stock is uniquely diverse — Georgian and Victorian terraces and townhouses in the city centre, large Edwardian detacheds in the St Cross and St Giles Hill area, and extensive 1960s to 1980s suburban estates on the city fringes at Badger Farm, Harestock and Weeke. The historic city centre properties on Jewry Street, The Broadway and Canon Street have some of the oldest inhabited roofing in Hampshire.
Our flat roofing service covers all of SO22 — free surveys, honest assessments and no call-out fees. Call 0238 184 9628 for same-week availability across Winchester.
Call Now: 0238 184 9628 Flat Roofing Southampton →Mon–Fri 8am–6pm · Sat 8am–2pm · Emergency: 24/7
Request Free QuoteThe flat-roofed extensions and garages in Winchester span a wide age range. The oldest — on Victorian and 1930s properties — have felt systems that in some cases date from mid-20th century extensions. The most common stock is 1970s to 1990s felt, now 30 to 50 years old and well beyond its design life. In Winchester's chalk downland valley — drier than coastal areas, sharper frost cycles, the Itchen adding riverside humidity, felt deteriorates faster than in drier inland areas — the moisture cycling accelerates blistering and cracking of the bitumen.
GRP fibreglass is our primary recommendation for most Winchester residential flat roofs. The seamless installation has no joints for water to find, performs well in Hampshire's persistent wet conditions, and requires zero maintenance for 25-plus years. For standard kitchen and dining extensions across Winchester's estate housing, GRP is the most practical and cost-effective system available.
On most Winchester flat roofs we survey, the deck boards show at least some deterioration — particularly at the perimeter where the flat roof meets the wall junction, and at any ponding areas where water has repeatedly stood. We inspect the deck during survey and include all necessary board replacement in the quote before work begins. This is the most common source of unexpected costs on flat roof jobs — we eliminate it by checking before we price.
"Rear extension felt roof had been leaking every winter. GRP system installed in one day. Completely different — not a drop since. Should have done it years ago."
"They found two rotten deck boards during the survey — included them in the quote and replaced before laying GRP. No extras on the invoice. Honest work."
"Garage flat roof — original 1970s felt, completely saturated. GRP replacement, half a day. Clean finish and the guarantee gives real peace of mind."
The flat-roofed extensions and garages in Winchester span a range of ages and conditions. In chalk downland valley — drier than coastal areas, sharper frost cycles, felt systems deteriorate faster than in drier inland areas — moisture cycling accelerates blistering and membrane cracking. Most felt flat roofs in Winchester that have not been replaced in the last 15 years are now past the point where patching is economical. GRP or EPDM replacement eliminates ongoing maintenance costs in a single installation.
GRP fibreglass is our primary recommendation for most Winchester residential flat roofs under 30 square metres — seamless, no maintenance, manufacturer-backed guarantee for 25-plus years. For larger flat roof areas over 30 square metres, EPDM single-ply rubber membrane is our preferred system — it handles thermal movement across large areas better than GRP and costs slightly less. Both systems perform equally well in chalk downland valley — drier than coastal areas, sharper frost cycles.
On most Winchester flat roofs we survey, the deck boards show some deterioration — particularly at perimeter edges and any areas where water has repeatedly ponded. We inspect the deck during every survey and include all necessary board replacement in the quote before work begins. Discovering rotten deck boards after installation has started is the most common source of unexpected costs on flat roof jobs — our pre-start survey eliminates that uncertainty.
The flat-roofed extensions and garages in Winchester span a wide age range. The oldest — on Victorian and 1930s properties — have felt systems that in some cases date from mid-20th century extensions. The most common stock is 1970s to 1990s felt, now 30 to 50 years old and well beyond its design life. In Winchester's chalk downland valley — drier than coastal areas, sharper frost cycles, the Itchen adding riverside humidity, felt deteriorates faster than in drier inland areas — the moisture cycling accelerates blistering and cracking of the bitumen.
GRP fibreglass is our primary recommendation for most Winchester residential flat roofs. The seamless installation has no joints for water to find, performs well in Hampshire's persistent wet conditions, and requires zero maintenance for 25-plus years. For standard kitchen and dining extensions across Winchester's estate housing, GRP is the most practical and cost-effective system available.
On most Winchester flat roofs we survey, the deck boards show at least some deterioration — particularly at the perimeter where the flat roof meets the wall junction, and at any ponding areas where water has repeatedly stood. We inspect the deck during survey and include all necessary board replacement in the quote before work begins. This is the most common source of unexpected costs on flat roof jobs — we eliminate it by checking before we price.
Yes. We cover Winchester and all SO22 postcodes for flat roofing. Free no-obligation quotes on all work. Call 0238 184 9628.
Costs vary by property size and scope. We provide free no-obligation quotes across Winchester — call 0238 184 9628 or request a quote online.
No call-out fee for any roofing work in Winchester or SO22.
Yes. 24/7 emergency call-outs across Winchester. We aim for same-day attendance. No call-out fee.
Small extension or garage under 20m²: £900 to £1,800. Medium extension 15 to 30m²: £1,800 to £3,500. Large flat roof over 30m²: £3,500 to £6,000. All deck inspection included. Free quotes across Winchester and SO22.
Most single-storey extension and garage flat roofs in Winchester are completed in one day. Larger areas or where significant deck board work is needed may take two days. We confirm timing in the quote.
Yes. This is the ideal time — including a skylight in the flat roof replacement programme is more cost-effective than a separate return visit. We quote for skylight integration as a combined job.
Small extension or garage under 20m²: £900 to £1,800. Medium extension 15 to 30m²: £1,800 to £3,500. Large flat roof over 30m²: £3,500 to £6,000. All deck inspection included. Free quotes across Winchester and SO22.
Most single-storey extension and garage flat roofs in Winchester are completed in one day. Larger areas or where significant deck board work is needed may take two days. We confirm timing in the quote.
Yes. This is the ideal time — including a skylight in the flat roof replacement programme is more cost-effective than a separate return visit. We quote for skylight integration as a combined job.
No call-out fee. No obligation. Same-week availability across SO22.
0238 184 9628