Romsey's Victorian and Edwardian housing stock was not designed with flat-roofed extensions in mind — but the postwar and 1960s extension boom added kitchen, dining and utility flat roofs to a large proportion of the town's properties. Those extensions, built on the felt standards of their era, are now 40–60 years old. Most have been re-felted once already; many are now on their second or third felt system. The Test Valley's above-average moisture levels mean felt lifespan in Romsey runs toward the lower end of the national range — typically 10–12 years rather than 15.
GRP fibreglass is the flat roofing system we recommend for most Romsey domestic properties. The seamless liquid application eliminates the joint failures that cause felt to leak; the 25-year manufacturer warranty gives genuine confidence; and GRP's performance in standing water is significantly better than felt — important in a Test Valley location where drainage from flat extensions can be less than perfect.
GRP Flat Roofing for Romsey Victorian and Edwardian Properties
Romsey's period stock generates specific flat roofing requirements around rear outrigger extensions — the single-storey rear projections common on Victorian and Edwardian terraces along The Hundred, Church Street and Palmerston Street. These outrigger roofs are typically small (10–20m²) but carry a disproportionate maintenance burden because of their age and the moisture load from the valley location. We install GRP on these outrigger roofs as a permanent solution. Where the outrigger structure has any conservation area relevance, we advise on material appropriateness at survey stage.
EPDM Rubber for Larger Romsey Properties
For larger flat roof areas on Romsey detached and semi-detached properties — double garages, large rear extensions — EPDM rubber in a single fully-bonded sheet eliminates joints entirely. Sheets up to 12m wide cover most domestic flat roofs in one piece. EPDM carries a 20-year manufacturer warranty and sits between torch-on felt and GRP in cost. We specify the right system for each property and include both options in quotes where applicable.
Free flat roof survey in Romsey. We inspect, advise on the right system and provide a written, fixed-price quote. Call 01962 809171.
Flat Roof Costs in Winchester (2025)
| Flat Roof Type | Typical Cost |
|---|---|
| GRP fibreglass — extension (20m²) | £1,800–£2,800 |
| GRP fibreglass — garage | £900–£1,600 |
| EPDM rubber — large extension | £1,600–£3,200 |
| Deck replacement (if required) | £150–£450 add |
| GRP manufacturer warranty | 25 years |
What a Flat Roof Survey Involves
We survey the existing membrane from the roof surface — checking for blistering, cracking, joint failure and drainage falls. We inspect the deck boards at the edges and any accessible areas for softness or delamination. We check the outlet drainage and confirm the fall direction. The written survey report confirms whether repair is appropriate or whether replacement is the better value decision, with costings for both options where repair is viable. Deck replacement cost, where required, is confirmed before work starts — not discovered and charged afterwards. Free survey and written fixed quote. Call 01962 809171.