Complete flat roof replacement in GRP fibreglass or EPDM rubber. 25-year material guarantee. Canterbury and East Kent specialists. No more patching — replace properly. Free surveys.
GRP · EPDM · 25-year material guarantee · Canterbury specialists
Canterbury has a large volume of flat roof extensions — the rear kitchen and dining room additions that were added to Victorian and Edwardian terraces throughout the 20th century. Many of these were last recovered in felt in the 1970s or 1980s and are now well beyond their design life. The Stour valley's above-average rainfall and humidity means felt flat roofs in Canterbury deteriorate faster than the same specification on drier inland sites, and repeated patching becomes more expensive than a proper replacement within a few years.
GRP fibreglass is the material we specify for the majority of Canterbury flat roof replacements. Its seamless single-piece installation eliminates the joint failures that are the primary cause of felt leaks. It handles Canterbury's rainfall loading without pooling. The 25-year manufacturer's material guarantee provides genuine long-term protection. On larger flat roof sections — typically over 40m² — we assess EPDM rubber as an alternative, which can be more cost-effective on very large areas while still providing a 20-year guarantee.
Rear extension flat roofs on Victorian and Edwardian terraces across Wincheap, St Dunstan's and Hales Place. Garage flat roofs on post-war and 1960s–70s properties in Barton, Rough Common and Thanington. Single-storey rear additions on semi-detached housing throughout the Canterbury CT1/CT2 area. Dormer flat roof sections on Victorian and Edwardian loft conversions. Bay window top sections on period properties throughout the city.
“Felt flat roof on the rear kitchen extension had been patched three times. Canterbury Roofing replaced it in GRP. It has been bone dry through two wet Canterbury winters. Excellent work.”
“Garage flat roof was completely saturated — the felt had gone. Full GRP replacement in a day. The difference in drainage is obvious, no more pooling water.”
“Large flat roof over the Victorian rear addition. They assessed it properly, recommended GRP over the quote they gave for EPDM on the larger area. Honest advice and a clean finish.”
All prices are guides — we always provide a free, itemised quote before any work begins. No hidden fees.
Minor tile work to full valley repairs
Full re-roof, materials and labour
GRP, EPDM or felt, size dependent
Clean, repair or full replacement
Repointing, flashing, pot replacement
Same-day response, 24/7 availability
A full GRP fibreglass flat roof replacement on a standard rear extension in Canterbury typically costs £900–£2,200 depending on area. Garage flat roofs are £700–£1,800. Large flat roof sections over single-storey rear additions on Canterbury's Victorian and Edwardian terraces typically run £1,200–£3,000. GRP carries a 25-year material guarantee. EPDM rubber is a slightly lower-cost option at £700–£1,800 for the same extension size with a 20-year guarantee.
GRP fibreglass is the recommended specification for Canterbury. It handles the above-average Stour valley rainfall better than felt, its seamless installation means no joints to fail, and it is significantly more durable in Canterbury's damp conditions. EPDM rubber is a solid alternative for larger flat roof areas where GRP installation becomes more complex. We do not recommend felt as a long-term solution on Canterbury properties and will not install it as a new roof covering.
A standard rear extension flat roof in Canterbury takes 1–2 days for GRP installation including preparation, resin application and curing time. Larger sections or those requiring structural repairs take longer. We provide a realistic timeline in the quotation.
Canterbury's Stour valley position creates above-average annual rainfall and humidity compared to surrounding higher ground. Flat roofs in Canterbury collect standing water more readily than pitched surfaces, and the combination of high rainfall and valley humidity accelerates felt membrane degradation — particularly on the large number of 1970s and 1980s extension flat roofs across the city's housing stock. GRP or EPDM replacement is the correct long-term solution.
In most cases yes. Flat roof replacement is carried out from the exterior and does not require internal access unless there is structural damage to the roof deck itself, which we assess on the free site visit. We protect garden areas and clear all debris as part of the installation.
No call-out fees. No obligation. An honest quote from a local Canterbury roofer who turns up when they say they will.
0122 763 4920 Email Us Instead