Flat roof leaking, blistering or simply past its life? We install GRP fibreglass, EPDM and felt flat roofing systems across Coventry — built to last, with proper drainage and a 10-year guarantee.
Flat roofing in Coventry uses GRP fibreglass or EPDM rubber, costing £800–£1,800 for a standard garage or extension. Both last 25+ years, far outlasting felt. We’re NFRC registered with a 10-year guarantee. Call 0247 798 1271 for a free flat roof survey.
Flat roofs on rear extensions, garages and outbuildings are one of the most common roofing calls across Coventry. The post-war housing stock — particularly in Cheylesmore, Foleshill and Hillfields — contains a large number of felt flat roofs that are now showing signs of thermal stress, blistering and water pooling.
We install GRP fibreglass flat roofing as our primary recommendation for new or replacement flat roofs in Coventry. GRP is seamless, highly durable (25+ year lifespan), and resistant to the ponding water issues that plagued older felt systems. For budget-conscious jobs, EPDM rubber offers an excellent mid-range solution. We also repair and replace existing felt systems where the deck condition makes a full overlay viable.
Foleshill, Hillfields and Cheylesmore have a high concentration of post-war properties with original felt flat roofs on rear additions. These are typically 15–25 years old and showing ageing membrane failure, blistering or lap joint failure at abutments. In most cases, a full overlay or replacement with GRP is more cost-effective than repeated felt patching.
Flat roofing prices in Coventry: small garage or porch (up to 20m2) from £800–£1,800 GRP. Standard extension flat roof (20–40m2) £1,800–£3,500 GRP. Larger or complex flat areas from £3,500–£6,000. Prices include full installation with upstands and drainage details.
Correct drainage specification is critical on Coventry flat roofs. Standing water accelerates membrane failure on every system. Every flat roof we install includes a drainage assessment and correctly specified falls — minimum 1:80 for GRP, 1:60 for EPDM. Properties in leafy suburbs like Earlsdon, Stivichall and Canley need particular attention to outlet placement to handle autumn leaf fall.
When we strip an old flat roof in Coventry, the most common findings on post-war stock are wet or delaminated plywood deck, inadequate insulation, and failed upstand detailing at abutments. We inspect and quote for deck repairs before proceeding — a new membrane over a failed deck is money wasted.
GRP fibreglass is our standard recommendation for Coventry residential flat roofs. It is seamless, has a 25+ year design life, and requires minimal maintenance. Felt has a design life of 10–15 years at best. On Coventry’s post-war housing stock, where many flat roofs have already been re-felted once or twice, GRP is the right long-term answer.
Small flat roofs from £800. Most residential flat roofs £800–£6,000 GRP installed.
No call-out fee. No obligation. Just an honest price from a local roofer.
A GRP flat roof installation typically takes one day for a standard extension or garage in Coventry. The process: strip existing covering, inspect and replace any rotten deck, prime the deck surface, lay the GRP matting, apply the resin laminate, trim and finish the edges and upstands, apply the topcoat. The roof is trafficable within 24 hours. We do not leave sites with an unfinished GRP laminate exposed overnight — a complete installation in a single day is standard practice.
Our GRP flat roofing installations carry a 10-year workmanship guarantee. The GRP system itself has a manufacturer design life of 25+ years with no maintenance requirement beyond keeping outlets clear. For Coventry's post-war housing stock, where many flat roofs have been re-felted once or twice already, GRP ends the replacement cycle — properly installed, it will outlast the property's next 25 years of Coventry weather.
A flat roof replacement is an opportunity to upgrade insulation that is rarely taken. On Coventry’s post-war housing stock, original flat roof insulation — where it exists at all — is typically 25mm of glass wool, providing virtually no thermal benefit by current standards. Installing 100mm of rigid PIR insulation as part of a flat roof replacement brings the U-value of the roof structure to near-current Building Regulations standard and reduces heat loss from that part of the building significantly. The cost addition is modest relative to the total project cost and the thermal benefit lasts the lifetime of the new roof.
Replacing a flat roof with the same or similar system on the same footprint does not require planning permission under permitted development. Adding a roof terrace, raising a parapet, or changing the roof form does require permission. Adding insulation within the existing roof build-up does not require permission. Properties in conservation areas — parts of Earlsdon and the city centre — may have restrictions on visible roof materials, though this rarely applies to flat roofs not visible from the public highway. We advise on planning requirements during every survey and will not proceed with work that requires permission without confirming its status first.
“Flat roof on our kitchen extension in Cheylesmore had been patched twice and kept failing. Full GRP overlay, done in a day, no mess inside or out. Should have done it years ago.”
“Garage flat roof in Foleshill needed full replacement. Quoted fairly, done neatly, and the GRP finish looks great. No issues at all through the first winter.”
“Had three quotes for a flat roof on a rear extension in Hillfields. These guys explained the GRP option clearly, were competitive on price and the job was done in half a day. Excellent.”
GRP fibreglass is our top recommendation for residential extensions and garages in Coventry — it's seamless, durable for 25+ years and needs minimal maintenance. EPDM is a good alternative for budget-sensitive projects. Felt is a repair option only when the deck is sound; we don't install new felt systems as a primary solution.
Blistering usually indicates delamination of the membrane. In most cases on older felt roofs across Coventry, a full GRP overlay is the right answer rather than patching. We'll assess the deck condition during a free survey and advise honestly.
A correctly installed GRP flat roof has a design life of 25+ years with minimal maintenance required. We back all our GRP installations with a 10-year workmanship guarantee.
Yes — we cover all Coventry postcodes including Cheylesmore, Foleshill, Hillfields and all surrounding areas for flat roofing installation and repair.
A standard extension or garage flat roof takes half a day to a full day. We cure and inspect the GRP before leaving. You can walk on it within 24 hours.
Yes. EPDM rubber is a good alternative to GRP for budget-conscious projects. We install both systems and will recommend the right one for your property after a free survey.
Standard flat roof replacement on the same footprint does not require planning permission. Extensions or changes to roof form may require permission — we advise during the survey.
No call-out fee. No obligation. Just an honest price from a Coventry roofer who turns up when they say they will.
0247 798 1271