GRP fibreglass, EPDM rubber and felt flat roofing for extensions, garages and outbuildings across Ely. 25-year systems with proper drainage.
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📞 Call Now: 0122 366 6465Flat Roofing in Ely covers ponding water that sits for more than day or two after rain and more, with clear written quotes and a 10-year workmanship guarantee. Prices start around £800. Call 0122 366 6465 for a free Ely survey.
Flat roofs in Ely face heavier rainfall and more persistent wind-driven rain than those in sheltered locations. The fenland terrain offers no protection — water arrives horizontally as well as vertically. We specify minimum 1:40 falls on all Ely flat roofs and use EPDM or GRP systems rated for sustained standing water, because even a well-designed flat roof in Ely will hold surface water during heavy fenland downpours.
Most flat roof calls from Ely are for ageing felt roofs on garages and rear extensions across the Highflyer estate and along Downham Road. Original felt from the 1970s–80s has a 10–15 year life — most are now decades overdue for replacement. We strip back to the deck, repair or replace the timber boards, and install GRP or EPDM with a 25-year guarantee.
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0122 366 6465We strip the old membrane and inspect every board. In Ely, the exposed fenland winds with no natural shelter means deck deterioration is possible if the old membrane has been leaking — we check every square inch of Ely flat roof replacements.
We calculate the correct fall for your specific roof — minimum 1:40, achieved with tapered insulation boards where the existing deck is flat. For Ely properties, proper drainage is critical given the exposed fenland winds with no natural shelter.
EPDM or GRP is installed to manufacturer specification. For Ely, we typically recommend the system best suited to each specific application — EPDM for garages, GRP for walkable surfaces.
Edge trims, upstand flashings and drainage outlets are finished to a standard that handles Ely's conditions. You receive the 10-year guarantee and maintenance guidance specific to your chosen system and Ely's climate.
"EPDM rubber roof on the garage — old felt had been patched so many times it looked like a patchwork quilt. New roof done in a day. Clean, professional, watertight."
"GRP flat roof on our kitchen extension. They stripped the old felt, found the boards were soft from years of leaks, replaced them and laid new GRP. Transformed the extension."
"Small flat roof over the back door had been leaking for ages. They fitted an EPDM membrane with a proper drip edge in a few hours. No more wet shoes in the hallway."
Flat roofs fail in predictable ways. If your garage, extension or dormer roof shows any of these, it is time to look at repair or replacement.
When it is not the answer: If the deck is sound and the covering is only locally split, a repair or overlay is cheaper than a full replacement — we will tell you honestly which yours needs. Read the full guide.
Most flat roofs are low and reached from towers; scaffold is added only for extension roofs at height or with parapets. Scaffold is specified for: first-floor extension roofs, parapet detailing, and any flat roof over a storey up - always itemised in your written quote, never a hidden extra, and we arrange it.
Ely's historic core near the Cathedral has tight lanes and conservation-area constraints that shape access and materials. Pavement scaffold and skip permits go through East Cambridgeshire District Council; allow a few working days on streets like Forehill, Silver Street, the lanes near the Cathedral where space is tight.
| Job | Typical range | Notes |
|---|---|---|
| Single garage roof (EPDM) | £800 – £1,500 | Best value for garages |
| Single garage roof (GRP) | £1,000 – £1,800 | Harder wearing |
| Large garage / outbuilding | £1,500 – £2,500 | Per size & deck |
| Extension flat roof (EPDM) | £2,000 – £4,500 | Damp-area choice |
| Extension flat roof (GRP, walkable) | £2,500 – £6,000 | Walkable surface |
| New timber deck (per m², if needed) | £40 – £70 | Only if deck has failed |
Worked example: Replacing a single-garage felt roof on the Arbury estate, ~18m², with new EPDM, trims and a new deck where needed, typically runs £1,100–£1,600. A 35m² walkable GRP roof over a Romsey Town kitchen extension with a rooflight kerb is nearer £3,500–£4,500.
No deposit on garage roofs under £1,500; you pay on completion. Larger roofs are staged after materials are on site. VAT included.
Covering CB6, CB7 and surrounding postcodes.
Our flat-roof workmanship is guaranteed for 10 years, on top of the 20–25 year manufacturer material warranties on EPDM and GRP.
If a fault appears in covered work, we come back and put it right. No quibbling, no re-charge.
BS 6229, the British Standard for flat roofing, requires a minimum finished fall of 1:40 so water drains within a reasonable time — ponding that lingers beyond 48 hours is the leading cause of premature flat-roof failure.
Source: BS 6229:2018
A typical garage flat roof in Ely costs £800–£2,500 depending on the system. Extension roofs range from £2,500–£6,000. We provide free quotes for all jobs.
Both perform well in Ely's fenland climate. GRP gives a harder-wearing, walkable finish — ideal for balconies. EPDM is lighter and better suited to larger roof areas like garages. We recommend the best option for each specific job.
Most garage flat roofs in Ely are completed in 1 day. Larger extension roofs take 2–3 days. Weather can affect timing — GRP cannot be installed in rain.
Well-installed modern flat roofs don't leak. Problems occur with old felt roofs past their life, or poorly installed systems with inadequate drainage. We design every Ely flat roof with proper falls to handle fenland rainfall.
Signs include: standing water that doesn't drain within 48 hours, bubbling or cracked membrane, soft or spongy areas when walked on, and visible splits at joints or edges. If your felt roof is over 15 years old, it's likely past its useful life.
Yes. All flat roof installations carry our 10-year workmanship guarantee. GRP and EPDM systems also have manufacturer warranties of 20–25 years.
Yes. Tapered insulation boards can be fitted above the deck during replacement, improving both drainage and thermal performance. This is especially worthwhile during a full flat roof replacement.
Ely's exposed fenland position means roofs face persistent easterly winds with no natural shelter — wind speeds are consistently 15–20% higher than in the sheltered Cambridge basin. For flat roofing, this means fenland wind drives rain horizontally under tiles at angles that would cause no problems in a sheltered location — every repair specification must account for this exposure.
The city's housing spans medieval properties near the Cathedral, Georgian townhouses on St Mary's Street, Victorian terraces along Broad Street, and large post-war estates including the Highflyer development stretching north.
We carry wind-rated fixings and specify mechanical tile clips rather than mortar bedding as standard for all Ely work — essential in this exposed position. Ely is 16 miles north-east from our Cambridge base — close enough for same-day response on urgent work and regular maintenance visits.
We use two flat roofing systems in Ely: EPDM rubber membrane (1.2mm Firestone or ClassicBond) and GRP fibreglass (Scott Bader resin with 450gsm mat). For Ely properties facing exposed fenland winds with no natural shelter, we recommend the system best suited to each application based on access needs and deck condition.
The deck beneath the membrane determines how long the roof lasts. We use 18mm WBP plywood for GRP installations — never OSB, which flexes and causes GRP to crack. In Ely, we inspect every board and replace any that show softness, delamination or rot before the new membrane goes on. A flat roof is only as good as what is underneath it.
We are here seven days a week to help with your roofing needs. Whether it is a quick question, a free survey or an emergency that cannot wait, call 0122 366 6465 and speak to our Cambridge team directly. No call centres, no automated menus — just a local roofer who knows your area and will give you an honest answer.
No call-out fees. No obligation. Just an honest quote from a local Ely roofer who'll turn up when they say they will.
0122 366 6465