Flat roofs
Flat roofing in Oxford
EPDM rubber, GRP fibreglass and traditional felt — repairs, replacement and warm roof build-ups.
Free survey, photos and a written quote. 10/10 from 189 Checkatrade reviews.
Flat roofs fail at the edges, the outlets and the joints long before the membrane wears out. We survey for all three, then tell you honestly whether a repair will hold or whether the roof is at the end of its life.
We install and repair flat roofs on garages, extensions, bay windows, dormers and small commercial buildings across Oxford and Oxfordshire.
Why flat roofs leak
- Membrane damage from age or weather
- Failed flashings around edges and penetrations
- Inadequate drainage causing water to pool
- Structural movement creating cracks
- Poor installation by a previous contractor
- Blocked outlets backing water up under the membrane
Water travels. The stain on the ceiling is rarely directly under the hole, which is why we survey the whole roof rather than only the spot you can see.
Choosing a flat roof material
No single material suits every roof. The honest trade-off is between cost now and lifespan later.
- EPDM rubber — excellent durability and value for most residential roofs
- GRP fibreglass — best where the roof takes foot traffic
- Torch-on felt — cost-effective for larger areas
- Warm roof build-ups, where insulation goes above the deck
What it costs
Guide ranges. Access, roof size and whether the deck needs replacing all move the number.
confirm 2026/27 prices
Get a price for your roof| Work | Typical range | Usual time |
|---|---|---|
| Garage roof, EPDM or felt | £600 – £1,500 | 1–2 days |
| Small extension or bay | £800 – £2,000 | 2–3 days |
| Large house roof | £2,000 – £4,000 | 3–5 days |
| Small commercial roof | from £5,000 | Project |
| Localised repair | £150 – £500 | Half a day |
Flat roofing questions
Still unsure? Call 07468 429000 and describe it. We will tell you whether it needs looking at.
Traditional felt typically lasts 10–15 years. EPDM rubber systems last 40–50 years. Fibreglass GRP can exceed 30 years with minimal maintenance. Regular inspection and prompt minor repairs extend any roof's life significantly.
Membrane damage from age or weather, failed flashings around edges and penetrations, poor installation, inadequate drainage causing water to pool, and structural movement creating cracks. Most leaks start small and get worse, so inspections catch problems before they cause interior damage.
Small localised damage usually repairs easily and cost-effectively. Widespread deterioration, several leaks, or a roof over 20 years old often justifies complete replacement. We give an honest assessment at the free survey and only suggest replacement when it is the better long-term value.
Most flat roof repairs and replacements do not need planning permission if you are maintaining the existing structure. New installations or significant height changes may. Conservation areas and listed buildings have additional restrictions.
Most flat roofing can proceed year-round. EPDM works in most conditions, torch-on felt needs dry weather, and fibreglass needs temperatures above 5°C to cure. We schedule around the forecast.
Yes — written workmanship guarantees, and material warranties are passed on to you.
Still to be confirmed by the client
- Do you guarantee flat roof work? — the guarantee period, and the EPDM / fibreglass material warranty terms
Flat roofing across Oxford and Oxfordshire
Request a free survey
Tell us what you have noticed and where you are. We reply within one working day.
Leaking right now? Call 07468 429000 rather than sending the form — active leaks get priority.