Flat Roofing Oxford for Flat Roof Repairs, Replacement and EPDM Roofs
Professional flat roofing in Oxford for extensions, garages, dormers, porches and commercial properties, from a single leak to a complete flat roof replacement.
We install long-life EPDM rubber and modern felt flat roofs, with a free survey and a fixed written quote before any work starts.
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Flat Roofing in Oxford That Keeps the Water Out
Need a flat roofer in Oxford? Premier Roofing Oxford repairs and replaces flat roofs on extensions, garages, dormers, porches and commercial buildings across Oxfordshire. We install EPDM rubber and modern felt systems. A new flat roof typically costs £50–£90 per m² for EPDM, and most garage and extension roofs are completed in one to two days.
We have been working on Oxford roofs for over a decade and are rated 4.9★ from 190+ Google reviews. A well-built flat roof has a slight fall that moves rainwater to an outlet or gutter. When the covering, drainage or edge detailing fails, water sits on the roof or creeps under the membrane, and that is when leaks, damp patches and rot begin. We fix the cause, not just the symptom.
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Flat Roof Repairs, Replacements & New Roofs
From a single leak to a complete new roof, we work on domestic and commercial flat roofs across Oxford and Oxfordshire.
Flat Roof Repairs
Splits, blisters, failed seams, lifted edges and leaks around outlets or upstands found and repaired, often without replacing the whole roof.
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Flat Roof Replacement
Old felt or failing coverings stripped back, decking checked and replaced where needed, and a new long-life membrane installed.
Learn more →EPDM Rubber Roofing
A single seamless sheet of EPDM rubber with a 30–50 year expected life, ideal for extensions, garages and larger flat roofs.
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Felt Flat Roofing
Modern torch-on and cold-applied felt systems, a cost-effective option that is easy to patch-repair later.
Learn more →Garage Flat Roofs
Leaking or sagging garage roofs repaired or replaced, including new decking and a fresh EPDM or felt covering.
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Extensions, Dormers & Porches
Flat roofs for kitchen extensions, dormers, porches and bay windows, finished neatly with trims, upstands and flashings.
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Which Flat Roofing System Is Best?
The best flat roof material depends on the roof size, shape, drainage, how the space below is used and your budget. For most Oxford homes we recommend EPDM rubber: it is laid as one seamless sheet, handles hot summers and freezing winters, and needs very little maintenance.
Modern felt is the budget-friendly choice and is easy to repair in sections. GRP fibreglass suits roofs with heavy foot traffic or complex shapes. You do not need to choose before calling us: we inspect the roof and recommend the right system.
| EPDM rubber | Modern felt | GRP fibreglass | |
|---|---|---|---|
| Typical cost | £50 – £90 per m² | £40 – £70 per m² | £80 – £130 per m² |
| Expected lifespan | 30 – 50 years | 10 – 20 years | 25 – 40 years |
| Joints | One seamless sheet | Overlapping layers | Seamless once cured |
| Best for | Extensions, garages, larger roofs | Budget jobs, small roofs | Walkable roofs, complex shapes |
| Repairs | Easy patch repairs | Easy patch repairs | Specialist resin repairs |
We install EPDM rubber and modern felt systems. If your roof is already GRP, we can inspect it and advise on the best way to repair or replace it.
How Much Does a Flat Roof Cost in Oxford?
A new flat roof in Oxford typically costs £50–£130 per m² depending on the system, or around £1,500–£7,500 for most homes. Typical prices include removing the old covering, preparation, the new system and finishing.
| Flat roof job | Typical cost |
|---|---|
| Flat roof patch repair (felt, EPDM) | £200 – £700 |
| Porch or bay window roof (5–8m²) | £800 – £1,500 |
| Garage flat roof (about 15m²) | £1,200 – £2,400 |
| Extension flat roof (20–25m²) | £1,800 – £3,500 |
| Large extension roof (35–45m²) | £3,000 – £6,500 |
| EPDM rubber, per m² | £50 – £90 |
| Felt, per m² | £40 – £70 |
See our full guide: Flat roof replacement cost in the UK
Signs Your Flat Roof Needs Attention
Flat roofs rarely fail overnight. Water usually gets in at a seam, edge or outlet and travels under the membrane before it shows inside, so spotting the early signs can save the decking and the ceiling below.
Flat Roofs for Every Type of Building
Flat roofing is used on many parts of Oxford homes and businesses. We repair and replace flat roofs on:
Repair or Replace Your Flat Roof?
A flat roof can often be repaired rather than replaced. We only recommend replacement when repairs no longer make sense, and we show you photos so you can decide.
A repair is usually right when…
- The damage is limited to one area, seam or edge
- The covering is generally sound and well bonded
- The decking underneath is dry and solid
- The roof is well within its expected lifespan
Replacement is worth considering when…
- Leaks keep returning in different places
- The felt is cracked, blistered or past 15–20 years
- The decking is soft, wet or rotten
- You want a longer-lasting EPDM system and better insulation
Our Flat Roofing Process
Simple, transparent and with no surprises, from survey to a watertight roof.
Tell Us About the Roof
Share details and photos by phone, WhatsApp or the quote form.
Free Survey
We check the covering, seams, edges, outlets, drainage and decking.
Fixed Written Quote
A clear recommendation and price, with no hidden extras or upfront fees.
Expert Installation
Careful detailing at edges, upstands and outlets, and a tidy site when we finish.
Flat Roof Leaking Right Now? We Can Help.
A leaking flat roof can quickly damage ceilings, insulation and decking. We make the roof safe first, then quote for a permanent repair or replacement.
- Send photos on WhatsApp for quick advice
- Temporary make-safe to stop water getting in
- Permanent repair or replacement quoted
- Photos and a written report for insurance claims
Flat Roofing Across Oxfordshire
Flat roof repairs and replacements in Oxford, including Headington, Cowley, Summertown, Jericho, Botley and Marston, and towns right across the county. Need a different roofing job? See our roof repairs in Oxford.
Buying a House in Oxfordshire?
Know the condition of the roof before you commit. Our pre-purchase roof inspection includes photos, video and clear repair costs.
- Full Roof Assessment
- Chimney & Gutter Check
- Structural & Tile Inspection
- Leak Detection
Only £375 + VAT
Available across Oxford & Oxfordshire
Certified & Accredited
Flat Roofing FAQs
How much does a flat roof cost in Oxford?
A new flat roof in Oxford typically costs £50–£130 per m². EPDM rubber is around £50–£90 per m², felt £40–£70 and GRP £80–£130. A garage roof of about 15m² is usually £1,200–£2,400 and an extension roof of 20–25m² around £1,800–£3,500. We give a fixed written quote after a free survey.
How much does a flat roof repair cost?
Most flat roof patch repairs cost £200–£700, depending on the size of the damage, the roof covering and access. If the decking underneath is wet or rotten, a partial or full replacement may be better value, and we will explain the options.
What is the best flat roof material in the UK?
For most homes, EPDM rubber is the best all-round choice: it is a single seamless sheet, lasts 30–50 years and needs little maintenance. Felt is cheaper but typically lasts 10–20 years, and GRP fibreglass suits walkable roofs or complex shapes. We recommend the right system after inspecting your roof.
How long does a flat roof last?
Expected lifespans are around 30–50 years for EPDM rubber, 25–40 years for GRP fibreglass and 10–20 years for felt. Good installation, drainage and edge detailing make a big difference to how long any flat roof lasts.
Can a flat roof be repaired rather than replaced?
Yes. If the damage is limited to one area, seam or edge and the decking underneath is dry and sound, a flat roof can usually be repaired. If leaks keep returning or the decking is soft or rotten, replacement is often the better long-term option.
What causes a flat roof to leak?
A leak can develop from deterioration of the roof covering, damaged seams, splits, failed flashing, problems around roof edges or outlets and water sitting on the roof for long periods. Water can move beneath the covering before it becomes visible inside, so finding the true entry point is important.
What are the warning signs that my flat roof needs attention?
Common warning signs include cracks, splits or blistering, standing water after rain, lifted edges or flashings, soft spots underfoot, damp marks on the ceiling below and leaks that return in heavy rain.
How long does it take to replace a flat roof?
Most garage and extension flat roofs are replaced in one to two days, and larger roofs typically take two to four days. Flat roofing needs dry weather, so we confirm the timing in your quote and plan around the forecast.
Do you install flat roofs on extensions and garages?
Yes. We repair and replace flat roofs on house extensions, garages, dormers, porches, bay windows, outbuildings and commercial properties across Oxford and Oxfordshire.
Do I need to add insulation when replacing a flat roof?
In most cases, replacing more than a quarter of a flat roof counts as renovating it under Building Regulations, which usually means the insulation needs upgrading at the same time. We will advise on the right build-up and include it in your quote.
Our Other Roofing Services in Oxford
Explore the full range of roofing work we carry out for homes and businesses across Oxford and Oxfordshire.
Book Your Free Flat Roof Survey
Honest advice, photos of your roof and a fixed price, with no upfront fees. Mobile 0777 535 9399 · [email protected]