How much does a flat roof cost in Merthyr Tydfil (2026)?
A new EPDM rubber or GRP flat roof costs about £70–£120 per m² in Merthyr Tydfil. A single garage is usually £1,200–£2,000.
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Last updated 27 October 2026
Short answer: EPDM rubber costs about £70–£110 per m², GRP fibreglass £80–£120 per m² and torch-on felt £60–£95 per m², fitted, including VAT. A 15 m² garage is usually £1,200–£2,000 and a 20 m² rear extension £1,800–£3,000.
New flat roof prices
| Job | Typical price |
|---|---|
| EPDM rubber20–30+ year lifespan | £70–£110 per m² |
| GRP fibreglass25–30+ year lifespan | £80–£120 per m² |
| Torch-on felt (3 layers)15–25 year lifespan | £60–£95 per m² |
| Single garage (about 15 m²)Strip, new deck, EPDM or GRP | £1,200–£2,000 |
| Rear extension (about 20 m²) | £1,800–£3,000 |
| Dormer roof | £1,000–£2,200 |
| New deck boards, if rottenOnly known once the old roof is off | £25–£40 per m² |
Typical prices from local roofers in Merthyr Tydfil, including VAT, last reviewed October 2026. A guide only: the roofer’s written quote is what you pay.
Flat roof repair prices
| Job | Typical price |
|---|---|
| Patch repair on a sound deck | £150–£500 |
| Re-seal edges, trims and upstands | £200–£600 |
| Liquid coating over a sound roofExtends life; not a fix for a wet deck | £40–£80 per m² |
| Replace a rotten section of deck | £300–£900 |
Typical prices from local roofers in Merthyr Tydfil, including VAT, last reviewed October 2026. A guide only: the roofer’s written quote is what you pay.
What affects the price
- The deck. If the boards under the old roof are wet or rotten, they need replacing at about £25–£40 per m². Nobody can be sure until the old roof is off.
- Insulation. Building regulations usually require insulation to be brought up to standard when a roof is replaced. A warm-roof build adds cost but cuts heat loss.
- Edges and upstands. Roofs that meet walls, windows or a pitched roof need more detailing.
- Size. Small roofs cost more per m² because setting up, trims and travel are a bigger share of the job.
- Access and waste. Getting materials through a terraced house or over a garden wall takes longer.
Which system gives the best value?
Felt is cheapest to fit, but EPDM and GRP usually last 10–15 years longer, so the cost per year is often lower. Our EPDM vs GRP vs felt guide compares them, and the flat roofing page explains what the work involves.
Flat roof costs: questions people ask
How much do flat roof repairs cost?
A small patch repair on a sound deck usually costs £150–£500. Re-sealing edges and upstands is often £200–£600. If the deck underneath is wet or soft, a repair will not last and a new roof is usually better value.
How much does a rubber roof cost in the UK?
A professionally fitted EPDM rubber roof usually costs £70–£110 per m², including stripping the old roof. A single garage of about 15 m² is typically £1,200–£2,000, and a 20 m² rear extension £1,800–£3,000.
Why is EPDM so expensive?
It is not much dearer than good felt, but the cost includes more than the rubber: stripping the old roof, new deck boards where needed, insulation, adhesives, edge trims and upstands, and skilled labour. The membrane itself is a small part of the price. A longer life also makes the cost per year lower than felt.
What is the cheapest way to cover a flat roof?
Torch-on or built-up felt has the lowest upfront cost, at about £60–£95 per m², and a liquid coating over a sound roof can be cheaper still as a short-term fix. Over 20–30 years, EPDM or GRP often works out cheaper because they last longer.
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