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Flat roof replacement cost calculator

Estimate the cost of replacing a flat roof — EPDM, GRP or felt — based on your property. Instant indicative figure, then a fixed quote from a vetted roofer.

No contact details needed Instant estimate Typical UK pricing

Flat roof replacement cost calculator

Scoped to flat roofs. Pricing depends mainly on the system and the area covered.

Figures are indicative UK ranges, last reviewed June 2026. A fixed price needs a free roof survey.

Bedrooms — a proxy for roof size

Flat-roof systems compared

  • EPDM rubber (around £75–£110/m²). The current mid-range standard. Single-sheet rubber membrane, typically lasting 25–35 years. The best all-round value for most flat roofs.
  • GRP fibreglass (around £85–£120/m²). A seamless fibreglass layer, well-suited to smaller areas like porches and extensions. Lifespan around 20–25 years.
  • Felt / torch-on (around £40–£65/m²). Cheapest upfront but shortest-lived at roughly 10–20 years. Often a false economy on a roof you intend to keep.
Building Regulations note: current Building Regulations usually require insulation upgrades ("warm deck" construction) when a flat roof is fully replaced, which adds a little per square metre. Your roofer will advise what's needed for your roof.

Flat roofs are common on extensions, dormers and garages. Because these are usually smaller sections than a whole pitched roof, the calculator biases the area down when you pick a flat roof on a house — a survey confirms the exact size.

This is an indicative estimate based on typical UK pricing. A fixed price needs a free roof survey from a local roofer.