UK flat roof planning tool
Flat Roof Replacement Cost Calculator
Estimate a flat roof replacement using current UK per-square-metre benchmarks for felt, EPDM, GRP and asphalt, then keep deck, insulation and regional assumptions visible.
Enter a postcode to set the cost region automatically.
Estimated flat roof replacement budget
£2,378 – £2,973Planning midpoint £2,676. Felt £50–£80/m², EPDM £80–£100/m², GRP £95–£120/m² and asphalt £50–£70/m² are sourced UK benchmarks. Deck-condition and light regional adjustments are UK Home Costs planning assumptions, while your insulation / detail allowance is kept separate.
Benchmark source: Checkatrade Flat Roof Replacement Costs, updated February 2026. Deck-condition and regional adjustments are UK Home Costs planning assumptions rather than quoted market statistics. See sources →