Estimating residential construction and building reinstatement costs in the UK requires accounting for sharp material shifts post-Building Safety Act and the updated Approved Document Part L regulations.

2026 Core UK Rebuild Rates per Square Foot

For home insurance reinstatement and self-build budgeting, typical core construction rates across mainland UK currently range between:

  • Terraced Houses: £165 to £240 per sq ft (£1,775 – £2,585/m²)

  • Semi-Detached Houses: £175 to £265 per sq ft (£1,880 – £2,850/m²)

  • Detached Homes: £190 to £295 per sq ft (£2,050 – £3,175/m²)

These rates exclude site clearance and professional fees, which typically add £10,000–£25,000 for demolition and 10%–15% for architectural and structural engineering sign-offs.

To run interactive multi-stage material take-offs and check regional cost multipliers, refer to the complete UK house rebuild cost calculator and the comprehensive cost to rebuild a house per square foot UK guide.

Extension & Masonry Rules of Thumb

For domestic extensions, key trade benchmarks include:

  1. 1.

    Cavity Wall Estimating: Outer leaf facing brickwork requires approximately 60 bricks/m², alongside 10 concrete blocks/m² for the thermal inner leaf.

  2. 2.

    Drywall & Plastering: A standard 25kg bag of gypsum drywall adhesive covers 3.5 to 4 boards (approx. 10m²), while Thistle MultiFinish covers 10m² at a standard 2mm skim.

More detailed coverage tables and calculators can be explored at BuildingCosts.co.uk.