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Know your numbers before you start.
A cost estimator, the verified builder directory, and plain-English guides — everything to plan a project before you speak to anyone.
Project Cost Tool
UK-wide indicative costs. No commitment. Pick a project type, size and region for a realistic range.
Project type
Size
22 m²Region
Finish level
Indicative range
Extension · 22 m² · London & SE · Mid finish
Indicative only — site conditions, materials, planning and bespoke joinery move the final figure. Not a quote.
Project base rate
Each project type carries a low / high £-per-m² band from current UK build-cost research.
Region & finish
A regional multiplier (London ~25% above average, the North ~10% below) and a finish-level multiplier.
Indicative, not a quote
A budgeting starting point. Site-specific conditions and materials will move the final figure.
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