Free UK construction cost estimator

Build Hub's free cost estimator gives an instant, indicative budget for UK building projects — extensions, loft conversions, refurbishments and new builds — using 2026 UK benchmark data adjusted for your postcode region and property type. You get a low–mid–high cost range, a confidence score, and the assumptions and exclusions behind the figure.

How the estimate works

Enter your project type, size and postcode. The estimator applies regional pricing multipliers and project-specific cost drivers, then returns a transparent range rather than a single fixed number — real construction costs depend on ground conditions, specification, access and finishes. For typical prices by project and region, read our UK cost guides, or see real project case studies.