Price building workwith confidence.

Guide prices and detailed estimates.

  • Try your first Guide Price for free
  • Clear early budget ranges in minutes
  • Itemised Detailed Estimates from architectural drawings
  • Pricing shaped by real builder experience
  • Assumptions, exclusions and omissions made clear

No sales calls. No pressure. Just clear pricing to help you plan.

New estimateGuide or detailed

Guide: Try free / £9.99 inc VATDetailed: £29.99 inc VAT

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Proper Job guide price generated on iPhone

Two ways to price your project

Start with a quick Guide Price. Add a full Detailed Estimate when your decisions and drawings are ready.

Guide Price creates a clear early range from key job details.

Paid Detailed Estimate combines architectural drawings with Proper Job’s real-world pricing engine for itemised job pricing.

  • Create clear guide prices in minutes
  • Build detailed estimates from architectural drawings
  • Keep assumptions, exclusions and important decisions visible

Start better budget conversations earlier. Read more · Watch the demo.

More time for what matters. Create guide prices in minutes, not evenings.

See a Guide Price from start to finish.

UK building cost calculator

Estimate building work costs before you ask for quotes.

Proper Job helps you create an early guide price for house extensions, loft conversions, kitchen renovations, bathroom renovations, refurbishments, basement work and lower-ground floor projects. It uses the job type, size, location, finish and likely associated work—not one generic price per square metre.

When your decisions and architectural drawings are ready, a Detailed Estimate can turn the measured information into itemised work packages with assumptions, exclusions and open decisions kept visible.

How the building cost calculator works

Example jobs

See example prices before you start.

See how we calculate building work prices by exploring these example jobs.