Free UK buildingcost calculator.

Add project details for a price and breakdown.

  • Compare finishes
  • See what’s included
  • Add drawings when you’re ready

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Proper Job price generated on iPhone

Homeowners, builders and architects

Every project needs more than a square-metre rate.

Two projects with the same floor area can need very different work. Proper Job uses the job type, size, location, finish and likely associated work to calculate a price.

  • Homeowners can estimate extension costs before committing to full drawings.
  • Builders can give clients a consistent early price range.
  • Architects can test concept-stage costs before detailed cost planning.

When drawings are ready, drawing analysis uses reviewed measurements to build itemised work packages.

Read more · Watch the demo.

See the calculator from start to finish.

Built by builders

Free building budgets, guided in conversation.

Proper Job brings real-world building experience to your project budget. A compatible assistant can walk you through the project questions and call Proper Job’s calculator for a free Guide Price. Add your country, region, size and scope to compare options in local currency, with a breakdown and relevant local checks.

  • Free Guide Prices
  • Eleven countries · local currencies
  • Scope, breakdown and local checks
Use Proper Job in conversation

Free UK building cost calculator

Calculate building work costs free before you ask for quotes.

How the building cost calculator works

A price per square metre for an extension or renovation is only a rough starting point. Add the job type, size, location, property age and known work for a price; resolve design and finish choices to make that budget more specific.

With architectural drawings and a defined scope, a drawing analysis turns reviewed measurements into itemised work packages. See how the price develops.

Example jobs

See example prices before you start.

Explore calculated example jobs.