calculator

Extension Cost Calculator

With the extension cost calculator you can get a quick, free, rough estimate of at least some of the costs involved in building extra room(s) for your house. By entering information about the extensions external size, roof type, number of storeys and the UK location, an estimate of the building cost can be found. The location of the build is needed, as costs do vary across the country and the price is weighted according to this information.

Calculator - Extension cost

Tell us about the job

£
Excludes VAT. Assumes the work is carried out by an experienced contractor with good access.
Start Over

With the extension cost calculator you can get a quick, free, rough estimate of at least some of the costs involved in building extra room(s) for your house. By entering information about the extensions external size, roof type, number of storeys and the UK location, an estimate of the building cost can be found. The location of the build is needed, as costs do vary across the country and the price is weighted according to this information.

About the Extension Cost Calculator

The online extension calculator displayed above produces approximate costs of various sizes and types of extensions plus also weights it based upon the buildings location.

The data is based upon input from a quantity surveyor on real home extensions ranging in size from 2x3m to 4x6m. Extensions outside of these sizes are likely to be less accurate.

These extension costs exclude:

  • VAT
  • kitchen/bathroom equipment
  • external works such as drainage, paths and drives
  • removal of any obstructions such as sheds and greenhouses.

It should be remembered that the extension building costs displayed are indicative only and quotations should be obtained from reputable contractors.

What is Rising Damp?

Read

What is Polished Plaster?

Read

What is Lime Plaster?

Read

Replacement uPVC Guttering

Read