Extension Cost Estimator

If you would like to get an idea of what an extension might cost before paying out for architects and planning fees then this tool can be used to estimate the approximate cost of your extension plans.

Instructions for Use

Fill out your areas below in m² for the different parts of the extension. Click “Calculate Price” and you will be shown a price range which you should expect your extension costs to fall within. A copy will also be sent to your email address.

Gross External Area M2

Extension to the Ground Floor

Extensions Above Ground Floor

Conversion of Loft Space

Extensions that will be a Garage

Areas that require Refurbishment

Your Information

Your Name

Email Address

Telephone Number

House Name/Number