We’ve used ONS data on property prices per square metre in England and Wales to help you find out what extra floor space could be worth in your area.
The value of an extension will depend on many things that we haven’t allowed for here, like the quality of construction, what type of room it is, and the exact location of the property within your local authority. This calculator uses average values for houses across local authority areas.
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<iframe width="100%" height="1200px" src="https://www.ons.gov.uk/visualisations/dvc434/calculator/index.html" scrolling="no" frameborder="0"/>
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