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Extension cost calculator: Get an instant estimate

Our cost of extension calculator helps you quickly assess the feasibility of your home renovation project. Just fill out a few details and we’ll break it all down for you.

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Which bit of the house do you want to extend?

Ground Floor
Loft
First Floor
Other

How big is the area being changed in square metres?

The total of the new area being added, and existing area impacted

Select an extension type above to see size options

When are you hoping to start the design process?

Are you interested in any of these services?

A few details from you, please...