Extension Cost Calculator

Simply select the type of renovation you are doing, rooms you are renovating, and input your postcode, then press 'Update'. Then by using the 'Customisation options', you can select your overall finish quality and input the size of your renovation.

Select type of renovation
  • Ground floor extension
  • First floor extension
  • Two storey extension
  • Loft conversion
  • Basement conversion
  • Garage conversion
  • Internal
Select rooms
  • Kitchen
  • Utility room
  • Bathroom
  • En-suite

Customisation options

Your cost breakdown

Customisation options

Overall finish quality

Low-end
Low-end
Mid-end
High-end
2040
2520
3000

Your cost breakdown

15
Professional fees*
(15%)
Labour and build cost
40
80
110
Windows and doors
20
40
60
Heating
50
110
160
Decor and finishing
10
Contingency*
(10%)

Total cost estimate (inc VAT)

£0

This is a high level estimate and should be used as a guide only
Our extension cost calculator has been designed alongside industry experts to give you a rough guide for the cost of your extension or cost of your loft conversion. Sign up for free to see the breakdown of your extension cost calculator estimate on our Budget Tool.

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