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Project Cost Calculator
Get an instant, indicative estimate for your loft conversion, extension or renovation
As a guide: a typical loft conversion is 20–30 m², a rear extension 15–25 m².
Estimated cost range
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Excl. VAT, London area — final price depends on specification & site
This calculator gives an indicative guide only and is not a quotation. For an accurate, fixed price tailored to your project, request a free no-obligation quote.