Free tools
Plan with better numbers.
Sketch an extension, estimate its area and cost, then explore build cost, project timing, planning complexity and potential value. No email gate.
These prototype calculators are early budgeting and decision-support tools only. They are not a quotation, planning opinion, valuation or programme commitment.
Indicative build range
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Prototype rates only. Excludes professional fees and abnormal works.
Indicative pre-build programme
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Starter result
Answer the questions
Illustrative uplift
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Not a valuation or guarantee.