Book Companion · Chapters 8, 9 and 11
Extension cost calculator
Price a single storey, double storey or wraparound extension for your region, with design, engineer and council fees and a 15% contingency.
On iPhone, the free Estiquote app saves the estimate as a project, then adds a schedule of works, quote checks and a PDF cost plan with Project Pass. No account is needed and your projects stay on your phone.
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Estiquote figures are indicative planning ranges, not contractor quotations. They do not replace a survey, structural design or professional advice. Confirm scope, site conditions and prices with appropriately qualified professionals.