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As a project manager specialising in residential extensions and refurbishments and based in South East England, cost is one of the biggest worries I see for both homeowners and builders. Prices rose sharply during Covid, and while the market has stabilised, costs have not returned to pre‑pandemic levels. When people ask, “How much does a house extension cost?”, the honest answer is that there isn’t a single figure. Costs vary widely depending on the size, complexity, location