How much does a double storey extension cost in Maidenhead?

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A double storey extension in Maidenhead usually costs between £65,000 and £150,000. The final price depends on size, structure, access, drainage, roof design, specification, and how much work is needed to the existing house. Double storey extensions add space upstairs and downstairs, so the structure, roof tie-in, drainage, and neighbour impact need more careful coordination. Planning risk is higher because height, overlooking, loss of light, and roof massing matter more than on most single storey work. The quote should include foundations sized for two floors, steels, floor structure, roof alterations, stairs or landing changes, and upstairs making good. For Maidenhead homeowners, the quote should separate structural shell, glazing, kitchen/finish allowance, and any drainage or flood-related checks. Maidenhead work often centres on family homes, open-plan layouts, riverside pockets, and higher expectations for finish quality. Many plots have decent access, but drainage, glazing size, and high-specification interiors can move the budget quickly. Cost should be read as a range until the house has been inspected and the scope is written down. A dependable price needs assumptions on structure, foundations, access, drainage, finish level, Building Control, and what is excluded. Maidenhead sits under Royal Borough of Windsor & Maidenhead. The Royal Borough of Windsor & Maidenhead can require careful handling where previous extensions, flood considerations, or conservation edges apply. Planning permission and Building Regulations are separate. Even if planning is simple, Building Control still needs the relevant structure, insulation, drainage, fire safety, ventilation, electrics, roof work, and final completion evidence for the specific double storey extension. Before agreeing the work, ask for a written scope that names inclusions, exclusions, payment stages, variation process, site protection, waste removal, and who manages the job day to day. That is the difference between a headline price and a buildable quote. Berkshire Bespoke Builders covers Maidenhead and provides free written quotes for double storey extensions. Pindi Sahota has 32 years on the tools and manages projects personally, with fixed-price quotes once the scope is clear.