How much does a double storey extension cost in Slough?

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A double storey extension in Slough 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 Slough homeowners, clear exclusions and a realistic programme matter because small access problems can quickly become extras. Slough projects are often value-led improvements on busy residential streets, including semis, terraces, and practical family homes. Tighter parking, skip placement, and delivery access can affect labour time and should be discussed before the quote is treated as fixed. 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. Slough sits under Slough Borough Council. Slough Borough Council checks can become more important where parking, overlooking, previous extensions, or dense street layouts are involved. 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 Slough 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.