How long does a double storey extension take in Windsor?

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A double storey extension in Windsor usually takes 16 to 26 weeks on site once drawings, approvals, materials, and start date are ready. Planning and pre-build checks can add several weeks before work begins. 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. 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. Windsor has more period homes, narrow streets, older drainage, and central conservation constraints than many Berkshire towns. Parking, skips, delivery timing, and neighbour boundaries can be bigger cost variables than the basic floor area. Windsor sits under Royal Borough of Windsor & Maidenhead. Projects near central Windsor, Eton, and older terraces often need careful checks on roof form, frontage changes, overlooking, and heritage setting. The quote should include foundations sized for two floors, steels, floor structure, roof alterations, stairs or landing changes, and upstairs making good. For Windsor work, a credible builder should talk clearly about temporary works, dust control, access, and how Building Control inspections will be staged. The on-site timeline is only one part of the programme; drawings, permissions, materials, and lead times can be just as important. A realistic programme includes site setup, messy stages, inspection points, weather-sensitive work, supply lead times, and final snagging. 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 Windsor 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.