Double Storey Extensions in Windsor

Do I need planning permission for a double storey extension in Windsor?

You may need planning permission for a double storey extension in Windsor, but some projects can use permitted development. The answer depends on size, position, previous extensions, conservation status, and whether the work changes the roof or frontage.

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.

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.

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 Windsor work, a credible builder should talk clearly about temporary works, dust control, access, and how Building Control inspections will be staged.

Planning permission and Building Regulations are separate questions, so a project can be planning-light and still need full technical sign-off. Check previous extensions, roof/frontage changes, conservation status, boundaries, height, materials, and whether permitted development rights still apply.

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.