Double Storey Extensions in Maidenhead

Local planning and Building Control

Maidenhead sits under Royal Borough of Windsor & Maidenhead for planning. Some double storey extension projects can use permitted development, but that depends on the property, previous extensions, roof shape, conservation status, and boundary position. We check the planning position at the initial visit before treating a design as straightforward.

Building Regulations are separate from planning. For double storey extensions in Maidenhead, inspections can cover structure, insulation, fire safety, drainage, ventilation, electrics, and final sign-off. The completion certificate matters when you remortgage or sell the house.

The practical details also matter. Parking, skip position, delivery access, working space, neighbour boundaries, and existing services can all affect how the job is sequenced. A good quote for Maidenhead should be based on the actual house, not a generic square-metre rate copied from another job.

Typical cost and timeline

A double storey extension in Berkshire usually costs between £65,000 and £150,000. In Maidenhead, the final figure depends on access, specification, structural steelwork, roof design, drainage, and finish level. A typical programme is 16 to 26 weeks on site once drawings, approvals, materials, and start date are agreed.

We provide a written scope before work starts so you can see what is included, what is excluded, and how any changes will be handled. That matters on domestic building work because the expensive disputes usually come from vague assumptions, not from the bricks and timber themselves.

For more detail, read double storey extension cost berkshire and what drives extension costs up. You can also compare this page with the main double storey extensions service page and our builder in Maidenhead area page.