Home Extensions in Aylesbury

Types of extension

Common projects include single storey rear extensions to enlarge a kitchen or living space, side return extensions that fill in the gap beside a property, and wrap-arounds that combine the two. Double storey extensions add space upstairs as well, and garage conversions turn an existing garage into a room. Builders here take on the groundwork, structure, weathertight shell and often the internal fit-out, working to a design you provide or one they produce.

Planning permission and building regulations

Some extensions fall under permitted development, with limits on depth, height and how much of the plot is covered, while larger projects need planning permission. Either way, building regulations approval is required for the structure, foundations, insulation and drainage, and a building control inspector signs the work off in stages. Where the work is near or on a shared boundary, the Party Wall Act usually means serving notice on neighbours before you start.

Designers, builders and trades

Most extensions involve a structural engineer for the calculations and steel beams, and often an architect or technician for the drawings and any planning application. Some firms offer design and build under one roof, while others price up plans you already hold. See our architects for design, our builders for construction, our loft conversions if you are comparing going up rather than out, and our kitchen and bathroom fitters for the finishing trades.

What it typically costs

Extensions are often discussed as a cost per square metre, but the real figure depends on the size, the ground conditions, the specification of windows, doors and finishes, and whether you add a kitchen or bathroom. A double storey usually costs less per square metre than a single storey because the roof and foundations are shared across more space. Ask for a written quote that separates the build from fit-out and states who arranges building control.

Areas covered

Firms listed here serve Aylesbury and the surrounding villages and often the wider Vale and Buckinghamshire. Check each listing for its stated coverage and whether it offers design and build or works to your own plans.

Frequently asked questions