Design, approvals and the build itself: a realistic timeline for a house extension, and what can speed it up or slow it down.
Most people think about how long the builders will be on site, but the design and approval stages often take as long as the build. Planning the whole timeline helps you choose the right time to start.
Design
A measured survey, sketch options and detailed drawings usually take a few weeks, depending on how quickly decisions are made.
Approvals
- Planning permission or a Lawful Development Certificate: councils aim to decide within eight weeks
- Building regulations drawings, structural calculations and approval
- Party Wall notices, which need one to two months before work starts
The build
A typical single storey extension takes a few months on site, from groundworks to decoration. Double storey extensions, wraparounds and projects that include a new kitchen take longer. We give you a realistic programme with your quote and keep you updated as the build progresses.
