Extensions

Single storey vs double storey extension — costs, planning, build time and which adds more value. UK guide for 2026.

Wondering how long a house extension takes? Here’s a realistic UK timeline covering design, planning permission, building regs, finding a builder, and the build itself.

Do I need planning permission for an extension? Find out when you need it, when you don’t, and what Permitted Development allows in the UK.

How much does a house extension cost in 2026? Real UK prices for single storey, double storey, kitchen and wrap-around extensions — plus the hidden costs most people forget.