Tools
Free tools
Three tools to help you work out what's possible before you talk to anyone, plus a cost calculator for a real price range. Results are never gated behind a form.
Permitted Development Checker
Check whether a rear or side extension is likely to fall under permitted development, with the specific rule cited.
Project Matcher
Not sure what you need? Four questions to point you toward the project types most likely to fit your home.
Extension Size Visualiser
See the floor area a proposed extension would add, drawn to scale against permitted development limits.