Before-you-buy checks
Three checks. In the right order.
Screen planning first, test the fit, then calculate the finished base size.
Decision tool
Summerhouse base calculator: record the finished footprint
Add an edge allowance to the maker's base footprint and keep one clear finished dimension for the groundwork.
Open tool →Decision toolSummerhouse planning checker: screen the main limits
Answer the main England outbuilding questions and get a plain-English note explaining what to check with your council.
Open tool →Decision toolSummerhouse size checker: will it fit your garden?
Turn the usable garden patch, maintenance gap and door clearance into a practical maximum shopping envelope.
Open tool →