If you’re using the Build It Cost Calculator then you should include both the ground floor and first floor in your calculations.
This is standard practice and what industry professionals do to caculate the Gross Internal Area (GIA); or in other words the total available floor area in your home.
If you’re using the Build It Cost Calculator then you should include both the ground floor and first floor in your calculations.
This is standard practice and what industry professionals do to caculate the Gross Internal Area (GIA); or in other words the total available floor area in your home.
You can learn more about calculating build costs here: https://www.self-build.co.uk/self-build-routes-costs/