I need a estimation software added to my project management system. Mine is built with python and django

So I ve got project management software. Where i create projects with list of works and etc. I want to add automatic pre set templates. Lets say I choose Extension and I only need to enter wall sizes and it automatically caculates everything. like wall area, floor area, roof area, plastering area (walls+ ceilings),when i add door and window sizes it deducts it from the wall sizes. Also it let's me choose what needs doing like kitchen fitting, radiators, any electrical works and etc.