A few years ago I used SketchUp to model some house extensions, was pretty useful to model window sunlight and shadowing through the year, and double check draf

A few years ago I used SketchUp to model some house extensions, was pretty useful to model window sunlight and shadowing through the year, and double check draft plans from the builder in terms of layout. It seems to have gone web-only now though, instead of an unpaid desktop program.