I did something similar recently, old house, wanted floor plans for renovation / idea generation.

Initially I started with FreeCAD and used the BIM functionaly, worked well, but a few bugs at time.

I've done a few smaller scale models of some rooms recently in [Bonsai](https://bonsaibim.org/(formerly BlenderBIM), and found the process a little more pleasent. This could be due to my previous blender experience and the hotkeys being more on my bones.