I do architectural modeling as a side thing. My needs in more marketing materials rather than construction documents. Would blender be a possible replacement for Sketchup given the recent announcement that SU is going subscription only?
Blender delivers great results, is a joy to use and has a vibrant community.
Also have a look at the included Archimesh add-on.
https://docs.blender.org/manual/en/latest/addons/add_mesh/ar...