The Building Tools addon allows you to build a house in Edit mode with a few clicks. You can add Floors (Level), Windows, Railing, Doors, Balcony and Roof. They all have several presets or you can tweak them with the operator.
For some reason the Building Tools addon for Blender 2.8 didn’t get much attention which is a bit odd it seems. The models you can make with this are suitable for stylized animations. And with some effort of course you could even use it for ArchViz. The result you get with this addon is somewhere between low- and high-poly.
It is quite simple. You can find the addon in the N-Panel after installation. And you start with “Create Floorplan”. An operator (left-bottom) will pop up and there you tweak the floorplan. Then select the floorplan, go in Edit mode. Then click “Add Floor” and choose in the operator how many floors you want.
Download can be found here: https://ranjian0.github.io/building_tools/
Or is also available on Github: https://github.com/ranjian0/building_tools
Installation is as usual.