LogInThis Geometry Nodes-powered add-on will allow you to create a finished building in minutes.
3D Artist Isak Waltin released Procedural Building Generator 1.1, a new add-on for Blender that will allow you to turn models and meshes into beautiful buildings in minutes. While this generator is active, it is possible to model a simple house shape, and the add-on will interactively generate a building from the settings you choose. What's more, this generator works on low poly meshes, meaning that you can take any pre-existing mesh and turn it into a building as well.
The plug-in includes five asset packs (makeshift building style, wooden style, half-timbered style, Swedish cottage style, and pueblo architecture style) that will allow you to pick an architectural style for your buildings and customize them to your heart's content by making the walls more random, toggling support beams in the corners, selecting the paint color for different elements, and more.
Here's an explanation video shared by the artist that will help you to get started with the add-on:
You can learn more and purchase the add-on for $7 here.