Detail this asset from Unity Asset Store: Original Link
This is a paid asset, but now you can download Room Architect Free.
Room Architect v1.2.1
Have you ever struggled to populate your game environnement with fully functional architectures? Did you ever get frustrated by how static house models can be, requiring a lot of work from your model designer to get a diverse looking game?
If so, this asset is made to resolve your concerns
Room Architect is a code based, procedural and architectural generator. Loaded with design tools and methods, it enables your team to create a house model that could be never twice the same if you chose to do so. Create your template, randomize textures, rooms, roof types, nest models together, take full control of your buildings !
possibilities are endless: houses, buildings, dungeons, facilities, mazes, it is your call
Models can be generated in the editor and saved as prefabs, or generated and randomized at run-time. Generations of medium size regular houses are quasi instantaneous !
The generated can be customized to be used in a variety of contexts: 3/4 view, first person, top down, and you can select different levels of optimization to suit a computer game, or make it mobile friendly!