Dear Elias,
thank you for your answer. But be sure, I was searching for a tool like that. And you’re right: There are many tools who did something “procedural”. But most of them are for landscapes and foliage, or they generate buidlings, but I didn’t found any who generates WALKABLE buildings.
Right now my tool generates buildings with customizable sizes in X and Y and as many floors as you like. All floors has rooms and every one is reachable through doors, the floors are reachable by stairs.