It is possible to create a house with zero rooms or floors. It is also possible to have more of a specific room than there are rooms in the house. For example, you can create a house with 5 rooms, but 6,000 bathrooms.
Fixed zero rooms / floors. There cannot be more of a single type of room than there are total rooms. However, an issue remains where combined room counts can be greater than the total number of rooms in the house.
It is possible to create a house with zero rooms or floors. It is also possible to have more of a specific room than there are rooms in the house. For example, you can create a house with 5 rooms, but 6,000 bathrooms.