The average thickness of an American house floor is about one inch. This would include the subfloor and any time of other floor covering.
Hopefully he has a house that has one floor. If he has two he wouldnt be able to use the second floor or he would fall through it. And now for the answer. His house is on Earth. COMMON SENSE
Your house can have a 'floor one' and a dungeon. If you consider the dungeon to be another floor, then yes. If not, then no.
One software one can use to make a house plan would be Floor Planner.
You can have a 'floor one' and a dungeon. If you consider the dungeon to be another floor, then yes. If not, then no.
A bungalow
For instance a tall light house building has only one floor while Empire State Building (a multi storey building) has 102 floors.
There is a loose wire connection in one of the circuits. Get the circuit repaired before you have a fire.
A 'storey' is a floor of a building, so a single storey is a one-floor house or building.
Heat moves upward, so you could theoretically just heat the lower floor. In the summer, you would cool the upstairs and the downstairs would remain cooler. However, variables such as how extreme the heat and cold are in your house, and your house's quality of insulation, windows and roofing probably will affect your plans.
The kitten wont be able to climb the stairs so you have to have a litterbox on whatever floor it is on. For an adult cat you still only need one litter box on one floor
First buy a igloo which has one ordinary floor and one not. Then buy a floor from the catalog