Assuming it’s not structurally necessary, the space under the stairway is just wasted space…a perfect place for a little doggie apartment.
This is Hennessy’s room. It was built by his owner David Maceo of Tampa, Florida. He doesn’t have kids so he gets to spoil Hennessy. This room has a comfortable bed, an electric ceiling light, hardwood floors, and painted walls displaying family photos. The dining room is just off the bedroom.
If you’re not experienced in home construction, before you begin you might want to consult an expert to make sure the plan is safe and up to code. Some reinforcement may be needed.