David Ludwig - Architect This project was completed in 1993, so I no longer have access to the drawings, but looking at the picture. I would guess that this is a 42" wide stair with a 42" wide space between the lower and upper runs, so I would say that the hallway/entry at the base of the stair is 84" or 7' wide and probably 15' long The front door is opposite the 3 openings you can see in the wall to the right of the large opening showing the fireplace. This is the only example I have ever done withe the trine-forked wrought iron balluster, side-mounted to the stepped stringer and landing fascia, with no newell posts. This was a real challenge for the metal workers.