Spiral staircase size

none are very comfortable to walk on, unless your inside diameter gets up to a couple feet. your dog may not like it at all

Sporal staircases are very pretty but if you'd like a bed up there, you will have to hoist it over the wall. They do not move easily up them nor do backboards move down them carrying a patient. Just considerations you need to be aware of.

Betsy

Any spiral stair that's less than 5' across is going to be a pain in the ass to use on a regular basis. The important dimension is actually the distance from the outside edge of the tread to wherever the tread narrows to less than 7". Because a tread less than 7" deep is more dangerous than no tread at all.

My dog loved the spiral staircase we had in a condo. He found that if he got about 1/2 way up, he could see all sorts of good things (Lhasa Apso/Shih Tzu mix -- serious watchdog). I did find that it was useful to invest in TWO vacuum cleaners - one up, one down, to avoid carrying junk up and down the spiral staircase. As to beds, furniture, etc., there was a railing that I could remove to lift the beds, furniture to the second floor. A great space saver, and looked nice. I had about