The Nice2 stair kit is an adjustable space-saving set of steps with an alternating tread design for maximum space utilization. A good upgrade to a loft ladder. I'd carpet them for the kitty cat. | Tiny Homes
The Kompact or a Komoda stair kits for space saving (NORMAL step) stair options. They come in internal or external steel spiral staircases in addition to timber variations. Supplier of kit timber staircases that can be used as main staircase options.