The only way to safely use a ladder on stairs is to invest in an adjustable ladder, such as a Little Giant Ladder. Adjustable ladders allow you to adjust the A-frame on one side of the ladder, which then can be used on stairs. Using an adjustable ladder will make projects that are impossible with a standard ladder, such as painting a stairway...
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
A- Frame Above Ground Pool Adjustable Ladder Confer Plastics 7000
Need a place to hang blankets, towels, clothes or accessories? Our Trenton Ladder is the perfect solution! Made from walnut stained ashwood and steel, this adjustable ladder helps you clear the clutter and add an interesting vertical design element to your home.