Stair type overview
Helical Stairs
24 in usable width, 80 in headroom. Helical stairs curve continuously without a center pole but still constrain furniture rotation.
curvedcomplex navigation
Typical Stair Measurements
Clear width
28"
Effective width
24"
Tread depth
9"
Riser height
8"
Headroom
80"
Diameter
72"
These are planning defaults. Measure your real stairway before buying, moving, or booking delivery.
Fit Notes
- No flat landing means the item must keep rotating while climbing.
- Effective width is narrower than the total diameter.
- Long items need a clean outside-radius path.
What Fits?
3-seat couch
Often works if carried upright and the landing has enough pivot space.
Queen mattress
Usually clears on edge because thickness is the limiting dimension.
Folded treadmill
Remove console parts when possible and check landing swing clearance.
Upright piano
Weight, balance, and landing turns usually require professional movers or another route.
Check Your Specific Item
Enter your item dimensions and staircase details to test the exact width, turn, landing, and headroom constraints.
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