StairSolver Source Library

A shallow tread means each step gives your foot less landing space, so the stair can feel steep and may become a baseline risk before construction starts.

A tall riser makes every step higher, which can make the stair harder to climb and can trigger baseline risk even when the stair looks simple.

Headroom is the tightest overhead clearance along the stair path, and it often becomes the hidden problem in basements, attics, and remodels.

A short ceiling or floor opening can make the stair path fail in the real room even when the rise/run math looks acceptable.

A landing is the flat space where the stair starts, ends, or turns; if it is too tight, the layout can create a planning or inspection conversation before work starts.

Finished stair width can shrink after walls, trim, and handrails are added, so a tight width should be checked before the plan is treated as buildable.

Rise and run math does not prove that handrails, guards, openings, heights, or graspable details are acceptable, so those items need their own plan review.

Permit responsibility should be written down before work starts because baseline stair checks do not replace local approval or contractor obligations.

A stair proposal should name the layout, dimensions, materials, schedule, written terms, and inspection responsibilities clearly enough to avoid avoidable disputes.

A spiral stair is a special stair type, not a simple shortcut for a normal stair that does not fit, so the exact use and local approval need confirmation.

Alternating-tread devices are limited-use access devices, so they should be treated as a local approval question rather than a general stair replacement.

A ship ladder is a special ladder-style access condition and should not be assumed to replace a normal stair without local confirmation.

State and local amendments can change the final answer, so a baseline report should always lead to a local authority check before construction.

A stair can technically fit the typed space while still feeling steep, so StairSolver flags steepness as a planning concern rather than a code approval claim.