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Headroom

Is there enough headroom over the stairs?

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

The short answer

The current baseline flags headroom below 80 inches.

StairSolver uses this as a baseline planning check. If the measurement crosses the threshold, the report explains what number triggered the flag and what to ask before building, buying, or approving a plan.

Report boundary

Baseline risk, not local approval.The local authority, inspector, engineer, or qualified stair professional still decides the final answer for the exact property.

Referenced article content

What the cited source says

This is a StairSolver summary of the cited source content, written in plain language so you can understand the rule before opening the official reference.

  • The cited IRC baseline treats stair headroom as a minimum vertical-clearance check along the stair path.
  • StairSolver uses the entered lowest overhead height to flag a baseline risk when the reported clearance is below 80 inches.
  • The source explains the headroom concern, but the actual ceiling, beam, opening edge, and finished surfaces must be checked on site.

What StairSolver checks

Inputs used for this warning

  • lowest ceiling height above the stair
  • opening length
  • selected stair layout

User input fields: lowest ceiling height above stair, ceiling or floor opening length.

Why it matters

What problem this prevents

  • A stair can look acceptable in plan view while still failing because the user hits a low beam, ceiling, or floor opening.
  • This is why the report asks where the lowest point is, not just what the average ceiling height is.

What to ask before building

Questions generated from this risk

  1. Where is the tightest headroom point, and how will it be verified before framing?
  2. Can the plan mark the lowest overhead point on the drawing?

What this page cannot prove

Where the tool stops

  • It cannot say your local inspector will approve the stair.
  • It cannot measure hidden framing or finished ceiling build-up from a typed number alone.

Official source links

Check the original source if you need the authority trail

These links leave StairSolver. Use them when you want to verify the official citation, then come back to the calculator to test your dimensions.

2021 IRC R311.7.2

Baseline residential stair check for minimum stairway headroom.

International Code Council / irc-baseline-2026-07-01Open 2021 IRC R311.7.2