# stairtower-bottom-step-maximum-height — Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)

For stairtower-bottom-step-maximum-height, paragraph citation is 1926.451(e)(4); type of requirement is maximum height; value (imperial) is 24 inches; value (metric) is 61 cm; applies to is Stairtowers (scaffold stairway/towers), recorded from its source on 2026-08-31; source re-checked 2026-09-14.

- **Requirement ID:** stairtower-bottom-step-maximum-height _(our reading, not quoted from the source)_
- **Paragraph citation:** 1926.451(e)(4) _(our reading, not quoted from the source)_
- **Type of requirement:** maximum height _(our reading, not quoted from the source)_
- **Value (imperial):** 24 inches _(verified: appears in the quote below)_
- **Value (metric):** 61 cm. _(verified: appears in the quote below)_
- **Applies to:** Stairtowers (scaffold stairway/towers) _(verified: appears in the quote below)_
- **Regulation section heading:** Access _(verified: appears in its own passage below)_

## What the source says

> (4) Stairtowers (scaffold stairway/towers) shall be positioned such that their bottom step is not more than 24 inches (61 cm.) above the scaffold supporting level.

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Regulation section heading

> (e) Access.

## Source

- https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-L/section-1926.451

Last verified: 2026-09-14. Review by: 2027-08-31.
Part of [Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)](https://referencesource.org/osha-scaffold-dimensional-tolerances/).