# mobile-stairway-type-ladder-minimum-step-width — Every numeric dimensional tolerance and safety factor in OSHA's scaffold general requirements (29 CFR 1926.451)

For mobile-stairway-type-ladder-minimum-step-width, paragraph citation is 1926.451(e)(3)(iii); type of requirement is minimum width; value (imperial) is 111⁄2 inches; value (metric) is 30 cm; applies to is mobile scaffold stairway-type ladders, recorded from its source on 2026-08-31; source re-checked 2026-09-14.

- **Requirement ID:** mobile-stairway-type-ladder-minimum-step-width _(our reading, not quoted from the source)_
- **Paragraph citation:** 1926.451(e)(3)(iii) _(our reading, not quoted from the source)_
- **Type of requirement:** minimum width _(our reading, not quoted from the source)_
- **Value (imperial):** 111⁄2 inches _(verified: appears in the quote below)_
- **Value (metric):** 30 cm _(verified: appears in the quote below)_
- **Applies to:** mobile scaffold stairway-type ladders _(verified: appears in the quote below)_
- **Regulation section heading:** Access _(verified: appears in its own passage below)_

## What the source says

> (3) Stairway-type ladders shall: (i) Be positioned such that their bottom step is not more than 24 inches (61 cm) above the scaffold supporting level; (ii) Be provided with rest platforms at 12 foot (3.7 m) maximum vertical intervals; (iii) Have a minimum step width of 16 inches (41 cm), except that mobile scaffold stairway-type ladders shall have a minimum step width of 111⁄2 inches (30 cm); and

## 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/).