Code and standard reference
OSHA Stair Requirements
Last reviewed · BuildMath editorial team
OSHA 1910.25 requires standard stairs to use consistent riser heights and tread depths, an angle generally between 30 and 50 degrees, a maximum 9.5-inch riser, and at least 9.5 inches of tread depth. Workplace configuration, stair rail, handrail, load, and walking-working-surface rules also apply. Verify the current OSHA text before work.
Limit table
| Item | Limit or rule | Reference | Verification note |
|---|---|---|---|
| Stair angle | 30°–50° | 1910.25(c)(1) | Standard stairs outside this range need another compliant access solution. |
| Riser height | Maximum 9.5 in | 1910.25(c)(2) | Riser heights must be uniform. |
| Tread depth | Minimum 9.5 in | 1910.25(c)(3) | Tread depths must be uniform. |
| Vertical clearance | Minimum 6 ft 8 in | 1910.25(b)(2) | Measure above each tread. |
| Load | At least five times anticipated live load; minimum specified capacity | 1910.25(b)(1) | Structural verification is required. |
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Frequently asked questions
Is this the complete code text?
No. This is a focused planning summary with a direct primary-source link. Definitions, exceptions, local amendments, and adjacent sections can change how a limit applies.
Which edition should I use?
Use the edition adopted by the authority having jurisdiction for the project address, including local amendments.
Can the calculator certify compliance?
No. It can flag a value against a displayed planning limit, but approval belongs to the authority, designer, or qualified professional.
Why is the source linked?
The source link lets readers and answer engines distinguish a cited rule from an unsupported numerical claim.
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