OSHA stair requirements are a common source of risk on commercial and industrial sites, especially when stairways are specified, fabricated or installed without the correct dimensional checks.
For commercial contractors, facility managers, and architects, understanding the applicable requirements before a stairway is specified or installed can help reduce the risk of costly retrofits, failed inspections and project delays.
This guide covers the requirements under OSHA 1910.25 for permanent, fixed commercial access stairs: permitted angles, dimensional specs, handrail and guardrail requirements, when non-standard stair types are allowed, and a self-audit checklist. National Ramp commercial access stairs are designed around OSHA requirements when configured for the applicable site, use case and governing standard.
Which OSHA Standard Applies to Commercial Stairs?
Two OSHA standards govern stairways in commercial settings, and which one applies depends on the phase of the project and how the stairs will be used.
OSHA 1910.25 — Walking-Working Surfaces: Stairways
The primary OSHA standard for permanent, fixed stairs in general industry.
This covers equipment access stairs, canopy access stairs, loading dock stairs, mezzanine stairs, and any other fixed stairway used as part of normal operations. If employees use the stairs as part of their daily work, 1910.25 applies.
OSHA 1926.1052 — Construction: Stairways
Applies during the construction phase of a project. Required wherever there is a break in elevation of 19 inches or more and no ramp, runway, or other means of access is provided. Once construction is complete and the building is occupied, permanent stairs must meet 1910.25.
OSHA 1910.25 vs IBC: Understanding the Difference
These two standards are frequently confused by architects and project managers. OSHA 1910.25 governs operational access stairs used by employees during normal work activities. The International Building Code (IBC) governs means-of-egress stairs — the evacuation routes that all building occupants must be able to use in an emergency.
Many commercial projects need to account for both: employee access stairs may need to meet OSHA 1910.25, while egress stairways may need to meet IBC requirements.
The two standards have different dimensional requirements and serve different purposes. Confirming which standard governs each stairway before specification is the correct starting point for any commercial stair project.
OSHA Stair Dimension Requirements (1910.25(c))
The table below covers the key dimensional requirements for permanent fixed stairs under OSHA 1910.25(c).
| Requirement | OSHA 1910.25 Specification |
|---|---|
| Stair angle | 30 to 50 degrees from horizontal |
| Maximum riser height | 9.5 inches |
| Minimum tread depth | 9.5 inches |
| Riser uniformity | No more than 3/16 inch variation between risers in one flight |
| Minimum stair width | 22 inches between vertical barriers |
| Overhead clearance | 6 ft 8 in (80 inches) minimum from tread nose to overhead obstruction |
| Minimum landing depth | 30 inches in the direction of travel |
| Tread surface | Slip-resistant, COF 0.5 minimum |
| Load capacity | 1,000 lbs minimum |
Rise/Run by Angle
The permitted 30 to 50 degree range allows different combinations of riser height and tread depth. The table below shows representative relationships across that range.
| Stair angle | Riser height | Tread run |
|---|---|---|
| 30 degrees | 6.5 inches | 11.3 inches |
| 35 degrees | 7.5 inches | 10.7 inches |
| 40 degrees | 8.5 inches | 10.1 inches |
| 45 degrees | 9.5 inches | 9.5 inches |
| 50 degrees | 9.5 inches | 8.0 inches |
Guardrail and Handrail Requirements (1910.29)
Handrails, stair rail systems and guardrail systems have different requirements under OSHA. This section outlines the key criteria that commonly apply to commercial access stairs.
Handrail specifications:
| Condition | Requirement |
|---|---|
| Stairs with 4 or more risers | Handrail required on at least one side |
| Stairs 44 inches wide or wider | Handrails required on both sides |
| Handrail height | 30 to 38 inches above the stair nosing |
| Clearance from wall | Minimum 2.25 inches |
Guardrail specifications:
| Component | Specification |
|---|---|
| Top rail height | 42 inches, plus or minus 3 inches, above walking surface |
| Mid-rail height | Midway between top rail and floor (approximately 21 inches) |
| Toeboard height | 3.5 inches minimum where required |
| Opening/baluster spacing | Maximum 19 inches |
| Top rail load capacity | Minimum 200 lbs applied in any downward or outward direction |
| When required | Any platform, stair landing, or stairway where a fall of 4 feet or more to a lower level is possible |
Non-Standard Stairs and When They Are Permitted (1910.25(b)(8))
Standard fixed stairs within the 30 to 50 degree range are required wherever they are feasible. OSHA 1910.25(b)(8) permits ship stairs, spiral stairs, and alternating tread stairs only when the employer can demonstrate that a standard stairway is not practicable due to space constraints. This determination is made on a case-by-case basis.
Ship stairs (steep-angle access stairs):
| Specification | Requirement |
|---|---|
| Permitted angle | 50 to 70 degrees from horizontal |
| Riser height | 6.5 to 12 inches |
| Tread depth | 4 inches minimum |
| Stair width | 18 inches minimum |
Ship stairs are used where space does not allow a standard stair configuration — canopy access, power generation platform access, rooftop mechanical access, and confined mezzanine installations. National Ramp designs access solutions for these applications, including custom-engineered canopy access stairs and power generation platform stairs built to 1910.25(b)(8) specifications.
OSHA Stair Compliance Checklist
Use this checklist as a starting point to review whether your commercial access stairs align with OSHA 1910.25 and 1910.29 requirements.
Stair dimensions:
- Stair slope is between 30 and 50 degrees from horizontal
- Riser height does not exceed 9.5 inches
- Tread depth is at least 9.5 inches
- Riser heights are uniform throughout the flight (variation no more than 3/16 inch)
- Stair width is at least 22 inches between vertical barriers
- Overhead clearance from tread nose is at least 6 ft 8 in (80 inches)
- Landings are at least 30 inches deep in the direction of travel
- Tread surfaces are slip-resistant
Handrails and guardrails:
- Handrail installed on at least one side for stairs with 4 or more risers
- Handrails on both sides for stairs 44 inches wide or wider
- Handrail height is between 30 and 38 inches above the stair nosing
- Top guardrail height is 42 inches (plus or minus 3 inches)
- Mid-rail is in place at approximately 21 inches
- Baluster/opening spacing does not exceed 19 inches
- Guardrails are installed wherever fall height to lower level exceeds 4 feet
- Top rail supports a minimum of 200 lbs applied outward or downward
Ongoing condition checks:
- No damaged, worn, or missing treads
- No corrosion or structural deterioration
- No obstructions on or adjacent to the stairway
- Load capacity of 1,000 lbs minimum is maintained
How National Ramp Commercial Stairs Meet OSHA 1910.25 Requirements
National Ramp commercial aluminum stairs are engineered around OSHA 1910.25 and 1910.29 requirements, with dimensions confirmed before fabrication and documentation available to support project review.
Factory fabrication helps reduce the tolerance variability that can occur with site-built stairs.
- Riser height, tread depth, stair width, and stair angle are all confirmed before fabrication and meet 1910.25(c) specifications
- Built-in guardrail systems meet 1910.29 handrail height and top rail requirements
- Modular design provides consistent, repeatable dimensions across every installation
- Available for canopy access, power generation platform access, loading dock access, and general commercial stairs
- CAD drawings and permit documentation available for all 50 states
- Factory-trained installation teams typically have systems operational within days of approval
Frequently Asked Questions
OSHA 1910.25, part of the Walking-Working Surfaces standard (29 CFR 1910 Subpart D), covers permanent fixed stairs in general industry. It applies to any stairway used by employees as part of normal operations, including equipment access stairs, mezzanine stairs, loading dock stairs, and canopy access stairs. Construction stairways during the build phase are covered by OSHA 1926.1052.
The maximum riser height under OSHA 1910.25(c) is 9.5 inches. Riser heights must also be uniform throughout a flight, with no more than 3/16 inch variation between individual risers.
The minimum tread depth is 9.5 inches under OSHA 1910.25(c). Tread surfaces must be slip-resistant, with a coefficient of friction of at least 0.5.
OSHA 1910.25 governs operational access stairs used by employees during work activities. The IBC governs means-of-egress stairs — the evacuation routes used during emergencies. Most commercial buildings need both. Employee access stairs must meet OSHA 1910.25, and egress stairways must meet IBC requirements. The standards have different dimensional specifications and serve different purposes.
Guardrails are required under OSHA 1910.29 wherever workers could fall 4 feet or more to a lower level. This includes stair landings, mezzanine edges, and loading dock platforms associated with access stair installations. The top rail must be 42 inches high (plus or minus 3 inches), with a mid-rail at approximately 21 inches.
Handrails must be between 30 and 38 inches above the stair nosing. Stairs with 4 or more risers require a handrail on at least one side. Stairs 44 inches wide or wider require handrails on both sides. The top guardrail, which is separate from the handrail, must sit at 42 inches.
Yes, provided they are engineered to OSHA 1910.25 specifications. Factory-fabricated stairs can offer an advantage over site-built stairs because key dimensions are confirmed before the system ships.
There is no fixed inspection schedule. Inspections are triggered by employee reports, referrals from other agencies, or as part of a general site inspection. Commercial stairways should be maintained against applicable requirements at all times, not only in anticipation of an inspection.
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