Ladders: simple equipment, second-most-cited standard
Federal OSHA issued 2,758 ladder citations in construction in FY2025 — behind only fall protection. The rules are short and specific, which is exactly why they get cited: a ladder set at the wrong angle, one that stops at the landing instead of extending past it, or a stepladder used as a leaning ladder is a violation an inspector can see from across the site.
The 4:1 rule, and the geometry it produces
29 CFR 1926.1053(b)(5)(i) requires a non-self-supporting ladder to be set so the horizontal distance from the top support to the foot is approximately one-quarter of the working length. The working length is measured along the rail, not up the wall, so the numbers are related: a ladder supported 16 ft up needs its foot roughly 4.1 ft out, giving a working length of about 16.5 ft and a set-up angle near 75.5°. Steeper risks tipping backward; shallower risks the foot sliding out.
Three feet above the landing
When the ladder is how you get onto an upper level, 1926.1053(b)(1) requires the side rails to extend at least 3 ft above the landing surface — the handhold you use to step off and back on. Where that extension is not possible, the ladder must be secured at the top and a grasping device provided. Because the rails sit at an angle, 3 ft of vertical extension needs slightly more than 3 ft of rail, so the shortest ladder that legally reaches a landing is always longer than the height itself.
Four times the load — including what you carry
Portable ladders must sustain at least 4 times the maximum intended load, with extra-heavy-duty type 1A metal or plastic ladders at 3.3 times (1926.1053(a)(1)). The intended load is the worker plus tools and material — the reason a 200-pound worker carrying a 60-pound load is not a 200-pound problem. Duty ratings (Type IAA, IA, I, II, III) come from the ANSI A14 classification rather than from OSHA; match the rating to the load you actually carry.
Frequently asked questions
What is the OSHA 4:1 ladder rule?
For a non-self-supporting ladder — one that leans against a structure — 29 CFR 1926.1053(b)(5)(i) requires the ladder to be positioned so that the horizontal distance from the top support to the foot is approximately one-quarter of the working length. A ladder resting 16 feet up therefore sits about 4 feet out from the wall, which produces a set-up angle of roughly 75.5 degrees from horizontal. This tool does that arithmetic from the height you measure.
How far must a ladder extend above a landing?
At least 3 feet. 29 CFR 1926.1053(b)(1) requires the side rails of a ladder used to access an upper landing surface to extend at least 3 feet above that landing; where that is not possible, the ladder must be secured at its top and a grasping device provided to help with mounting and dismounting. Because the rails run at an angle, reaching 3 feet of vertical extension takes slightly more than 3 feet of rail — the tool computes both.
How much weight must a ladder hold?
At least 4 times the maximum intended load for portable ladders, except that extra-heavy-duty type 1A metal or plastic ladders must sustain at least 3.3 times (29 CFR 1926.1053(a)(1)). Fixed ladders must support at least two 250-pound loads concentrated between any two consecutive attachments, plus anticipated loads. The maximum intended load is the worker plus tools and material — not just body weight.
Can you stand on the top step of a stepladder?
No. 29 CFR 1926.1053(b)(13) states that the top or top step of a stepladder shall not be used as a step. A stepladder is also self-supporting, so it must not be leaned against a wall or used partially closed — those uses defeat the design and are common citation items.
Who inspects ladders, and how often?
29 CFR 1926.1053(b)(15) requires ladders to be inspected by a competent person for visible defects on a periodic basis and after any occurrence that could affect their safe use. A competent person is someone who can identify the hazards and has authorization to take prompt corrective action (29 CFR 1926.32(f)). Any defective ladder is tagged and removed from service until repaired.
Sources & verification
Ladder requirements verified against osha.gov on 2026-10-05; citation counts are OSHA’s FY2025 construction data. Duty ratings are an ANSI A14 classification, not an OSHA one. General guidance, not legal advice. State-Plan states may impose additional requirements.
Ladder safety guide →Standard 1926.1053 →Fall Clearance Calculator →Fall Protection hub →