Portable ladder rails: 3 feet above the landing

The following summary keeps each rule with its original publisher to prevent mixing standards across different regions.

• Before a technician climbs, verify the specific extension and placement requirements tied to each jurisdiction.
• Canadian placement: Set up the ladder at the required angle using the 4-to-1 Rule, which means for every 4 feet (1.2 metres) up, place the base of the ladder 1 foot (0.3 metres) from the wall or upper support it rests against, according to CCOHS.
• New Zealand placement: Place straight ladders 1m out at the base for every 4m of height for stability, according to WorkSafe New Zealand.

The rule is part of the 29 CFR § 1910.23 - Ladders. | Electronic Code of Federal Regulations (e-CFR) | US Law | LII / Legal Information Institute document.

Do not treat this 3-foot extension as a universal standard for every type of ladder or every country. A rule for one country is not a rule for every shop. Keep the claim tied to this publisher and this page. Do not move a number onto another publisher.

The check is a direct measurement of the side rails relative to the landing surface. If the side rails do not extend at least 3 feet (0.9 m) above the upper landing surface, the ladder does not meet the requirement stated in the source. This applies specifically to portable ladders used to gain access to an upper landing surface.

Other sections of this guide cover the 4-to-1 placement rule and the 1 metre in 4 metres rule, which are distinct requirements from different publishers. The US page also details inspection before initial use in each work shift and damaged ladder removal rules. The British page clarifies that ladders are not banned but are not the automatic first choice.

Rung spacing on these ladders must be not less than 10 inches (25 cm) and not more than 14 inches (36 cm) apart, measured between the centerlines of the rungs, cleats, and steps, according to Legal Information Institute. The regulation notes exceptions to this spacing requirement.

Inspection frequency is defined as before initial use in each work shift, and more frequently as necessary, to identify any visible defects that could cause employee injury, according to Legal Information Institute. This means a tech should check the ladder at the start of their shift, not just at the beginning of the week.

If a ladder has structural or other defects, it must be immediately tagged “Dangerous: Do Not Use” or with similar language and removed from service until repaired or replaced, according to Legal Information Institute. The tag must follow the language specified in § 1910.145, and the removal from service is immediate, not deferred until end of day.

Ladders are used only on stable and level surfaces unless they are secured or stabilized to prevent accidental displacement, according to Legal Information Institute. If the surface is not stable or level, the ladder must be secured or stabilized before use.

Check the landing extension, rung spacing, and surface stability before the tech climbs. Tag and remove any ladder with visible defects.

Two distinct placement rules appear on these pages, and they must not be merged into a single standard. The Canadian rule uses feet, while the New Zealand rule uses metres. Each applies to the jurisdiction and context named by its publisher.

The Canadian 4-to-1 rule

CCOHS defines the 4-to-1 Rule for setting up a ladder at the required angle. For every 4 feet (1.2 metres) of height up the ladder, the base must be placed 1 foot (0.3 metres) from the wall or upper support it rests against, according to CCOHS. This specific placement sets the ladder at a 75-degree pitch, which the source describes as the ideal angle for climber balance and ladder strength, and notes that it helps prevent the ladder from slipping, according to CCOHS.

Note that this 4-to-1 ratio is distinct from the landing extension requirement. The same Canadian source states that the ladder must be extended at least 1 m (3 ft) above the landing platform or the point of support, according to CCOHS. Do not confuse the base distance from the wall with the height above the landing.

The New Zealand 1-in-4 rule

WorkSafe New Zealand provides a different metric for straight ladders. The source instructs to place straight ladders 1m out at the base for every 4m of height for stability, according to WorkSafe New Zealand. This is a 1-metre-out-for-every-4-metres-up rule, which is numerically similar to the Canadian 4-to-1 rule but uses different units and comes from a different regulatory body.

The New Zealand source also specifies equipment standards that are not part of the Canadian placement rule. Ladders should be of industrial rating, with a minimum of 120kg, and should meet or exceed the requirements of the relevant AS/NZS 1892 Portable ladders standard, according to WorkSafe New Zealand. Additionally, the source states to stop at the third step from the top of a straight ladder, according to WorkSafe New Zealand.

WorkSafe New Zealand states to ensure the stepladder is at least 4m clear of power lines according to WorkSafe New Zealand.

Keeping the rules separate

When checking a ladder in the field, identify which jurisdiction's rule applies to the specific job site. If you are working under Canadian guidelines, use the 4-to-1 Rule in feet and the 75-degree pitch, according to CCOHS. If you are working under New Zealand guidelines, use the 1m out for every 4m up rule and ensure the ladder meets the 120kg industrial rating, according to WorkSafe New Zealand.

Do not apply the New Zealand 120kg rating to a US or Canadian ladder rule, as that specification is unique to the New Zealand source. Similarly, do not apply the Canadian 75-degree pitch to a New Zealand ladder setup unless the local source explicitly states that angle. Each rule stands on its own.

The table below lists the specific ladder checks stated by each publisher. Each row keeps the rule tied to its source.

Keep each number on its own row.

The Health and Safety Executive clarifies that ladders and stepladders are not banned under health and safety law, according to Health and Safety Executive. This distinction matters for small shops because it removes the misconception that a portable ladder is automatically prohibited on a job site. However, the absence of a ban does not mean the ladder is the default tool for every task. The same page states that the law calls for a sensible, proportionate approach to managing risk, and ladders can be a sensible and practical option for low-risk, short-duration tasks, although they should not automatically be your first choice, according to Health and Safety Executive.

This guidance suggests that a dispatcher or team lead should evaluate the specific task before handing a ladder to a technician. If the work is low-risk and will be completed quickly, a ladder may be the right choice.

The HSE also notes that there are simple, sensible precautions you should take to stay safe when using portable leaning ladders and stepladders in the workplace, according to Health and Safety Executive. This reinforces that while the tool is legal, it requires active management. For a small HVAC or plumbing shop, this means the ladder is not a "set and forget" piece of equipment. It is a tool that requires the same level of attention as a power tool or a pressure gauge.

When you review a job ticket, ask whether the task fits the "low-risk, short-duration" description. If it does, the ladder is a sensible option. If it does not, consider if a different method is needed. This is a qualitative check, not a numerical one. It requires the dispatcher or team lead to make a judgment call based on the specific conditions of the job.

A straight ladder reaches a landing 12 feet up. Using the 4-to-1 layout, every 4 feet of height places the base 1 foot out, so the base sits 3 feet from the wall. The same layout is the one tied to a 75 degree pitch. A separate check looks for side rails that run 3 feet past the landing. These figures are illustrative round numbers for the arithmetic only.

Measure the landing extension and the base placement for this job, then inspect the ladder before its first use in the shift. Write the result on the Field Service Work Order Checklist for Dispatch Handoffs. Also see Set a job priority before dispatch: 3 fields.

How far should the side rails reach above the landing?

Portable ladders used to gain access to an upper landing surface must have side rails that extend at least 3 feet (0.9 m) above that surface. This specific measurement applies to portable ladders accessing an upper landing, as stated in 29 CFR § 1910.23 on the Legal Information Institute page. You should verify this extension before a technician begins climbing to a roof or attic.

What does the 4-to-1 placement describe, and who states it?

The 4-to-1 rule describes the required angle for setting up a ladder relative to the wall or upper support. For every 4 feet (1.2 metres) of height, the base of the ladder must be placed 1 foot (0.3 metres) from the wall. This placement guidance is provided by the Canadian Centre for Occupational Health and Safety.

How often does 29 CFR § 1910.23 say to inspect a ladder?

Ladders must be inspected before initial use in each work shift. Inspections should occur more frequently as necessary to identify any visible defects that could cause employee injury. This requirement is part of 29 CFR § 1910.23 on the Legal Information Institute page.

What should happen to a ladder with a visible defect?

Any ladder with structural or other defects must be immediately tagged with the words “Dangerous: Do Not Use” or similar language. The ladder must then be removed from service until it is repaired or replaced. This tagging and removal process is mandated by 29 CFR § 1910.23 on the Legal Information Institute page.

Does a British page ban ladders?

No, ladders and stepladders are not banned under health and safety law. The Health and Safety Executive explicitly states that these tools remain legal for use. This clarification helps distinguish between regulatory bans and safety recommendations regarding ladder use.