Direct answer

A custom-engineered ladder is not limited to catalog stock lengths, and height is one of the more straightforward dimensions to customize, since a manufacturer fabricates the ladder to the exact field-verified rise rather than pulling from a fixed set of inventory lengths.

Height still is not a simple linear scale-up, though. Crossing certain thresholds changes which requirements apply, including the 24-foot mark that triggers a personal fall arrest system or ladder safety system, and the landing platform intervals that apply as a run gets taller.

A very tall run may also need to be fabricated and shipped as multiple offset sections rather than one continuous piece. A specifier should treat a non-standard height not just as a dimension to fill in on a submittal, but as a variable that can shift which fall protection system, platform spacing and section configuration the ladder needs.

Why height is a straightforward customization for a manufacturer

Because a custom-engineered ladder is fabricated to order rather than pulled from a fixed stock of standard lengths, matching an unusual field-verified height is generally simpler than matching an unusual angle or configuration.

Alaco Ladder’s custom heavy-duty ladder line illustrates how a manufacturer can extend a standard product design to a taller or higher-capacity configuration rather than treating height as a fixed catalog limit.

How the 24-foot threshold changes what’s required

A fixed ladder installed on or after November 19, 2018, that rises more than 24 feet above a lower level must be equipped with a personal fall arrest system or a ladder safety system rather than relying on a cage alone.¹ A non-standard height that happens to land just above or below this threshold can change which fall protection system the ladder needs to accommodate, so the exact field-verified rise, not a rounded estimate, should be confirmed before the fall protection system is selected.

Landing platform and offset requirements as height increases

As a ladder run gets taller, landing platform spacing becomes part of the height specification rather than an afterthought, and the required interval depends on which fall protection method is used. Where a ladder section has a cage or well, landing platforms are required at intervals of 50 feet or less, with each section offset from the adjacent section.

Where a personal fall arrest system or ladder safety system is used instead of a cage, rest platforms are required at intervals of 150 feet or less, a wider spacing than the cage-and-well interval.² Older guidance from the prior ladder standard described a related but different principle: platforms were called for at 30-foot intervals where a cage or ladder safety device was provided, or every 20 feet where none was provided.³ A non-standard height that crosses one of these intervals needs a platform built into the design, not added after fabrication.

Single continuous run versus multiple offset sections

A very tall non-standard height may not be practical to fabricate, ship or install as one continuous section, and OSHA’s own criteria for fixed ladders reflect this by requiring offset sections and landing platforms once a run exceeds the applicable interval.⁴ Splitting a tall run into offset sections also simplifies shipping and field installation compared to a single oversized piece, and gives a climber a rest point at each landing rather than a continuous unbroken climb.

What to confirm before finalizing a non-standard height

Before a manufacturer fabricates a ladder to a non-standard height, the field-verified rise should be confirmed against as-built conditions rather than the dimension shown on the contract drawings, since even a small discrepancy can shift which fall protection system or platform interval applies.

Alaco Ladder’s OSHA caged ladder page outlines how the applicable fall protection requirement is tied to the ladder’s actual height rather than a general assumption about the installation.

What to ask a manufacturer about a non-standard height

• Can the ladder be fabricated to the exact field-verified rise rather than the nearest standard length?
• Does the specified height cross the 24-foot fall protection threshold, and if so, what system does the manufacturer recommend?
• Will the ladder be fabricated as a single continuous section or multiple offset sections, and does that match the required landing platform intervals?
• Has the manufacturer confirmed the height against as-built field conditions rather than the contract drawing dimension?

Key takeaway

A non-standard ladder height is usually within a manufacturer’s fabrication capability, but the exact rise should be confirmed against field conditions before it is finalized, since crossing a code threshold such as 24 feet, or a landing platform interval, can change the required fall protection system and section configuration.

Specifying height accurately is as much a code-compliance decision as a dimensional one.

Glossary

• Field-verified rise: The actual measured vertical height a ladder must span, confirmed against as-built conditions rather than assumed from drawings.
• Landing platform: A resting platform installed at required intervals along a tall ladder run to break the climb into shorter sections.
• Offset section: A ladder section positioned out of vertical alignment with the adjacent section, connected by a landing platform.
• Ladder safety system: A device, other than a cage, that arrests a climber’s fall on a fixed ladder.
• Personal fall arrest system: An assembly of equipment used to arrest a fall from a working level, consisting of an anchorage, connectors and a body harness.

References

1. “1910.28 – Duty to have fall protection and falling object protection.” Occupational Safety and Health Administration. Accessed August 6, 2026. https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.28/.
2. “Ladder safety requirements for towers more than 20 feet in length.” Occupational Safety and Health Administration, Standard Interpretations. October 5, 2004. Accessed August 6, 2026. https://www.osha.gov/laws-regs/standardinterpretations/2004-10-05/.
3. “Landing platforms for fixed ladders.” Occupational Safety and Health Administration, Standard Interpretations. July 23, 1998. Accessed August 6, 2026. https://www.osha.gov/laws-regs/standardinterpretations/1998-07-23/.
4. “1910.23 – Ladders.” Occupational Safety and Health Administration. Accessed August 6, 2026. https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.23/.