ADA Handrail Requirements for Commercial Stairs and Ramps

A commercial stair usually carries two rails at two heights, and they come from two different rulebooks. ADA covers the handrail you grip: 34 to 38 inches high, a shape your hand closes around, and extensions past the top and bottom step. The building code covers the guard at the open edge: at least 42 inches, with openings a 4-inch sphere cannot pass.

ADA vs the building code

ADA is a federal accessibility standard, and it governs the handrail on an accessible route: the stairs and ramps people use to get into and through a building. The building code, the IBC, adopted in California as the California Building Code, governs the guard, the barrier at an open edge more than 30 inches up.

A 42-inch guard sits too high to grip mid-stride, which is why the code wants the lower handrail alongside it. That is how a typical commercial exterior stair ends up with both. The federal handrail and ramp rules are on the U.S. Access Board’s ADA Standards page.

Handrail height: 34 to 38 inches

The graspable handrail sits 34 to 38 inches above the stair nosings, the ramp surface, or the walking surface, measured to the top of the rail. That range is the same under ADA and the building code, so there is one number to hit. The rail runs continuously along the flight, and on an accessible route it goes on both sides. Continuous means it does not stop and restart at a post in the middle of the run.

The grip: a measured spec

A round pipe between 1-1/4 and 2 inches across passes, because a hand closes all the way around it. Schedule 40 steel pipe lands in that range. A wide flat top rail or a big square section fails, because a hand cannot wrap it. The gripping surface also has to be continuous, with nothing in the way of a hand sliding along it.

Extensions past the steps

The handrail cannot stop at the last step, and the extensions are what get left off drawings. On a ramp the rail runs 12 inches past the top and the bottom. On a stair it extends 12 inches horizontally past the top riser, and at the bottom it continues for one tread depth past the last riser before it turns. Without them the rail does not meet the standard, even at the correct height.

The guard is a different rail

A guard is the barrier at an open edge: a stair side, a landing, a raised walkway, a mezzanine. In a commercial building it is at least 42 inches tall, and the openings have to be tight enough that a 4-inch sphere cannot pass through, so a small child cannot slip between the pickets. Inside those two limits the infill is open: vertical pickets, a welded steel mesh panel, or ornamental iron work.

Ramps

A ramp needs handrails on both sides once it rises more than 6 inches. Same 34 to 38 inch height, same graspable shape, same extensions. Ramps carry their own slope and landing rules on top of that, but the handrail spec matches the stairs. Galvanized steel pipe is the common pick outdoors, because it is graspable at the right diameter and there is no paint to keep up.

What we build it from

We build handrails, guards, and ADA ramp rails in steel and iron, welded: Schedule 40 pipe for the graspable handrails, tube and pickets for the guards. The posts get base-plated or core-drilled into the concrete depending on what is under them. Galvanized where it is exposed to weather, powder coat where it has to match a building. A railing runs $80 to $120 a foot installed, with primer-only pipe at the bottom of that and a powder-coated guard with mesh infill at the top.