Braillito Maps · Accessibility guides
ADA handrail requirements: height, diameter, clearance and extensions
A handrail is what many people hold on to so they can climb a ramp or a flight of stairs without falling. The 2010 ADA Standards set almost every part of it: which ramps and stairs need one, how high it goes, how thick it is, how far it stands from the wall and how far it continues past the slope. These are the requirements of section 505, each with its section of the standard (2010 ADA Standards, 505).
This is a summary. The official 2010 ADA Standards for Accessible Design are the reference.
When the ADA requires handrails
Section 505 says how a handrail is built. Whether a ramp or a stair needs one comes from other sections of the standard, which send you to 505 (2010 ADA Standards, 505.1):
- Ramps: every ramp run on an accessible route that rises more than 6 inches (150 mm) has handrails (2010 ADA Standards, 405.1 and 405.8). Any walking surface steeper than 1:20 is a ramp (2010 ADA Standards, definition of “ramp”); how steep it may be is in the ADA ramp slope guide.
- Stairs: interior and exterior stairs that are part of a means of egress follow section 504, and 504 requires handrails that comply with 505 (2010 ADA Standards, 210.1 and 504.6); the risers, treads and nosings of 504 are in ADA stair requirements. For other stairs, the standard notes that state or local building codes may still require handrails or guards (2010 ADA Standards, advisory 210.1).
- Both sides: stairs and ramps have a handrail on each side. The one exception is aisle ramps in assembly areas, where a handrail at either side or within the aisle width is enough (2010 ADA Standards, 505.2).
- Flat or gentle walks: handrails are not required on walking surfaces no steeper than 1:20, but where someone installs them, they still have to comply with 505 (2010 ADA Standards, 403.6). The rules on both sides, continuity and extensions do not apply to them, because those only concern ramps and stairs (2010 ADA Standards, advisory 505.1).
Some exceptions cover particular places, among them: In employee work areas, a common-use ramp may be built without handrails if it is designed so that compliant ones can be added later (2010 ADA Standards, 405.8). Aisle stairs in assembly areas, stairs that connect play components and, in detention and correctional facilities, stairs outside public use areas do not have to comply with 504 (2010 ADA Standards, 210.1, exceptions 1, 3 and 4). And in an existing building, stairs between levels already connected by an accessible route do not have to meet the rest of 504, but they do get handrails that comply with 505 when the stairs are altered (2010 ADA Standards, 210.1, exception 2).
ADA handrail height: 34 to 38 inches
The top of the gripping surface is at least 34 inches (865 mm) and at most 38 inches (965 mm) above the surface, measured vertically. On a ramp it is measured from the ramp surface; on stairs, from the stair nosings, the front edges of the steps (2010 ADA Standards, 505.4).
The height also has to be consistent along the whole rail, so a hand sliding up a ramp or a flight of stairs does not have to climb or drop to stay on it (2010 ADA Standards, 505.4).
Those figures are for adults. Where children are the main users, as in an elementary school, the standard recommends a second, lower handrail no higher than 28 inches (710 mm), with at least 9 inches (230 mm) between the two rails to help prevent a child from getting caught between them. It is a recommendation, made in an advisory note, not a requirement (2010 ADA Standards, advisory 505.4).
On ramps that connect play components in a playground, the requirement itself is lower: 20 to 28 inches (510–710 mm) to the top of the gripping surface (2010 ADA Standards, 1008.2.5.3.2). More in the guide to accessible playgrounds.
Diameter, shape and clearance from the wall
A handrail has to be something a hand can close around and slide along without letting go. These are the measurements that make it so:
| Element | Requirement | Section |
|---|---|---|
| Round handrail | outside diameter of 1 1/4 to 2 inches (32–51 mm) | 2010 ADA Standards, 505.7.1 |
| Other shapes | perimeter of 4 to 6 1/4 inches (100–160 mm), and no cross-section dimension larger than 2 1/4 inches (57 mm) | 2010 ADA Standards, 505.7.2 |
| Clearance from the wall | at least 1 1/2 inches (38 mm) between the gripping surface and the wall or any other surface next to it | 2010 ADA Standards, 505.5 |
| Top and sides | continuous along its length, with nothing in the way | 2010 ADA Standards, 505.6 |
| Underside | obstructed for no more than 20 % of its length; anything that sticks out horizontally below it is at least 1 1/2 inches (38 mm) lower | 2010 ADA Standards, 505.6 |
| Finish | no sharp or abrasive elements on the rail or the surfaces next to it, and rounded edges | 2010 ADA Standards, 505.8 |
| Fittings | the handrail does not rotate within its fittings | 2010 ADA Standards, 505.9 |
| Projection into the path | up to 4 1/2 inches (115 mm) into a circulation path, where other objects between 27 and 80 inches (685–2030 mm) high may project 4 inches (100 mm) | 2010 ADA Standards, 307.2 |
A thicker rail may sit a little closer to what projects below it: the 1 1/2-inch gap may shrink by 1/8 inch (3.2 mm) for each 1/2 inch (13 mm) of perimeter over 4 inches (100 mm) (2010 ADA Standards, 505.6, exception 2). The standard explains why the grip has to stay clear: older people, people with disabilities and others benefit from a continuous surface they can reach for with their fingers, above all when they feel they are losing their balance or starting to fall (2010 ADA Standards, advisory 505.6).
A handrail is not a grab bar. The grab bars in an accessible restroom share the round diameter of 1 1/4 to 2 inches, but they sit lower, 33 to 36 inches (840–915 mm) above the floor, and exactly 1 1/2 inches (38 mm) from the wall rather than at least that (2010 ADA Standards, 609.2.1, 609.3 and 609.4).
Handrail extensions at ramps and stairs
A handrail keeps going a little past the slope, so the hand is still supported before the first step and after the last one. The extensions run in the same direction as the stair flight or the ramp run (2010 ADA Standards, 505.10):
| Where | Extension | Section |
|---|---|---|
| Ramp, top and bottom | horizontal, above the landing, at least 12 inches (305 mm) beyond the end of the ramp run | 2010 ADA Standards, 505.10.1 |
| Stairs, top | horizontal, above the landing, at least 12 inches (305 mm), starting directly above the first riser nosing | 2010 ADA Standards, 505.10.2 |
| Stairs, bottom | continues at the slope of the stairs for a horizontal distance of at least one tread depth beyond the last riser nosing | 2010 ADA Standards, 505.10.3 |
Treads on ADA stairs are at least 11 inches (280 mm) deep, so on a compliant stair the bottom extension covers at least 11 inches horizontally (2010 ADA Standards, 504.2 and 505.10.3). Every extension ends by returning to a wall, a guard or the landing surface, or carries on into the handrail of the next ramp run or stair flight (2010 ADA Standards, 505.10.1 to 505.10.3).
Along the way, the handrail is continuous for the full length of each flight or run. On switchback or dogleg stairs and ramps, which turn back at a landing, the inside handrail also continues from one flight or run to the next (2010 ADA Standards, 505.3), and needs no extension at that turn (2010 ADA Standards, 505.10, exception 1).
Extensions are not required either for ramp handrails in assembly area aisles, where the rails break to give access to the seats, or in alterations, where a full extension would be hazardous because of the layout (2010 ADA Standards, 505.10, exceptions 2 and 3).
Ramp handrails and stair handrails, side by side
| Requirement | Ramps | Stairs |
|---|---|---|
| When they are required | runs that rise more than 6 inches (150 mm) (2010 ADA Standards, 405.8) | stairs that are part of a means of egress (2010 ADA Standards, 210.1) |
| Sides | both (2010 ADA Standards, 505.2) | both (2010 ADA Standards, 505.2) |
| Height | 34 to 38 inches (865–965 mm) above the ramp surface (2010 ADA Standards, 505.4) | 34 to 38 inches (865–965 mm) above the stair nosings (2010 ADA Standards, 505.4) |
| Top extension | 12 inches (305 mm), horizontal (2010 ADA Standards, 505.10.1) | 12 inches (305 mm), horizontal, from the first riser nosing (2010 ADA Standards, 505.10.2) |
| Bottom extension | 12 inches (305 mm), horizontal (2010 ADA Standards, 505.10.1) | one tread depth, at the slope of the stairs (2010 ADA Standards, 505.10.3) |
| Width between the rails | 36 inches (915 mm) clear, at least (2010 ADA Standards, 405.5) | not set in section 504 (2010 ADA Standards, 504) |
Ramps also need edge protection on each side of runs and landings: either the surface extends at least 12 inches (305 mm) beyond the inside face of the handrail, or a curb or barrier keeps a 4-inch (100 mm) sphere from slipping through near the surface (2010 ADA Standards, 405.9), with exceptions for ramps that do not need handrails and have flared sides no steeper than 1:10, and for some landing sides (2010 ADA Standards, 405.9, exceptions 1 to 3, and 406.3). To size the ramp itself, the ADA ramp calculator works out the length and the landings for a given rise.
How to check a handrail on site
With a tape measure and a couple of minutes, anyone can check the main points. It does not replace an inspection, but it tells you what a ramp or a flight of stairs will be like to use:
- Count the rails. A ramp or a stair that needs handrails has one on each side (2010 ADA Standards, 505.2).
- Measure the height from the ramp surface, or from the front edge of a step, to the top of the rail: 34 to 38 inches, at several points along the way (2010 ADA Standards, 505.4).
- Close your hand around it. A round rail measures 1 1/4 to 2 inches across; a flat board or a decorative profile has to stay within 4 to 6 1/4 inches of perimeter (2010 ADA Standards, 505.7).
- Slide your hand along it. Nothing should get in the way on top or at the sides, and there should be at least 1 1/2 inches between the rail and the wall (2010 ADA Standards, 505.5 and 505.6).
- Look at the ends. On a ramp, the rail continues 12 inches flat at the top and at the bottom; on stairs, 12 inches flat at the top and one more tread, sloping, at the bottom (2010 ADA Standards, 505.10).
- Give it a twist. It should not rotate in its fittings, and nothing on it should be sharp (2010 ADA Standards, 505.8 and 505.9).
Handrails in Braillito Maps
Braillito Maps is a community map where each place answers ten questions: step-free entrance or ramp, wide doorway, accessible restroom, accessible parking, tactile paving, braille signage, braille menu, audible signals, guide dogs welcome and a quiet environment. Each answer is yes, no or no data, and the place gets a score out of ten.
Handrails are not a question of their own. The one they belong with is the first, step-free entrance or ramp: whether you can get in without steps, by a ramp or at street level. The app asks you to mark only what you saw and to leave the rest unmarked, so a ramp nobody has checked stays as no data instead of a guess.
What this guide adds is what to look at when you get there. A ramp that rises more than 6 inches with no handrails, or with a rail on one side only, is not what sections 405.8 and 505.2 describe (2010 ADA Standards, 405.8 and 505.2), and for someone using a cane, a walker or crutches, that rail can decide whether they go in at all.
Frequently asked questions
What is the ADA handrail height?
34 to 38 inches (865–965 mm), measured vertically to the top of the gripping surface from the ramp surface or the stair nosings, and at a consistent height (2010 ADA Standards, 505.4).
Does the ADA require handrails on both sides of stairs and ramps?
Yes. Stairs and ramps have handrails on both sides; the exception is aisle ramps in assembly areas, where one handrail at either side or within the aisle is enough (2010 ADA Standards, 505.2).
How far does an ADA handrail extend past the stairs?
At the top, at least 12 inches (305 mm) horizontally, starting above the first riser nosing; at the bottom, at the slope of the stairs for at least one tread depth beyond the last riser nosing (2010 ADA Standards, 505.10.2 and 505.10.3).
What diameter is an ADA handrail?
A round handrail is 1 1/4 to 2 inches (32–51 mm) across. Other shapes need a perimeter of 4 to 6 1/4 inches (100–160 mm) and no cross-section dimension over 2 1/4 inches (57 mm) (2010 ADA Standards, 505.7).
How far from the wall does an ADA handrail have to be?
At least 1 1/2 inches (38 mm) between the gripping surface and the wall or any surface next to it (2010 ADA Standards, 505.5).
When does an ADA ramp need handrails?
When a ramp run rises more than 6 inches (150 mm) (2010 ADA Standards, 405.8).
More accessibility guides
- ADA ramp slope: the 1:12 rule, width, landings, handrails and edge protection.
- ADA stair requirements: riser height, tread depth, nosings, open risers, landings and which stairs the 2010 Standards cover.
- ADA bathroom requirements: toilet height and position, grab bar height, sink height, stall sizes and turning space.
- ADA compliance: a checklist for small businesses, with the 2010 Standards section behind each item.
- Accessible playgrounds: how many play components must be accessible under the ADA, the route, the ground surface and transfer platforms.
- All accessibility guides
Sources
Every figure in this guide comes from one of these official texts, which we read in October 2026.
- 2010 ADA Standards for Accessible Design. U.S. Department of Justice, published September 15, 2010; required for new work since March 15, 2012.
Braillito Maps
Find places with ramps, accessible toilets or tactile paving near you in Braillito Maps
In Braillito Maps, every place answers ten questions. One is the ramp: whether you can get in without steps, by ramp or at street level. It is built by the people who need it, and every place gets a score out of ten.
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