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- What slope does an ADA ramp need?
- Width and landing dimensions
- When are handrails required?
- Surface, edge protection, and outdoor drainage
- Alterations and existing facilities use different frameworks
- Curb ramps are related but not identical
- Workplace access can involve ADA Title I
- Federal rules and local codes must be checked together
- Sources
Key Facts
- Federal level: Under the 2010 ADA Standards, a walking surface steeper than 1:20 is a ramp, and a ramp run ordinarily may be no steeper than 1:12.
- Federal level: A ramp run generally needs at least 36 inches of clear width and may rise no more than 30 inches before a level landing.
- Federal level: Landings are required at the top and bottom of each run; they generally must be at least 60 inches long, and a direction change generally requires a 60-by-60-inch landing.
- Federal level: Handrails are generally required on both sides when a ramp run rises more than 6 inches, subject to specific exceptions such as many curb ramps.
- Federal, state, and local: ADA compliance does not displace applicable building codes, permits, or accessibility rules, so a project may need to satisfy multiple standards.
The basic ADA ramp requirements are numerical, but applying them begins with context. The federal rules distinguish ramps from curb ramps, new work from existing facilities, and public access from an employee’s request for workplace access.
The 2010 ADA Standards are enforceable minimum requirements for covered new construction and alterations under Titles II and III. Title II concerns state and local government facilities; Title III covers public accommodations and commercial facilities. ADA Title I separately addresses employment and may require access to employee facilities as a reasonable accommodation.
What slope does an ADA ramp need?
A route with a running slope no steeper than 1:20 is treated as a walking surface, not a ramp. Once the slope is steeper than 1:20, the ramp provisions apply, and the maximum running slope is generally 1:12.
A 1:12 slope means one inch of vertical rise for every 12 inches of horizontal run. It is a maximum slope, not a target that prevents a gentler design. The maximum cross slope is 1:48.
Each ramp run may rise no more than 30 inches. A ramp can overcome a greater total elevation change by using multiple runs separated by compliant level landings.
Width and landing dimensions
The minimum clear width of a ramp run is 36 inches. Where handrails are provided, that clear space is measured between the leading edges of the handrails.
Level landings are required at the top and bottom of every ramp run. A landing generally must be at least as wide as the widest adjoining ramp run and at least 60 inches long in the direction of travel.
If a ramp changes direction at a landing, the landing generally must provide at least 60 inches by 60 inches of clear space. Doors at landings also need their own maneuvering clearance, and door swings generally may not reduce the required landing dimensions.
When are handrails required?
Handrails are required on both sides of a ramp run when its rise is more than 6 inches. The gripping surfaces generally must be 34 to 38 inches above the ramp surface and remain at a consistent height.
Ramp handrails generally extend horizontally at least 12 inches beyond the top and bottom of a run and must be continuous within the full length of each run. The standards include detailed rules for clearance, gripping surfaces, returns, and projections.
Curb ramps follow separate provisions and are not required to have handrails. A short ramp run with no more than 6 inches of rise is another important handrail exception.
Surface, edge protection, and outdoor drainage
Accessible walking surfaces must be stable, firm, and slip resistant. Openings, abrupt level changes, and changes in level are separately regulated.
Ramp runs and landings generally need edge protection where drop-offs exist. The standards offer compliant curb, barrier, or extended-surface approaches and contain exceptions for particular edges and conditions.
Outdoor ramps and approaches must be designed so water does not accumulate on walking surfaces. Weather exposure can also affect slip resistance and maintenance even when the original dimensions were compliant.
Alterations and existing facilities use different frameworks
New construction should not use the special steeper slopes allowed for certain alterations. In an existing site, building, or facility where space limitations prohibit a 1:12 slope, an alteration may use up to 1:10 for a maximum 6-inch rise or up to 1:8 for a maximum 3-inch rise.
Those exceptions are narrow and do not make a steep ramp acceptable merely because a gentler one costs more or is inconvenient. Altered elements generally must comply with the standards to the maximum extent feasible, subject to the applicable title and alteration rules.
An older facility is not automatically exempt because it predates the 2010 Standards. Title II applies a program-accessibility framework to existing public facilities, while Title III imposes continuing barrier-removal duties where removal is readily achievable. A limited safe harbor may protect certain unaltered elements that complied with the 1991 Standards, but it is not a universal grandfather clause.
Curb ramps are related but not identical
A curb ramp cuts through or is built up to a curb and follows provisions that differ in several details from ordinary ramps. For example, curb ramps generally do not require handrails or edge protection, and their landing and flare rules depend on the configuration and pedestrian route.
For a curb ramp, the maximum running slope is generally 1:12, although the standards provide an alternative based on the segment’s rise where existing physical constraints prevent full compliance in alterations. Designers must also account for detectable warnings where required by the facility and route context.
Workplace access can involve ADA Title I
The technical construction standards do not answer every workplace-access question. Under Title I, making existing employee facilities accessible and usable can be a form of reasonable accommodation for a qualified employee or applicant, unless the employer can establish undue hardship.
That analysis is individualized. A workplace might need a ramp, a different accessible entrance, relocation of a work area, or another effective accommodation depending on the barrier and the person’s needs. More detail appears in our overview of ADA accommodation.
Federal rules and local codes must be checked together
The ADA is federal civil-rights law, while state and local building codes govern many construction details, permits, and inspections. A local approval does not by itself establish ADA compliance, and ADA compliance does not excuse a violation of a more protective applicable code.
Before construction, identify whether the site falls under Title II, Title III, Title I, or more than one title; whether the work is new construction, an alteration, or barrier removal; and which state or local code applies. The broader Americans with Disabilities Act framework helps explain how the titles fit together.
Sources
- U.S. Access Board — Chapter 4: Accessible Routes
- U.S. Access Board guide to ramps and curb ramps
- U.S. Access Board guide to accessible routes
- Department of Justice — 2010 ADA Standards for Accessible Design
- Department of Justice — ADA Title II regulations
- Department of Justice — ADA Title III regulations
- EEOC — ADA Titles I and V
- EEOC — Small Employers and Reasonable Accommodation
