The ADA passage requirements set the dimensions every accessible route in a public accommodation or commercial facility must meet: at least 36 inches of clear width, a 60-inch turning space, doorways with 32 inches of clear opening, ramps no steeper than 1:12, stable and slip-resistant floors, and strict limits on objects that stick out into the path. These rules come from the 2010 ADA Standards for Accessible Design and apply in full to new construction and alterations under Title III of the Americans with Disabilities Act.1ADA.gov. Introduction to the Americans with Disabilities Act
Corridor Width and Passing Space
An accessible route must be at least 36 inches wide along its entire length.2U.S. Access Board. ADA Standards – Chapter 4 Accessible Routes That width lets one wheelchair user travel without scraping walls or fixtures. A pinch point, like a door frame or structural column, may narrow the route to 32 inches, but only for a stretch no longer than 24 inches, and consecutive pinch points must be separated by at least 48 inches of full-width passage.
Two wheelchairs cannot pass each other in a route narrower than 60 inches. Where the route stays below that width, passing spaces are required at least every 200 feet. A passing space measures either 60 inches by 60 inches or takes the shape of a T-intersection whose base and arms each extend at least 48 inches past the crossing point.
Width at Turns
A 36-inch corridor works in a straight line but fails at a 90-degree corner. Where one 36-inch passage turns into another 36-inch passage, each leg must extend at least 48 inches past the inside corner of the turn. Without that depth, a wheelchair user runs out of room mid-turn. Hallways that meet the width rule on paper can still trap someone at every bend.
Turning Space for Reversing Direction
People also need room to turn around completely. The standards allow two shapes. The first is a circular space at least 60 inches in diameter, which lets both manual and power wheelchairs rotate in place. The second is a T-shape fitting inside a 60-inch square, with the base and both arms at least 36 inches wide, used for a three-point turn.2U.S. Access Board. ADA Standards – Chapter 4 Accessible Routes Restrooms, dressing rooms, and dead-end corridors are where this space matters most. A room without one leaves a wheelchair user unable to exit the way they came in.
Doorway Clear Width and Hardware
A doorway must provide a clear opening of at least 32 inches, measured between the face of the door and the opposite stop with the door open to 90 degrees.2U.S. Access Board. ADA Standards – Chapter 4 Accessible Routes The door itself eats into the frame, which is why the measurement is taken with the door swung open. When the opening sits in a wall or recess deeper than 24 inches, the clear width increases to 36 inches to compensate for the harder approach angle.3U.S. Access Board. Guide to the ADA Accessibility Standards – Chapter 4 Entrances, Doors, and Gates
Handles, pulls, and latches must operate with one hand and cannot require tight grasping, pinching, or twisting of the wrist. Lever handles, push plates, and loop pulls all qualify; round knobs generally do not. Interior hinged doors may require no more than 5 pounds of force to push open, measured as the continuous force needed to swing the door through its arc rather than the initial pull against the seal. Fire doors are exempt from that 5-pound cap because fire codes may set a higher minimum, and exterior hinged doors have no specified maximum force.
Doors with closers must take at least five seconds to swing from 90 degrees down to 12 degrees. Those seconds matter for anyone transferring from a wheelchair or moving on forearm crutches, who needs time to clear the opening before the door pushes back. Compliant hardware often gets defeated in the field by closer tension cranked too high or springs that have stiffened with age.
Ramps, Landings, and Handrails
Any change in elevation along an accessible route that is too steep for a walking surface requires a ramp. The maximum running slope is 1:12, one inch of rise for every 12 inches of horizontal run, and no single ramp run may rise more than 30 inches before a landing.4U.S. Access Board. ADA Accessibility Standards A ramp gaining 30 inches of height therefore stretches at least 30 feet, which is why accessible ramps consume so much floor area.
Landings sit at the top and bottom of every ramp run. Each landing must be at least 60 inches long and at least as wide as the ramp leading to it. Where a ramp changes direction at a landing, the landing must be at least 60 inches by 60 inches. Landings must be essentially flat, with a slope no steeper than 1:48.
The clear width of a ramp run, measured between handrails when handrails are provided, must be at least 36 inches.5U.S. Access Board. Guide to the ADA Accessibility Standards – Ramps and Curb Ramps Handrails must sit between 34 and 38 inches above the ramp surface and extend horizontally at least 12 inches past both the top and bottom of the run, giving users something to grip during the transition to the level landing. Existing buildings with limited space may qualify for a slightly steeper slope than 1:12, but only when the standard slope physically will not fit, and the relaxed slopes still require handrails and landings.
Floor Surfaces and Openings
Every floor and ground surface along an accessible route must be stable, firm, and slip-resistant.6U.S. Access Board. Americans with Disabilities Act – Chapter 3 Building Blocks Loose gravel, thick sand, and deep-pile carpet fail on stability or firmness and make wheelchair travel exhausting. Carpet must be securely attached with either a firm cushion, a firm pad, or no pad, and pile height cannot exceed 1/2 inch. Exposed carpet edges must be fastened along their entire length with trim.
Vertical changes in level, like the transition between two flooring materials, are permitted up to 1/4 inch without any treatment. Changes between 1/4 inch and 1/2 inch must be beveled at a slope no steeper than 1:2. Anything above 1/2 inch is treated as a ramp and must meet the full slope, landing, and handrail rules.
Grates and drainage covers on an accessible route cannot have openings wider than 1/2 inch in any direction, or a wheelchair caster or cane tip can drop through. Where grate slots are elongated, the long dimension must run perpendicular to the dominant direction of travel so wheels cross the narrow way.7U.S. Access Board. Guide to the ADA Accessibility Standards – Chapter 3 Floor and Ground Surfaces
Protruding Objects and Overhead Clearance
Objects mounted on walls or posts can turn into head-height hazards for people who use canes. When the leading edge of an object sits between 27 and 80 inches above the floor, it may not stick out more than 4 inches into the path of travel.8U.S. Access Board. Guide to the ADA Accessibility Standards – Chapter 3 Protruding Objects A cane swept along the floor catches obstacles near the ground, but an object at chest height with nothing below it stays invisible until it hits the person. Anything mounted below 27 inches is within cane-sweep range and faces no protrusion limit.
Overhead clearance along every circulation path must be at least 80 inches. Where a ceiling, stair underside, or sloped wall drops below that height, a fixed barrier with its leading edge no higher than 27 inches must sit beneath the low area to redirect people before they walk into it. Planters, benches, and guardrails all work as barriers. The protrusion rules apply to every circulation path, not only routes designated as accessible.
How the Rules Apply to Existing Buildings
All of these measurements apply in full to new construction and to alterations. Existing buildings sit under a different standard. Under Title III, businesses in existing facilities must remove architectural barriers where doing so is “readily achievable,” meaning it can be accomplished without much difficulty or expense.9Office of the Law Revision Counsel. 42 USC 12182 What counts as readily achievable scales with the business’s size and resources, so a national chain faces a much higher bar than an independent shop on the same block.
An older building with 28-inch doorways or no ramp is not automatically in violation, but the owner has to be able to show that widening the doorways or adding a ramp would be genuinely difficult or costly for a business of that size. Where full compliance is not readily achievable, the business must still make its services available through alternative methods, such as curbside assistance or moving a service to an accessible area. Older buildings are not grandfathered in entirely, which is where many owners get it wrong.
Penalties and the Small-Business Tax Credit
The Department of Justice enforces Title III and can bring lawsuits against businesses whose facilities fall short.10United States Department of Justice. Disability Rights Section Private individuals can also sue directly without waiting for a federal investigation. Civil penalties can reach $75,000 for a first violation and $150,000 for subsequent violations, with periodic adjustments for inflation.
Small businesses can offset the cost of accessibility work through the Disabled Access Credit under Internal Revenue Code Section 44. The credit equals 50 percent of eligible access expenditures that exceed $250 but do not exceed $10,250 in a year, for a maximum annual credit of $5,000.11Office of the Law Revision Counsel. 26 USC 44 – Expenditures to Provide Access to Disabled Individuals To qualify, the business must have earned $1 million or less in the prior year or had no more than 30 full-time employees.12Internal Revenue Service. Tax Benefits of Making a Business Accessible to Workers and Customers with Disabilities Eligible expenses include removing barriers, providing accessible formats, and buying adaptive equipment. A small retailer spending $6,000 to widen a doorway and install a compliant ramp would see $2,875 of that cost covered by the credit.