Perspectives · Codes
ADA in practice: the numbers that shape every plan.
The handful of ADA figures that actually decide a floor plan — taught plainly, for designers and clients alike.
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The numbers that actually shape a plan.
ADA compliance fills a thick book — but the great majority of what decides a real floor plan comes down to a handful of numbers you can carry in your head. This is the working set we design to: the ones that fix where a door goes, how wide a hall runs, and whether a counter works for someone seated. It’s a teaching guide, not the code — always confirm the specifics against the current ADA Standards and your local building code.
Chapter A · Doors
Every door has a footprint bigger than the door.
The opening is the easy part; the room around it is what people forget.
- 32″ clear opening, minimum, with the door open 90°.
- Maneuvering room at the latch: about 18″ on the pull side and 12″ on the push side (front approach, door with closer and latch) — the space a wheelchair needs to reach the handle.
- Threshold no taller than ½″; interior doors open with 5 lbs of force or less.
- Hardware you can work with a closed fist (a lever, not a knob), mounted 34″–48″ up.
- Two doors in a vestibule: 48″ of clear space between them, plus the door swings.
Why it matters: A door that meets width but has no maneuvering clearance is simply unusable — and the clearance is the part that gets value-engineered away first.
Chapter B · Corridors, routes & turning
Room to travel, room to turn.
Two numbers do most of the work here: 36 to get through, 60 to turn around.
- Accessible routes stay 36″ wide (they may pinch to 32″ for a short length, like a doorway).
- Wherever someone may need to turn around, leave a 60″ (5-foot) turning circle — or a T-shaped space with 36″ arms.
- On long runs narrower than 60″, add a 60″×60″ passing space at least every 200 ft.
Why it matters: 60″ is the wheelchair turning radius — the quiet number that sizes lobbies, restrooms, and the ends of corridors. Cramped turns are what make a space feel inaccessible even when the widths pass.
Chapter C · Restrooms
Where the most numbers live.
Get the clear floor spaces and the compartment right first; the fixtures follow.
- Lavatory / sink: rim no higher than 34″, with knee clearance under it (27″ high, 30″ wide, up to ~25″ deep) and a 30″×48″ clear floor space to roll up. Insulate the pipes; faucet operable with a closed fist or automatic.
- Accessible toilet compartment: at least 60″ wide; toilet centered 16″–18″ off the side wall; seat 17″–19″ high; grab bars at 33″–36″; a 32″ clear door that doesn’t swing into the required floor space.
- Reach & mirrors: dispensers and controls within the 15″–48″ reach range; mirror bottom no higher than 40″.
Why it matters: The restroom is where a plan passes or fails an accessibility review. Nail the 30″×48″ clear spaces and the 60″ compartment, and the rest falls into place.
Chapter D · Counters — reception, service & breakroom
A counter everyone can use.
Two heights to remember: 36 for a transaction, 34 for a work surface.
- A transaction / service counter (reception, checkout) needs an accessible section no higher than 36″ and at least 36″ long — or a companion surface at that height right beside it.
- A work counter used seated (a breakroom counter, a workstation) should be ≤34″ high with knee & toe clearance under it (27″ knee height, 30″ wide, ~19″ deep) and a 30″×48″ approach.
- Appliances, sinks, and controls within the 15″–48″ reach; at least a portion of every run accessible.
Why it matters: “Add an accessible counter later” almost always becomes an awkward bolt-on. Designed in from the start, it disappears. For the tricky reception case, see our deep-dive: a useful guide to ADA reception & service counters.
The through-line
The minimum is the floor.
These numbers are where we start, not where we stop. Designed past the minimums — a little more turning room, a slightly lower counter, a step-free path by default — accessibility stops feeling like a special accommodation and just becomes a space that works better for everyone. That’s the whole idea. More on how we think about it → · Companion primer: Fire Exits & Egress Paths → · How ADA & fire safety work together →