ADA Door Clear Width: Why a 32-Inch Nominal Door Fails the 32-Inch Requirement
Key Numbers at a Glance
| ADA minimum clear width | 32 inches (§404.2.3), measured door face to stop at 90° |
|---|---|
| Standard 1-3/4" door leaf reduction | −1.75 inches from nominal opening |
| Latch-side door stop reduction | −0.625 inches (steel frame typical) |
| 32" nominal door actual clear | ~29.6 inches → FAILS ADA |
| 34" nominal + swing-clear hinge | ~33.4 inches → PASSES ADA |
| Swing-clear hinge cost | $245–$525 installed (vs $4,378+ for door widening) |
The ADA §404.2.3 Measurement Standard
The U.S. Access Board defines ADA door clear width as the distance between the face of the open door and the latch-side stop, with the door at exactly 90 degrees. This is a live measurement of usable passage, not a nominal dimension from a product catalog.
With a standard butt hinge, the pivot axis sits at the door edge. At 90 degrees, the door leaf hangs perpendicular inside the frame opening, occupying part of the required clear width. A 1-3/4-inch thick door leaf subtracts 1.75 inches from usable passage before the stop depth is even considered.
Clear Width Math by Door Size
32.000 − 1.750 (leaf) − 0.625 (stop) = 29.625" → FAILS (short 2.4")
34" nominal + standard hinge:
34.000 − 1.750 − 0.625 = 31.625" → FAILS (short 0.4")
34" nominal + swing-clear hinge:
34.000 − 0.000 (leaf clears) − 0.625 = 33.375" → PASSES
36" nominal + standard hinge:
36.000 − 1.750 − 0.625 = 33.625" → PASSES
How Swing-Clear Hinges Recover the Width
A swing-clear hinge uses an offset barrel positioned toward the room side of the door. This geometry causes the door leaf to travel on a wider arc as it opens, swinging completely past the frame by 90 degrees. The leaf face ends up flush with or slightly beyond the frame face — not inside the opening.
Result: the 1.75-inch door leaf is no longer deducted from the ADA measurement. Only the stop depth remains, giving back approximately 1.75 inches of clear width. Brands offering swing-clear models include Hager (BB1260), McKinney (T4A3789), Stanley commercial hardware, and Waterson (K51L — which adds hydraulic self-closing speed control for combined ADA width + closing-speed compliance).
ADA vs. ICC A117.1-2017
| Attribute | ADA (2010 Standards) | ICC A117.1-2017 |
|---|---|---|
| Clear width minimum | 32 inches at 90° | 32 inches at 90° (identical) |
| Standard type | Federal civil rights law | Technical standard via IBC |
| Enforcement | DOJ litigation | Local building department |
| Deep opening (>24" wall) | 36 inches clear required | 36 inches clear required |
Passing a local IBC/A117.1 inspection does not guarantee ADA compliance. ADA enforcement can occur years after project completion through DOJ investigation or private litigation.
Cost Comparison
| Solution | Typical Total Cost | Structural Work? |
|---|---|---|
| Swing-clear hinges (3-set, installed) | $245–$525 | No |
| Waterson K51L self-closing swing-clear | $351–$491 | No |
| Door widening (national average) | $4,378 (range $701–$8,056) | Yes |
| Occupied commercial widening | Up to $15,000+ | Yes + infection control |
See the full decision guide: Swing-Clear Hinge vs. Door Widening: The $14,000 ADA Retrofit Math.
Frequently Asked Questions
ADA §404.2.3 defines it as the opening between the face of the door and the latch-side stop with the door at 90 degrees. Minimum is 32 inches. This is the actual usable passage, not the nominal door size.
No, not with standard hinges. A 32-inch nominal door with standard butt hinges produces approximately 29.6 inches clear at 90 degrees — about 2.4 inches short of the ADA 32-inch minimum.
A 36-inch nominal opening safely meets the 32-inch ADA clear width with standard hinges (yields ~33.6 inches clear). A 34-inch nominal with standard hinges yields only ~31.6 inches and falls short. With swing-clear hinges, a 34-inch nominal opening (~33.4 inches clear) meets ADA.
They move the open door leaf completely outside the frame opening, eliminating the 1.75-inch leaf-thickness deduction from clear width. This recovers enough width to bring marginal 34-inch nominal openings into ADA compliance without structural work.
The technical requirement is the same (32 inches at 90 degrees). Enforcement differs: ADA is enforced by DOJ; A117.1 by local building departments. A building can pass local inspection and still face ADA litigation.
- U.S. Access Board. ADA §404.2.3. access-board.gov
- ICC A117.1-2017 §404.2.3. International Code Council.
- HUD Fair Housing Design Manual Ch. 3. huduser.gov
- HomeAdvisor. Doorway Widening Cost 2025. homeadvisor.com
- Hager BB1260. hagerco.com
- Waterson K51L. watersonusa.com
Verified 2026-04-16.