Key takeaways
- Clear opening width is measured from the face of the door to the stop with the door open 90 degrees, never from the leaf width.
- California's 2025 CBC caps operable door hardware at 44 inches above the floor, four inches lower than the federal ADA maximum of 48 inches.
- Door hardware must operate with one hand, without tight grasping, pinching, or wrist twisting, at no more than 5 pounds of force.
- Interior doors in California may require no more than 5 pounds of opening force; required fire doors follow the AHJ minimum and never exceed 15 pounds.
- A closer on an accessible opening needs at least 5 seconds from 90 degrees to 12 degrees; a spring hinge needs at least 1.5 seconds from 70 degrees to closed.
- Scope, the adopted code with local amendments, and the authority having jurisdiction decide which requirements apply to a specific opening.
Clear width
How is clear opening width measured on a commercial door?
The 2025 California Building Code, Chapter 11B, requires door openings on accessible routes to provide a clear width of at least 32 inches, measured between the face of the door and the stop on the strike jamb with the door open 90 degrees. When the opening is more than 24 inches deep, as in a thick wall or short passage, the minimum rises to 36 inches of clear width.
This measurement convention is where most surprises come from. A door ordered as a 36-inch leaf does not deliver 36 inches of clear opening; the door's own thickness at 90 degrees, the hinge geometry, and the frame stop all consume width. A nominal 36-inch door commonly nets out near the 32-inch minimum, so a narrower leaf or a thick retrofit can drop an opening below it.
Before approving door or frame work, confirm the clear width was measured as the code describes and recorded with a photo of the tape in position. That habit prevents a replacement order that reproduces the failing dimension.
Reach and operation
Where must door hardware sit, and how must it operate?
California's 2025 CBC places the operable parts of door hardware between 34 and 44 inches above the finished floor. The federal 2010 ADA Standards allow the same hardware up to 48 inches. That four-inch difference matters in practice: a lever or keypad set at 45 or 46 inches can pass a checklist written to the federal standard and still fail a California inspection; the building is held to the stricter state figure.
Operation is regulated alongside height. Hardware must work with one hand and must not require tight grasping, pinching, or twisting of the wrist, and operating it may take no more than 5 pounds of force. Measure to the operable part itself — the lever, thumbturn, touchpad, or keypad — not to the lock body or the trim plate.
These two rules explain most commercial hardware selection. Levers, push and pull hardware, exit-device touchpads, and electronic trim operate with a closed fist or a forearm; knobs, small thumbturns, and stiff cylinders are the recurring failures.
Force and time
How much force can a door require, and how slowly must it close?
Force and time are where the opening shows itself as one system: the closer, hinges, latch, strike, seals, and any electrified hardware all appear in the reading taken at the lever.
Opening force
In California, interior doors may require no more than 5 pounds of force to push or pull open. Required fire doors are different: they are set to the minimum opening force the authority having jurisdiction allows, and never over 15 pounds. A high reading usually points at binding, seal resistance, building pressure, or an over-sprung closer.
Closer sweep speed
A door closer on an accessible opening must take at least 5 seconds to move the door from 90 degrees open to 12 degrees from the latch. Closers set to snap shut for weather or security routinely fail this timing, and the slower sweep must still close and latch the door completely.
Spring hinges
A door hung on spring hinges along an accessible route must take at least 1.5 seconds to move from 70 degrees open to fully closed. Spring hinges return the door but do not control it like a hydraulic closer, so tension, latching, opening force, and any listing requirements need verification after adjustment.
Floor line
The threshold and the bottom of the door are part of the requirement.
Thresholds at accessible doorways are limited to 1/2 inch in height. This figure fails quietly after unrelated work: new flooring, a surface-mounted replacement threshold, or a weather sill added during a storefront repair can each raise the change in level past the limit without anyone measuring it.
The push side of the door has its own rule: the lower 10 inches must present a smooth surface, so a cane, footrest, or wheel can push the door without catching. Surface bolts, louvers, and projecting trim in that band are common findings; a smooth kick plate covering the bottom of the leaf is the usual fix.
Summary
The numbers inspectors check most, in one table.
| Measurement | California requirement | Frequent failure |
|---|---|---|
| Clear opening width | 32 in minimum, face of door to stop at 90°; 36 in when the opening is more than 24 in deep | Leaf width recorded instead of the measured clear opening |
| Operable hardware height | 34–44 in above the finished floor | Hardware at 44–48 in — inside the federal ADA maximum, above the California cap |
| Hardware operation | One hand; no tight grasping, pinching, or wrist twisting; 5 lbf maximum | Knobs, small thumbturns, and stiff or worn cylinders |
| Opening force | 5 lbf maximum on interior doors; required fire doors at the AHJ minimum, never over 15 lbf | Closer spring force raised to overcome binding, seals, or building pressure |
| Closing speed | 5 seconds minimum from 90° to 12°; spring hinges 1.5 seconds minimum from 70° to closed | Sweep speed set fast for weather or security |
| Threshold | 1/2 in maximum height | New flooring or a surface-mounted threshold raising the change in level |
| Push-side surface | Lower 10 in of the push side smooth | Surface bolts, louvers, or trim in the bottom band |
Specification
What hardware choices do these numbers drive?
Levers and operating trim
The one-hand, no-tight-grasp, 5-pound operation rule is why lever trim, exit-device touchpads, and push and pull hardware dominate commercial specifications. A knob or small thumbturn on an accessible route is usually corrected with a trim or function change on the existing lock family, not a new opening.
Closers and their adjustment
Closer selection and adjustment have to satisfy the 5-second sweep and the opening-force limit while still closing and latching the door completely. If the door needs extra spring force to latch, the fix is the underlying binding, alignment, or seal resistance — not a faster, harder closer.
Thresholds and door bottoms
Low-profile thresholds at or under 1/2 inch, and smooth kick plates covering the lower 10 inches of the push side, resolve most floor-line findings. Both are confirmed against the door's rating and listing before anything is cut or fastened to a labeled door.
Electrified and access hardware
Keypads, electronic trim, and release hardware that a person must operate live in the same 34-to-44-inch band with the same operation rules. Adding access control does not relax any of these measurements; the electrified release is planned with the door, frame, hinges, latch, strike, and closer as one assembly.
Authority
Scope, the adopted code, and the AHJ decide what applies.
The figures in this guide come from the 2025 California Building Code, Chapter 11B, and the federal 2010 ADA Standards; they are general planning information, not project-specific direction. Which doors must meet them depends on scope — new construction, alterations, the affected path of travel, and local amendments each change the answer — and the authority having jurisdiction interprets and approves the result.
Two situations call for verification before any field change. Required fire doors run at the minimum opening force the AHJ allows, with hardware, preparation, and closing behavior controlled by listings and approved plans, so corrections are never improvised on a labeled opening. And when a drawing, a product listing, and the measured field condition conflict, the answer is to confirm with the design documents and the AHJ, not to pick the friendlier number.
Survey
What should a property team record before approving accessibility work?
- Clear opening width measured from the face of the door to the stop at 90 degrees, with a photo of the tape in position
- Height above the finished floor to the operable part of each lever, thumbturn, touchpad, keypad, and release control
- Force gauge readings for hardware operation and door opening force, noted with the weather and HVAC state
- Closer sweep time from 90 degrees to 12 degrees, and spring-hinge closing time from 70 degrees to closed where fitted
- Threshold height and condition, including any change in level introduced by recent flooring or sill work
- The lower 10 inches of the push side: kick plate coverage, surface bolts, louvers, or projecting trim
- Whether the opening is fire-rated, part of required egress, or on an accessible route according to the approved plans
- Visible labels, hardware manufacturers and models, and any prior modifications to the door, frame, or hardware
Common questions
Questions about California door accessibility
Is a 36-inch door automatically compliant in California?
No. Clear width is measured from the face of the door to the stop with the door open 90 degrees, and the leaf loses width to its own thickness, the hinges, and the frame stop. A 36-inch leaf often nets out near the 32-inch minimum, and openings more than 24 inches deep need 36 inches of measured clear width. Measure the opening; do not read the door order.
Why does hardware height differ between the ADA and the California code?
The federal 2010 ADA Standards allow operable door hardware from 34 to 48 inches above the floor, while the 2025 CBC caps it at 44 inches. California buildings are held to the stricter state figure. Specifications and checklists written for national portfolios are the usual reason hardware lands in the 44-to-48-inch band and gets flagged.
What happens if a door needs more than 5 pounds of force to open?
Treat the reading as a symptom of the whole opening. Binding at the hinges or frame, seal resistance, building pressure, or a closer set too strong can each raise it; the correction is diagnosing that cause, not accepting the number. Required fire doors are the exception by design: they follow the AHJ minimum and never exceed 15 pounds.
Do these rules apply to access-controlled and electrified doors?
Yes. Any part a person must operate — electronic trim, keypads, release controls — falls in the same 34-to-44-inch band and must work one-handed at no more than 5 pounds without tight grasping, pinching, or wrist twisting. Adding a reader or an electrified release does not change the door's clear width, force, or closing-speed obligations.
What closing speed should a door closer be set to?
On an accessible opening, at least 5 seconds from 90 degrees open to 12 degrees from the latch, and a spring-hinged door needs at least 1.5 seconds from 70 degrees to closed. Expect a qualified installer to verify the door still closes completely and latches at that speed, since a slow door that no longer secures trades one failure for another.
Sources and further reading
These references support the general technical guidance. The right answer for a specific opening still depends on the property and the authorities responsible for the project.