How to Measure Clear Width at an Accessible Doorway

Door size and clear opening are not the same measurement. The clear opening is the usable passage when the door is open, after accounting for the door leaf and stop.

The standard measurement

ADA Standards § 404.2.3 requires a minimum 32-inch clear width for door openings. For a swinging door, measure from the face of the door to the opposite stop with the leaf at 90 degrees. Do not measure the rough opening, nominal slab width, or distance between jambs with the door closed.

Deep openings and projections

If an opening is more than 24 inches deep, the standard generally requires a 36-inch minimum clear opening. Projections into the required clear width are limited by height: below 34 inches above the finish floor, projections are not permitted; between 34 and 80 inches, projections may not exceed 4 inches. The standard includes limited exceptions, such as for certain altered doorways.

Field measurement steps

1. Open the swinging door to 90 degrees.
2. Identify the face of the door and the opposing stop.
3. Measure the clear horizontal space between those points at the required location.
4. Check opening depth and any hardware or projection into the clear path.
5. Review maneuvering clearance, thresholds, and hardware separately; clear width alone does not establish full compliance.

Field sequence: measure the actual opening

Identify the opening type and measure after the door, frame, stops, and hardware are installed. For a swinging door, open it to 90 degrees and measure from the face of the door to the stop. Do not use the nominal leaf width or rough opening. The general minimum clear opening is 32 inches. If the opening is more than 24 inches deep, the Standards generally require 36 inches clear. Check the precise section and exceptions for the configuration rather than measuring a single dimension and declaring the doorway compliant.

Look for projections into the opening and verify the measurement at the heights addressed by §404.2.3. The Standards limit certain projections within the clear width; a closer arm, panic hardware, or thick stop can change the usable passage. Double-leaf doors require at least one active leaf to meet the clear-width and maneuvering-clearance requirements. Automatic doors have separate provisions, including measurements in power-on and power-off modes.

A field example: a 36-inch nominal door leaf may provide less than 32 inches because of the frame, stop, and open-door position. Conversely, the nominal dimension alone cannot establish noncompliance if the actual measured clearance satisfies the rule. Use a rigid tape at the correct points, keep the door at 90 degrees, and document the result with the hardware installed. Recheck if a replacement closer or stop is added later.

Door width is only one part of access. Check maneuvering clearance on the pull and push sides, door swing, threshold, floor level, and approach route. A wide doorway can still be unusable if furniture or a recessed wall blocks required maneuvering space. Coordinate framing rough openings early so accessible clearance does not depend on trimming a rated frame or removing specified hardware after installation.

For inspection records, name the opening, identify the door type, note the angle and measurement points, record clear width and depth, and capture photographs. If the opening fails, do not shave the door or alter a labeled assembly without approval. Ask the design professional to resolve whether a compliant leaf, frame, hardware configuration, or alternate approved detail is required.

Door configuration and measurement traps

Measure the net opening with the door at the specified open position; do not subtract a nominal allowance from the leaf width. The stop, hinge geometry, door thickness, and projections can all reduce usable clear width. Where a door is recessed, the door opening may meet its width while approach maneuvering clearance fails because the latch-side wall projects into the space. Check §404.2.4 alongside §404.2.3 for manual doors.

For pairs, verify which leaf is active and whether its opening provides required width without relying on an inactive leaf. Confirm the hardware permits the required opening and that panic hardware, guards, or security devices do not create a prohibited projection. For automatic doors, use the separate measurement rules and confirm the opening in each required power condition. A tape reading for a manual swing door should not be reused to certify a sliding or automatic assembly.

A door replacement can change clear width even when the rough opening remains unchanged. New closers, stops, hinges, seals, or a thicker leaf may reduce passage. Include a post-hardware measurement in the punch list and require reinspection after any adjustment. Do not remove a required fire-door component simply to gain an inch; obtain an approved compliant door and hardware package.

Record the opening ID and field condition, not just “pass.” A useful log includes the measurement reference, door angle, opening depth, active leaf, floor finish, threshold, projection observations, and photographs. If the door cannot be held safely at 90 degrees, use a method that reliably captures the required measurement and note the limitation. Get an accessibility professional’s resolution for borderline conditions.

Closeout and accessibility review

Inspect after final hardware and floor finishes are installed. The rough opening and nominal door size are not the measured clear opening. Record the actual opening, depth, door position, projections, active leaf, and threshold so a reviewer can reproduce the measurement.

If an adjustment is needed, prefer an approved hardware or door configuration that preserves the labeled assembly. Do not remove stops, seals, closers, or fire-door components without an approved detail.

Treat width as one checklist item alongside maneuvering space, opening force, hardware, threshold, and the connecting route. A passing clear-width number does not certify the entire accessible route.

Exam takeaway

The common rule is 32 inches clear, measured door face to stop at 90 degrees for a swinging door. A deep opening over 24 inches generally requires 36 inches. Check exceptions and other door requirements separately.