What is the minimum clear opening width for an ADA-compliant door?

The minimum clear opening width is 32 inches, measured with the door open to 90 degrees. The measurement is taken between the face of the door and the stop on the latch side of the frame. A standard 36-inch (3’0”) commercial door typically provides 33-1/2 to 34 inches of clear width, which satisfies this requirement. Nominal 32-inch doors generally do not provide a full 32-inch clear opening after accounting for door thickness and hinge geometry.

Are round doorknobs allowed on ADA-accessible doors?

No. ADA Standards require that door hardware be operable with one hand without tight grasping, pinching, or twisting of the wrist. Round doorknobs require a twisting motion and are not compliant. Lever handles, push/pull bars, and panic exit devices are all compliant hardware types for accessible doors.

What is the maximum opening force for an interior accessible door?

Interior hinged doors that are not fire-rated are limited to 5 pounds-force (lbf) maximum opening force. Fire-rated doors are governed by the minimum force required by fire code, which may exceed 5 lbf. Exterior doors have no maximum opening force specified by the ADA Standards. Where fire doors require more than 5 lbf, automatic or power-assisted operators are the standard accessibility solution.

What are the ADA threshold height limits?

Thresholds at accessible doors may not exceed 1/2 inch (12.7 mm) in height. Thresholds higher than 1/4 inch (6.4 mm) must be beveled with a slope no steeper than 1:2. Thresholds at or below 1/4 inch do not require beveling. These limits apply to all accessible door locations regardless of fire rating.

How fast can a door closer close an accessible door?

A door closer on an accessible door must take at least 5 seconds to move the door from 90 degrees open to 12 degrees from the latch (closed position). This is called the sweep period. Spring hinges must take at least 1.5 seconds from 70 degrees to closed. Closers must be adjusted in the field to meet these minimum times.

Do fire-rated doors have to meet ADA requirements?

Yes. Fire-rated doors on accessible routes must meet all applicable accessibility requirements, including clear width, maneuvering clearances, hardware operability, threshold height, and closing speed. The one exception is opening force: fire doors defer to the minimum force required by the fire code authority. Fire rating levels for commercial door assemblies include 20-minute, 45-minute, 60-minute, 90-minute, and 3-hour (180-minute). All components in the assembly must carry matching fire labels.

What is the smooth surface requirement on accessible doors?

The push side of swinging doors on accessible routes must have a smooth, uninterrupted surface within the bottom 10 inches above the finished floor, extending the full width of the door. This allows a wheelchair footrest to push the door open without catching on raised panels or projections. Flush hollow metal doors and flush wood doors inherently meet this requirement.

What is the vision lite height requirement for accessible doors?

When a vision lite (glazed panel) is provided in an accessible door, the bottom edge of the glazing must be no higher than 43 inches above the finished floor. This allows a seated person to see through the door. Vision lites are not required on all doors by accessibility standards, but building codes may require them in certain locations such as corridors in schools and healthcare facilities.

Frequently Asked Questions

Meeting ADA and A117.1 requirements begins at the specification stage. A compliant accessible door assembly is not a single product but a coordinated set of components: door, frame, hardware, closer, threshold, and (where applicable) automatic operator. Each component must individually meet its applicable accessibility requirement, and the assembled unit must function as a compliant whole.

CDF’s ProBuilder tool at cdfdistributors.com allows specification of door width (36-inch standard for accessibility), hardware type (lever handles, push/pull bars, panic devices), closer selection, and fire rating. ProBuilder configurations are reviewed for component compatibility before fabrication. For projects with specific accessibility requirements, call (855) 769-9895 or email sales@cdfdoors.com to discuss specifications with CDF’s technical team.

Specifying ADA-Compliant Door Assemblies

The following table consolidates the primary measurable requirements for accessible swinging doors in commercial applications. This is a summary reference. Consult the full sections above for context, exceptions, and special conditions.

ADA Door Requirements Quick Reference

When two doors in series form a vestibule or airlock on an accessible route, there must be sufficient space between the doors for a wheelchair user to pass through one door and approach the second. The space between the doors must provide a minimum of 48 inches plus the width of any door swinging into the space.

Doors in Series on Accessible Routes (Section 404.2.6)

Automatic door operators are the standard solution for accessible entrances and for any location where the opening force of a fire-rated closer exceeds the 5 lbf maximum for manual doors. Low-energy operators with push-button activation are commonly used at interior fire-rated doors on accessible routes. These operators open the door at reduced speed, hold it open for a set period, and then close it at the required 5-second sweep rate.

Automatic doors are addressed in Section 404.3 of the ADA Standards and A117.1. Automatic doors include full-power operators, low-energy operators, and power-assisted manual doors. When automatic doors are provided on an accessible route, they must meet specific safety and operational requirements.

Automatic Door Requirements (Section 404.3)

When accessibility and vision lite requirements overlap with fire rating constraints, the specification must balance the maximum glazing area allowed by the fire rating against the 43-inch maximum bottom-of-glass height required for accessibility. Narrow-lite and half-lite configurations are common solutions that satisfy both requirements.

Vision lites (glazed openings in doors) are not required by accessibility standards on all doors, but when vision lites are provided, they must meet specific requirements. Additionally, some building codes require vision lites in certain locations (such as corridors in educational facilities) for safety reasons.

Vision Lite (Door Window) Requirements (Section 404.2.11)

Hollow metal flush doors inherently meet this requirement because the door face is a flat steel surface. Stile-and-rail wood doors with raised panels may not comply in the bottom 10-inch zone. When specifying accessible doors, flush doors (whether hollow metal or wood) are the simplest path to compliance with this requirement.

Swinging doors on accessible routes must have a smooth surface on the push side extending the full width of the door and at least 10 inches above the finished floor. This requirement allows a wheelchair footrest to push the door open without catching on raised panels, decorative molding, or other surface projections.

Smooth Surface Requirement (Section 404.2.10)

All components in a fire-rated door assembly must carry matching fire labels: door, frame, hardware, glazing, and any louvers or other penetrations. Mixing rated and non-rated components voids the assembly rating. When a fire-rated door must also be accessible, the specification should address closer force, closing speed, threshold height, clear width, hardware operability, and maneuvering clearances as a coordinated package. Automatic door operators (full-power or low-energy) with fire alarm release are the standard solution for fire-rated doors on accessible routes where the closer force would otherwise exceed 5 lbf.

Fire-rated door assemblies must meet both fire code and accessibility requirements simultaneously. This creates specific specification challenges because fire code requirements for positive latching and self-closing can conflict with accessibility requirements for low opening force and slow closing speed. The following table lists fire rating levels available for commercial hollow metal door assemblies.

Fire-Rated Doors and Accessibility Compliance

The 5 lbf maximum for interior doors is one of the most commonly tested accessibility requirements during building inspections. This measurement applies to the force needed to open the door, not the force needed to operate the hardware (which is separately limited to 5 lbf as noted in the hardware section). Factors that affect opening force include closer spring tension, latch engagement, hinge friction, air pressure differentials, and weatherstripping compression.

Fire doors present a special case. The ADA Standards do not override fire code requirements for minimum closer force. Fire-rated door closers must generate enough force to latch and seal the door for fire and smoke containment. This can result in opening forces above 5 lbf. Where the opening force of a fire door exceeds 5 lbf, automatic door operators or power-assisted closers may be used to achieve both fire code compliance and accessibility.

The force required to open a door is a critical accessibility factor. Excessive opening force prevents people with limited upper-body strength from independently using a door. The standards set different force limits depending on door type and rating.

Door Opening Force Requirements (Section 404.2.9)

This requirement affects closer specification and adjustment. A door closer that slams the door shut in 2 or 3 seconds does not comply, even if all other accessibility requirements are met. Closers must be adjusted in the field to meet the 5-second sweep period. When specifying closers, select models with adjustable sweep and latch speed controls. Backcheck functionality is recommended but not required by code.

For spring hinges (which use a spring mechanism in the hinge barrel rather than a separate closer device), the requirement is 1.5 seconds minimum from 70 degrees to the closed position. Spring hinges are less common in commercial applications but are used in some residential and light-commercial settings.

Doors equipped with closers must close slowly enough to allow a person using a mobility device to pass through safely. The ADA Standards and A117.1 specify minimum closing times measured from a defined starting angle to a defined ending angle.

Door Closing Speed Requirements (Section 404.2.8)

Hardware must be mounted between 34 inches and 48 inches above the finished floor. The standard mounting height for commercial lever hardware is 38 to 42 inches above finished floor, which falls within the accessible range. Locks, latches, and other operable parts of the door must all independently meet the one-hand, no-twisting requirement.

Door hardware on accessible doors must be operable with one hand, must not require tight grasping, pinching, or twisting of the wrist, and must be operable with a force of no more than 5 pounds. These requirements effectively prohibit round doorknobs on accessible doors. The following table summarizes hardware compliance by type.

Door Hardware Operability Requirements (Section 404.2.7)

In practice, this means any threshold higher than 1/4 inch must have a beveled transition, and no threshold at an accessible door may exceed 1/2 inch in total height. Saddle thresholds, which are common at fire-rated openings, must comply with these limits. When specifying fire-rated door assemblies, confirm that the threshold height does not exceed 1/2 inch. Some fire-rated threshold products are specifically designed to meet both the fire rating and ADA height requirements simultaneously.

Thresholds at accessible doorways must be low enough to allow wheelchair and mobility device passage without creating a tripping hazard. The ADA Standards and A117.1 set strict maximum heights based on threshold profile and door type.

Threshold Requirements (Section 404.2.5)

When configuring door assemblies, verify that the adjacent wall construction, cabinetry, equipment, and other obstructions do not encroach on the required maneuvering clearances. Common field issues include drinking fountains, fire extinguisher cabinets, and electrical panels installed within maneuvering clearance zones.

Push Side Maneuvering Clearances

The push side requires less clearance because the user pushes the door away and moves forward through the opening. However, latch-side clearance is still required to allow the user to reach and operate the hardware.

Maneuvering clearances are the floor areas required on each side of a door to allow a person using a wheelchair to approach, open, pass through, and close the door. The required dimensions depend on the direction of approach (front, hinge side, or latch side), whether the door has a closer, and the direction of travel (push or pull). Maneuvering clearances must be level, with a maximum slope of 1:48 (approximately 2 percent) in any direction. The floor surface must be firm, stable, and slip-resistant.

Pull Side Maneuvering Clearances

The pull side of a door requires larger maneuvering clearances because the user must pull the door toward themselves while simultaneously backing up or moving to the side. The following dimensions apply to the pull side of swinging doors.

Maneuvering Clearances (Section 404.2.4)

How to Calculate Clear Opening Width

Clear opening width is measured between the face of the door and the stop on the opposite side of the frame when the door is open to 90 degrees. This measurement is not the same as the nominal door width. A standard 36-inch (3’0”) door provides approximately 33-1/2 to 34 inches of clear width when open to 90 degrees, depending on the hinge type and frame profile. A 32-inch (2’8”) nominal door typically does not provide a full 32-inch clear opening due to the door thickness and hinge geometry projecting into the opening.

For most commercial applications, specifying a 36-inch (3’0”) door is the standard approach to meeting the 32-inch clear width requirement. This provides adequate clear width with standard butt hinges and a hollow metal frame. Offset pivot hinges can increase the clear width for a given door size because they position the pivot point closer to the face of the frame.

The clear opening width is the most fundamental accessibility measurement for any door. It determines whether a wheelchair, walker, or other mobility device can pass through the doorway. The following table summarizes the clear width requirements by door type.

Clear Opening Width Requirements (Section 404.2.3)

The relationship between the ADA, the IBC, and A117.1 is frequently misunderstood. The ADA is a federal civil rights law that establishes minimum accessibility requirements for public accommodations and commercial facilities. The 2010 ADA Standards for Accessible Design contain the specific technical criteria, including Section 404 for doors, doorways, and gates. The International Building Code (IBC) is a model building code adopted by most state and local jurisdictions. The IBC references ICC/ANSI A117.1 as its technical accessibility standard. A117.1 contains the detailed dimensional and performance requirements that builders must follow to satisfy both the building code and federal accessibility law.

In practice, IBC Chapter 11 establishes scoping requirements (which elements must be accessible and how many), while A117.1 provides the technical requirements (dimensions, forces, clearances). Section 404 of A117.1 covers swinging doors, sliding doors, folding doors, revolving doors, and gates. When a jurisdiction adopts the IBC, it simultaneously adopts A117.1 by reference. The ADA Standards and A117.1 are substantially harmonized, though minor differences exist. Where differences occur, the more restrictive requirement applies.

How ICC/ANSI A117.1 Is Adopted by the International Building Code

This code guide is published by CDF Distributors as a reference for commercial door accessibility requirements under federal ADA standards and the ICC/ANSI A117.1 standard as adopted by the International Building Code. CDF Distributors fabricates and ships commercial hollow metal door and frame assemblies from its Nashville, Tennessee headquarters. CDF’s technical team works with architects, general contractors, and facility managers daily on code-compliant door specifications. This guide is intended as an educational reference. Final compliance determinations must be verified with the project’s design professional and the Authority Having Jurisdiction (AHJ).

About This Guide

ADA-compliant doors must provide a minimum 32-inch clear opening width when the door is open to 90 degrees, include hardware operable with one hand without tight grasping or twisting, meet specific maneuvering clearance dimensions based on approach direction, and limit thresholds to 1/2 inch maximum height. These requirements originate from the 2010 ADA Standards for Accessible Design (Section 404) and are technically detailed in ICC/ANSI A117.1, which is the accessibility standard adopted by the International Building Code (IBC). This guide breaks down every measurable requirement for accessible door openings so that architects, contractors, and facility managers can specify and install compliant door assemblies.

CDF Distributors supplies ADA-compliant commercial door assemblies configured through its ProBuilder tool at cdfdistributors.com, where door widths, hardware, and threshold options can be selected to meet accessibility requirements. For project-specific assistance, call (855) 769-9895 or email sales@cdfdoors.com.