Delayed Egress Locks: Code Requirements, Signage, and Inspection

A delayed egress lock is legal only when the building code, NFPA 101, and the listing standards line up: the door must release after a 15-second delay (or 30 seconds with approval from the authority having jurisdiction), the building must have automatic sprinklers or approved smoke or heat detection throughout, the occupancy has to appear on the code’s permitted list, and the lock must fail open on fire alarm activation or power loss. Those are the core delayed egress lock code requirements, and every other rule builds on them.

How the Lock Must Function

Pushing or pulling on the door hardware starts an irreversible countdown. Under the 2024 IBC, the timer must begin after force is applied for no more than three seconds, and NFPA 101 caps the required force at 15 pounds.¹ Once the countdown starts, nothing stops it. The door unlocks at the end of the delay whether or not anyone intervenes.

An audible alarm sounds at the door as soon as the countdown begins, both to discourage casual exits and to alert nearby staff. After the delay expires, the door releases. The system cannot automatically rearm itself; a staff member has to manually reset the electronics, which prevents the lock from silently re-engaging on someone still trying to get out.¹

The standard delay is 15 seconds. Extending it to 30 seconds requires explicit approval from the authority having jurisdiction, typically the local fire marshal or building official.¹ Neither the IBC nor NFPA 101 lists the criteria the AHJ must apply, so the request usually turns on the building’s fire protection systems, occupant characteristics, and overall egress design.

Where the Code Allows Them

The IBC works from a permitted-occupancy list. If your building type isn’t on it, delayed egress isn’t an option. Under the 2024 IBC, these systems are allowed in:¹

Group B, business occupancies such as offices and professional buildings
Group F, factory and industrial occupancies
Group I, institutional occupancies including hospitals, nursing homes, and correctional facilities
Group M, mercantile occupancies such as retail stores
Group R, residential occupancies including apartments and assisted living
Group S, storage occupancies
Group U, utility and miscellaneous structures
Group E classrooms, only where the classroom occupant load is fewer than 50
Courtrooms in Group A-3, on exit or exit access doors other than the main exit, and only in buildings equipped throughout with automatic sprinklers

Two categories are effectively barred. Group H high-hazard buildings, where rapid fire spread or chemical release makes any delay unacceptable, cannot use them. Group A assembly occupancies (theaters, stadiums, concert halls) are also excluded, with the narrow courtroom carve-out as the only exception.¹ Educational occupancies are largely off-limits too: the classroom exception only covers rooms under 50 occupants, so main school exits, gym doors, auditorium exits, and busy corridor doors cannot carry a delayed egress lock. Even in a qualifying courtroom, the main exit or primary exit access door must stay unlocked so at least one primary path remains unobstructed.

Fire Protection Is a Prerequisite

Regardless of occupancy, the building must be protected throughout by either an automatic sprinkler system or an approved automatic smoke or heat detection system before a delayed egress lock can be installed.¹ The reasoning is straightforward. If people are being made to wait to exit, the building has to detect a fire quickly enough to override the delay before that wait causes harm.

Fail-Safe Release Requirements

The lock has to release instantly, bypassing the delay, on any of three events:

Fire alarm or sprinkler activation. NFPA 101 goes further, specifying that activation of a single heat detector or two smoke detectors on an approved supervised fire detection system triggers release.²
Power failure. The system is fail-safe by design. If power to the locking device is lost, the lock releases. There is no battery backup that keeps the door locked during an outage.¹
Manual override from a fire command center or another approved location, so responders can clear every secured door at once.

Once a fire alarm has released the doors, they must stay unlocked until the fire alarm system is manually reset by authorized personnel.³ Doors cannot re-lock while an evacuation is still underway.

Hardware Listing and Signage

New delayed egress locking hardware must be listed under ANSI/UL 294, the standard for access control system units. Section 68 of UL 294 covers delayed egress equipment and operation.⁴ A typical installation pairs a UL 294-certified access control panel with a locking mechanism certified under UL 1034, which covers the physical performance of the lock. Specifying both listings together is standard practice.

NFPA 101 also requires emergency lighting on the egress side of any door with a delayed egress lock, so the hardware and signage remain visible during a power disruption.²

A sign must be mounted on the door, above and within 12 inches of the exit hardware. Under the 2024 IBC, the wording depends on which way the door swings:¹

Doors swinging in the direction of egress: “PUSH UNTIL ALARM SOUNDS. DOOR CAN BE OPENED IN 15 [30] SECONDS.”
Doors swinging against the direction of egress: “PULL UNTIL ALARM SOUNDS. DOOR CAN BE OPENED IN 15 [30] SECONDS.”

The sign must meet the visual character requirements of ICC A117.1. NFPA 101 adds that lettering must be at least one inch high with a minimum stroke width of one-eighth of an inch on a contrasting background. In Group I occupancies where patients’ clinical needs require restraint or containment, the sign may be omitted with AHJ approval, since posted exit instructions could work against the facility’s care objectives.¹

Delayed Egress Is Not Controlled Egress

The two are frequently confused, and the code requirements are different. A delayed egress lock releases automatically when the countdown ends. A controlled egress lock does not. It stays locked until a staff member unlocks it, or until the fire alarm or a power failure releases it.

Controlled egress is limited to Group I-1 and I-2 occupancies, primarily hospitals and nursing homes, where patients’ clinical conditions require containment. Memory care units and psychiatric wards typically use controlled egress rather than delayed egress, because a 15-second delay would not prevent a disoriented resident from walking out.² Controlled egress carries its own separate requirements, including that staff must be able to unlock the doors readily at all times. If you are securing a dementia unit, you almost certainly need controlled egress, and a different set of code sections applies.

OSHA Applies Independently in Workplaces

Building code compliance does not automatically satisfy OSHA. Under 29 CFR 1910.36, employees must be able to open any exit route door from the inside at all times without keys, tools, or special knowledge, and exit doors must be free of any device or alarm that could restrict emergency use if the device fails.⁵

OSHA allows a narrow exception for mental health, correctional, and penal facilities, where interior locking is permitted if supervisory personnel are continuously on duty and the employer maintains an emergency evacuation plan.⁵ Everywhere else, a delayed egress lock in a workplace has to be configured so its fail-safe features (fire alarm release, power failure release, manual override) satisfy the rule that the device cannot restrict emergency egress if it malfunctions. A lock that fails in the locked position during an emergency exposes the employer to OSHA citations independent of any local building code enforcement.

Annual Inspection and Testing

NFPA 101 requires that delayed egress locks be inspected and functionally tested at least once a year.² Each test has to verify that the timer activates on the correct force, the alarm sounds, the lock releases after the proper delay, fire alarm integration triggers immediate release, and the system fails safe on power loss.

A written, performance-based program can extend the testing interval beyond 12 months, but only with documentation justifying the longer cycle. Whatever the interval, every inspection has to be performed by someone with demonstrable working knowledge of the specific door assembly being tested. Each test must be documented in a written, signed record and kept available for review by the local fire marshal or building official.² A simple log with dates, results, and the technician’s name is what an inspector will ask for.

1
International Code Council. 2024 International Building Code Chapter 10 Means of Egress
2
National Fire Protection Association. NFPA 101 Life Safety Code 2024 Edition
3
International Code Council. International Building Code Delayed Egress Locking Systems
4
UL Solutions. Proper Application of UL Standards for Controlled or Delayed Egress Locking Devices – UL 294 and 1034
5
Occupational Safety and Health Administration. Design and Construction Requirements for Exit Routes