Stairwell Reentry Requirements: 3 Triggers, Local Rules, Door Specs
For stair enclosures, model codes set requirements for re-entry, automatic release, or selected re-entry rules. Locked stair-side doors must unlock on three events: a signal from the fire command center, a fire alarm in the area served, and power loss to the lock. Signage must show re-entry status and the nearest re-entry floors.
TL;DR:
- Confirm the locally adopted code edition with the authority having jurisdiction; existing buildings, selected reentry, occupancy, and sprinkler status can change the applicable requirements.
- Signs must identify whether reentry is allowed and name the nearest permitted floors; New York City also specifies bold lettering at least 1/2 inch high.
- Document alarm release, power loss, and central switch tests for every electrified stair door; verify required communication and reset after power returns.
- Check whether electrified hardware needs an access control or burglary resistance listing, and match its lock preparation to the door’s fire rating.
- Have the fire alarm vendor confirm in writing which alarm zones release each stair door before the locksmith orders electrified hardware.
Table of Contents
- What do the model codes and local statutes require?
- How do locking methods and automatic release work?
- What must reentry signs say and where do they go?
- How does selected reentry work, and what are the exceptions?
- How do you run reentry as part of daily operations?
- Which doors and hardware fit a code-compliant stair enclosure?
- Where stairwell projects usually go wrong
- Specification-matched doors, installation, and emergency service
- FAQ
- Sources
What do the model codes and local statutes require?
The core rule is consistent across model codes. NFPA 101 revisions describe requirements for door assemblies in stair enclosures, including re-entry, automatic release, or selected re-entry criteria. New installations must also allow the automatic release to be triggered from the fire command center or an approved central control. A UpCodes summary of the same provision notes that existing-installation exceptions apply in some cases.
Local rules add their own wording. New York City’s administrative code requires stair-side signs to state “NO REENTRY” and name the nearest re-entry floors where re-entry is not on every floor, and its technical policy notice sets how those signs must look. Chicago’s existing-building provision gives owners of older buildings two paths: keep stair doors unlocked from the stair side, or install a fail-safe electronic lock-release system with manual and automatic actuation and two-way communication at set intervals.
Illinois and other states layer their own statutes on top of these model provisions, and adoption dates differ. Confirm the edition your jurisdiction enforces before you specify anything.
How do locking methods and automatic release work?
A mechanical passage set is fine where doors stay unlocked from the stair side. Once you lock a stair door from the stair side, you need electrified hardware that fails safe, meaning it unlocks when power is lost. Industry guidance on the 2024 IBC says lockable stair doors must unlock automatically under three conditions:
- A signal from the fire command center or an approved central switch.
- Activation of a fire alarm signal in any area served by the stairwell.
- Power failure to the electric lock or locking system.
All three matter because each covers a different failure. The command signal lets firefighters open the stairs on demand. The alarm trigger frees occupants and responders during an event. The power-loss trigger covers the case where the building loses electricity before anyone can send a signal. NFPA commentary on fail-safe unlocking stresses that power loss must release the lock.
New electromechanical hardware may need to carry an appropriate listing for access control or burglary-resistant locks. Check the adopted code and product requirements. Hardware choice drives inspection outcomes. Practitioners report that picking the wrong electrified hardware, or failing to meet fail-safe and power-loss requirements, commonly causes immediate compliance failures. If you are weighing a magnetic lock against an electric strike for other openings, this partner comparison covers installer realities, though stair doors must still meet the release rules above.
Pro Tip: Ask your fire alarm vendor to confirm in writing which alarm zones feed the stair door release before the locksmith orders hardware.
What must reentry signs say and where do they go?
Sign wording follows the lock arrangement. Where re-entry is provided, the sign reads “RE-ENTRY ON THIS FLOOR.” Where it is not, the stair-side sign reads “NO RE-ENTRY, NEAREST RE-ENTRY ON THE ___ AND ___ FLOORS.” An emergency-only variant exists for doors that release only during an emergency, so match the text to your actual hardware.
New York City’s technical policy gives the clearest visual standard we know of:
- Contrasting colors with bold lettering.
- Characters at least 1/2 inch high.
- Mounting about five feet above the floor.
- Legible placement on the stair side, with occupancy-side signs where the arrangement calls for them.
Rules also differ by building type and locking arrangement, and the city’s administrative code adds special wording where fail-safe locking systems apply under Building Code Section 1031.4.2. Where a door is not present at a floor, such as at an elevator landing, the sign goes on an adjacent conspicuous place, and the wording changes to fit.
How does selected reentry work, and what are the exceptions?
Selected re-entry lets you keep doors locked on some floors, subject to the requirements in the code edition adopted by your jurisdiction. Check that edition for the applicable conditions. The applicable requirements come from the code families summarized above, so read your adopted edition for exact thresholds.
Common exceptions include existing installations, as noted in the UpCodes summary, and certain occupancies or fully sprinklered buildings in some editions. Chicago’s existing-building section shows another pattern: older buildings get transitional compliance dates and two defined options rather than one rigid rule.
Because adoption and timelines differ, treat every exception as a question for your authority having jurisdiction (AHJ). A short call before design is cheaper than a failed inspection after installation.
How do you run reentry as part of daily operations?
Your emergency action plan (EAP) should record which floors allow re-entry, who can trigger overrides, and how re-entry decisions get made after an event. Guidance from idighardware says the EAP must be tested, documented, and tied to the fire alarm and emergency communications systems. Federal occupant emergency guidance also calls for documented re-entry and “all clear” procedures with exercises to confirm people can re-enter safely when authorized.
A practical routine looks like this:
- Test alarm-initiated release on every electrified stair door.
- Simulate a power failure and confirm each door unlocks.
- Check the firefighter or central release switch.
- Verify two-way communication where your code requires it.
- Log dates, results, and fixes in a single record.
Schedule these tests so the fire alarm vendor, locksmith or electrician, security team, and AHJ agree on the procedure.
Pro Tip: Run the power-loss test last in your sequence, then restore power and confirm every door relocks and resets correctly.
Which doors and hardware fit a code-compliant stair enclosure?
Stair doors need a fire rating, a self-closing hinge, a frame that matches the door, and a lock prep compatible with electrified hardware. We offer 90-minute, 20-gauge fire-rated slabs:
- 32 x 84 steel door slab, 30 x 84 slab, and 32 x 96 slab, each fire-rated for 90 minutes with a single cylindrical prep.
- Flush hollow metal unit and commercial unit, both with frame, self-closing hinges, and cylindrical lockset.
- 32 x 76 unit, 32 x 84 unit, and 36 x 80 unit for other common openings.
Stairwells serve both evacuation and firefighter access, and blocking re-entry can hinder rescue and firefighting, so release behavior is a life-safety detail, not a convenience feature.
On site, plan the power routing and alarm tie-ins early, keep the central release switch reachable, and file the UL listing or equivalent certification for every electrified component. Our guide to fire-rated door ratings and requirements helps you match a rating to the opening.
Where stairwell projects usually go wrong
Most failures we see come from three places: the wrong lock type, wiring that cannot deliver a true fail-safe release, and signs that are missing or worded for a different arrangement. Each is cheap to fix on paper and expensive to fix after the walls are closed. That is why we favor one team handling specification, installation, and testing. Bring your AHJ in before you buy, and review the spec against the adopted code edition first.
— Esteban
Specification-matched doors, installation, and emergency service
We supply fire-rated doors, frames, and hardware, and we install, maintain, and repair them, including emergency replacement with rapid delivery options. Contact us for a site survey, specification matching, and help preparing for your AHJ review. Start with our fire-rated steel doors.
- Doors and frames matched to your stair openings
- Door and frame installation by our team
- Emergency door service when a door fails
FAQ
Do egress stairs have to be enclosed?
Generally yes, stairs that serve as a means of egress are enclosed, and the enclosure doors are where re-entry rules apply. Exact enclosure requirements depend on building height and occupancy, so confirm them with your AHJ.
What is the code for stairs in Illinois?
Illinois and its cities adopt model codes with local amendments, and Chicago has its own stairwell re-entry provision for existing buildings. Check which edition your municipality enforces.
What are the building standards for fire escape stairs?
Interior stair enclosures follow the re-entry, locking, and signage rules covered above, drawn from IBC and NFPA 101. Requirements vary by jurisdiction, so verify them locally.
What type of fire door is commonly used in stairwell enclosures?
Fire-rated steel doors in hollow metal frames are common, with self-closing hinges and a lock prep that suits the chosen hardware. Our hollow metal doors cover this use.
Sources
- Idighardware
- First Revision No. 6570-NFPA 101-2024 Detail
- TECHNICAL POLICY AND PROCEDURE NOTICE # 2/92
- 13-196-084 Stairwell re-entry in existing buildings.