In New York City, emergency lighting must keep your egress paths lit for at least 90 minutes after a power failure. Initial illumination must average at least 1 footcandle along the path, with no point below 0.1 footcandle. Exit signs must be lit at all times and tied to an emergency power source. The Department of Buildings (DOB) reviews the design. The Fire Department (FDNY) checks that it still works once the building is occupied.
This guide is for building owners, property managers, architects and installers who need to know what the NYC Building Code asks for, who enforces it, and where projects most often go wrong.
TL;DR
- Means of egress lighting on emergency power must run for at least 90 minutes, starting at a 1 footcandle average and 0.1 footcandle minimum.
- Levels may fall to a 0.6 footcandle average and 0.06 footcandle minimum by the end of the 90 minutes. The maximum-to-minimum ratio must stay at or below 40 to 1.
- Exit signs must be illuminated at all times, be UL 924 listed if internally lit, and be connected to emergency power for 90 minutes.
- DOB governs design and installation. FDNY governs maintenance, testing and obstruction of egress in existing buildings, so keep test records.
- Existing buildings are not automatically exempt. Alterations, changes of use and assembly spaces often trigger upgrades.
Table of Contents
- Who enforces emergency lighting in NYC
- What the Building Code requires for egress illumination
- Exit sign requirements in NYC
- Emergency power is bigger than lighting
- Permits: no separate emergency lighting filing
- What FDNY inspectors look for
- Existing buildings are not automatically exempt
- OSHA also applies to workplaces
- A step-by-step approach for a retrofit or new design
- Our perspective
- Getting engineering support
- FAQ
- Sources
Who enforces emergency lighting in NYC
Two agencies matter, and they look at different moments in a building's life.
The DOB enforces the Building Code during design, permitting and construction. The Fire Commissioner shares enforcement authority, and the FDNY is responsible for the maintenance of emergency lighting, exit signs and keeping egress paths unobstructed in existing buildings, as the DOB's Chapter 27 materials describe. In practice:
- Design stage: your plans must show egress illumination and exit signs that comply with Building Code Chapter 10, with the emergency power source meeting Chapter 27 and the NYC Electrical Code.
- Operating stage: an FDNY inspector walks the building and expects working signs, visible emergency lighting and documentation.
A design that passes plan review can still fail in the field if the batteries are dead, a sign is blocked or no one logged the last test. Owners need to satisfy both agencies, one with drawings and the other with discipline.
What the Building Code requires for egress illumination
Section BC 1008 covers means of egress illumination. Normal illumination must be provided in the egress path, and under emergency power the lighting must meet Section 1008.3. That section is where the numbers live.
Duration
Emergency lighting must provide illumination for at least 90 minutes when the normal supply fails. Many people remember the 60-minute figure used in other model codes, so verify your project's code edition and do not assume.
Footcandle levels
| Measure | Required level |
|---|---|
| Initial average along egress path | At least 1 footcandle |
| Initial minimum at any point | At least 0.1 footcandle |
| Average at end of 90 minutes | At least 0.6 footcandle |
| Minimum at any point at end of 90 minutes | At least 0.06 footcandle |
| Maximum-to-minimum ratio | No more than 40 to 1 |
These values come from BC 1008.3 as published in the NYC code library, and the figures are measured along the path of egress, usually at the floor.
Uniformity is where designs fail
Designers often check the 1 footcandle average and stop there. The code also sets a floor of 0.1 footcandle at every point and limits the ratio between the brightest and dimmest spots to 40 to 1. A corridor with one bright fixture near a door and a dark stretch farther along can hit the average and still fail the minimum or the ratio.
A worked example: say a 60-foot corridor has fixtures at each end that produce 4 footcandles directly below and 0.05 footcandle in the middle. The average might look acceptable on paper, yet the middle falls under the 0.1 minimum and the 4 to 0.05 spread is 80 to 1, double the allowed ratio. Adding one fixture mid-corridor or changing the optics fixes both problems. A photometric layout catches this before anything is installed.
Decline over time
The code lets levels decline over the 90 minutes, which matters for battery-backed fixtures. Output drops as the battery discharges. Your design must show that even at minute 90, you still sit at 0.6 average and 0.06 minimum. Aging batteries erode that margin, which is one reason test records matter.
Exit sign requirements in NYC
Exit signs fall under Section BC 1013. The points that matter most to owners and installers:
- Always lit. Exit signs must be internally or externally illuminated at all times.
- Internally illuminated signs. Electrically powered, internally lit signs must be listed and labeled to UL 924 and have red letters.
- Externally illuminated signs. The face must have an intensity of at least 25 footcandles.
- Emergency power. All exit signs must be connected to an emergency power system able to supply power for at least 90 minutes.
The exit sign illumination provisions also include occupancy-specific exceptions, for example for certain seating areas in Groups A-4 and A-5, so check the occupancy group before you count signs.
The NYC version of the sign wording is also stricter than what many national suppliers ship. A sign that is acceptable in another state is not automatically acceptable here, so confirm the product against the NYC provisions before purchase. If you are replacing signs, do not assume a like-for-like swap from a catalog will pass.
Emergency power is bigger than lighting
Emergency lighting rarely stands alone. Chapter 27 emergency power requirements typically reach beyond egress lights and exit signs to items such as elevator car lighting, fire alarm and detection systems, and electrically powered fire pumps, according to this summary of the code. Emergency and standby power installations must follow the NYC Electrical Code, NFPA 110 and NFPA 111.
That has design consequences:
- Sizing the source. If you add loads to a generator or battery system, the total must still carry every required emergency load.
- Circuit separation. Emergency lighting circuits are generally kept distinct from general lighting and power, so a general fault does not take down egress lighting.
- Coordination. Mechanical, electrical and fire protection scopes touch the same risers, rooms and fuel or ventilation needs. Early coordination between the engineer, architect and electrical installer avoids rework.
This is why a lighting-only fix sometimes turns into a larger project. A change to a generator can ripple into ventilation for the generator room, fuel storage and fire protection interfaces.
Permits: no separate emergency lighting filing
There is no standalone DOB application for emergency lighting. Compliance is generally folded into broader electrical work. Under Buildings Bulletin 2023-011, electrical contractors certify that their design and installation comply with the Building Code, or they submit a sealed letter from a professional engineer or registered architect confirming code compliance in order to obtain a certificate of electrical inspection.
In plain terms:
- If you are doing a renovation, the emergency lighting design is part of the drawings and the electrical permit package.
- If you are fixing deficiencies in an existing building, your electrician and a licensed design professional should agree on what is being changed and who certifies it.
- When a sealed letter is needed, the engineer must be able to stand behind measured or calculated results, not just fixture counts.
What FDNY inspectors look for
Once the building operates, FDNY focus shifts to function and records. Inspections frequently check for working exit signs, visible emergency lighting and system test documentation. FDNY's document and applicant requirements show how many building system tests depend on paperwork being ready, so plan lead time and gather documents before anyone arrives.
A practical routine for property managers:
- Keep a logbook. Record each periodic test: date, who performed it, what was checked, and what was fixed.
- Test on a schedule. Run a short functional check of battery units and signs regularly, and a longer discharge test on a calendar. Confirm the intervals your building must follow with your engineer, since requirements can depend on the system and occupancy.
- Walk the egress paths. Look for blocked corridors, stored boxes, covered signs and burned-out lamps. Obstruction of egress is an FDNY concern in its own right.
- Replace on evidence. If a unit fails a discharge test, replace the battery or fixture and log it. Do not wait for the next inspection.
- Re-verify after changes. New partitions, ceilings or tenant layouts can shadow a fixture or hide a sign.
Existing buildings are not automatically exempt
A common belief is that a building that predates the current code can leave its emergency lighting alone. Some provisions do allow lawful existing uses to continue. But the DOB and FDNY can require compliance for specific fire safety systems, especially in places of assembly, during alterations and after a change in use.
Typical triggers:
- A tenant fit-out that changes the occupancy or egress layout
- A change of use, for example office space becoming assembly or educational space
- A corridor or stair modification that moves or hides existing fixtures and signs
- A violation or inspection finding that points to a deficient system
Before assuming your system is acceptable, have a professional engineer do a compliance audit. It costs far less than discovering during a permit review that the whole floor needs new lighting and a new emergency source.
OSHA also applies to workplaces
If employees work in the building, federal rules apply alongside the city code. OSHA 29 CFR 1910.37 requires exit routes to be adequately lighted so an employee with normal vision can see along the route, and exit routes must be clearly marked and visible. OSHA does not set a footcandle number in every case, so in New York City the practical benchmark is the stricter, quantified Building Code requirement. Meet the city's numbers and you are well placed on the federal standard too.
A step-by-step approach for a retrofit or new design
- Establish the baseline. Identify the occupancy group, the code edition that applies to your project, and the egress paths that need illumination.
- Survey what exists. Count fixtures and signs, note their type and age, find the power source and check battery condition.
- Measure or model. Run a photometric calculation for the egress path. Check average, minimum, end-of-duration values and the 40 to 1 ratio.
- Check the emergency source. Confirm that the generator or battery system carries all required emergency loads for the full duration.
- Select compliant products. Confirm UL 924 listing and red lettering on internally lit exit signs, and the 25 footcandle face intensity on externally lit ones.
- Document and certify. Fold the work into the electrical permit and obtain the engineer's or architect's letter where needed.
- Set up maintenance. Start the test logbook on day one so FDNY has records from the first inspection.
Our perspective
We see emergency lighting problems less often as a product problem and more as a coordination problem. The fixture is rarely the issue. The issue is that the lighting layout was done in one place, the emergency power in another, and the maintenance records nowhere.
Because we handle mechanical, electrical, plumbing and fire protection design in-house, we can look at the egress path, the emergency source, the fire alarm interface and the permit path together. We work with the NYC Department of Buildings and FDNY regularly, and we think owners are best served by raising these questions before a filing, not after a rejection.
Our advice is simple. Treat the 1 footcandle average as the starting point, not the finish line. Check the minimum and the ratio. Give your test logbook the same attention as your drawings. And when a building has changed use or layout over the years, audit it rather than trusting the last approved plan.
— Joseph
Getting engineering support
If you own or manage a building in New York City and are unsure whether your emergency lighting, exit signs and emergency power would hold up under review, we can help. Bazini Engineering, P.C. prepares MEP and fire protection designs, evaluates existing building systems and supports NYC permit filing with the DOB and FDNY. Building owners and property managers can see how we approach evaluations and upgrades on our building owners page, or browse the full list of engineering services.
FAQ
How long must emergency lighting last in NYC?
At least 90 minutes after a power failure. At the start it must average 1 footcandle along the egress path, and by the end of the 90 minutes it may decline to a 0.6 footcandle average, with no point under 0.06 footcandle.
What are the NYC exit sign requirements?
Exit signs must be illuminated at all times and connected to emergency power for at least 90 minutes. Internally lit electric signs must be UL 924 listed with red letters. Externally lit signs need a face intensity of at least 25 footcandles.
Do I need a separate DOB permit for emergency lighting?
Generally no. Emergency lighting compliance is usually handled within the electrical permit. The electrical contractor certifies compliance, or a professional engineer or registered architect provides a sealed letter confirming it so the certificate of electrical inspection can be issued.
Who inspects emergency lighting after the building opens?
The FDNY is responsible for maintenance of emergency lighting and exit signs in existing buildings, along with keeping egress paths clear. Inspectors commonly look for working signs, visible emergency lighting and test records, so keep a current logbook.
Does an older building have to meet the current code?
Not automatically, since some lawful existing conditions may continue. But alterations, a change of use or an assembly occupancy can require compliance. Have a licensed engineer audit the building before you assume your current system is acceptable.
Sources
Per the owner's linking policy, these references are listed by name only, and you can find each in the public record:
- NYC Building Code, Section BC 1008: Means of Egress Illumination, including 1008.3 Emergency power for illumination
- NYC Building Code, Section BC 1013: Exit Signs, including 1013.6.2 Exit sign illumination
- NYC Department of Buildings, Chapter 27 Electrical materials
- NYC Department of Buildings, Buildings Bulletin 2023-011
- FDNY, Document and Applicant Requirements for Inspections / Building System Tests
- OSHA, 29 CFR 1910.37, Maintenance, safeguards, and operational features for exit routes
- UpCodes summary, Equipment requiring emergency power system