For NYC landlords · Gas, smoke and CO detectors
Every detector, in every unit, with the date it runs out.
A natural gas detector in each unit with gas by January 1, 2027. Smoke and CO alarms replaced when the manufacturer’s useful life ends. The notice posted downstairs. One list per building, the dates on it, and a reminder before each one.
- One record per device, per unit
- Reminders before Jan 1, 2027 and each useful-life date
- 14 days free, no card
- 2ANatural gas detectorInstalled May 1, 2026 · replace by May 2036Done
- 3BNatural gas detectorNone on file · install by Jan 1, 2027Due
- 4CSmoke alarmUseful life ended Sep 30 · replaceLate
- 5ACO alarmInstalled Mar 10, 2025 · replace by Mar 2032Done
- BldgDetector notice postedPosted Feb 1, 2026 · photo attachedDone
Sample data. Not real records.
Why the records matter
Four agencies can ask for the same list.
The rules name the records: the day the notice went up, each device’s useful-life date, the installation date per unit. HPD, DOB, FDNY and the Health Department can each ask for them.
The deadline for a natural gas detector in every unit with gas, moved from May 1, 2025 by Local Law 102 of 2025. DOB says it will not move again.
Local Law 102 of 2025; DOB service notice, June 15, 2026To replace a device the tenant reports as defective in writing. A missing or inoperable one is replaced before a new tenant moves in.
28 RCNY §12-09.1The tenant’s reimbursement for each device you provide and install: $25 per device, $50 for a dual device, $75 for a triple, with a year to pay. Tenants keep the devices working and replace one they removed.
NYC Admin Code §27-2045(c)–(e)What the law asks
The detector records the city expects per unit.
Every class A and B multiple dwelling (three or more units), and every 1–2 family home rented to someone outside the owner’s family. Each device is a record under its unit, with the date it went in and the date the manufacturer says it runs out.
Last verified Oct 13, 2026
- 01A natural gas detector by January 1, 2027In every unit with gas piping or service: the same room as each gas appliance, 3–10 ft away, on the ceiling or within 12 inches of it; units above gas equipment too. Listed to UL 1484 or UL 2075 (NFPA 715). Hard-wired ones by a licensed electrician; battery or plug-in by anyone.
- 02Smoke alarms in every unitIn each unit of a multiple dwelling, within 15 ft of the entrance to each sleeping room. Replaced when the manufacturer’s useful life is exceeded. Record each one with its useful-life date.
- 03CO alarms in every unitMultiple dwellings and private dwellings alike: listed to UL 2034 with an end-of-life signal, replaced when it sounds or the useful life expires. One record per device, with the date.
- 04ReplacementsAt the end of each device’s useful life; before a new occupancy when one is missing or inoperable; within 30 days of a tenant’s written notice that one is defective.
- 05The posted noticeA permanent notice in a common area (metal, plastic or a decal, letters 3/16 inch), or a digital one since February 1, 2026. A combined smoke, CO and gas form exists. Record the day it went up; attach a photo.
- 06Information to the occupantAn adult occupant is told about each device when it is installed. Keep a note of it with the device.
- 07Records for four agenciesThe notice date, each device’s useful-life date and the installation date per unit, available to HPD, DOB, FDNY and DOHMH when they ask.
Your year
No yearly date; the devices set the calendar.
- Jan 1, 2027Gas detectors inEvery unit with gas has a listed natural gas detector, recorded with its useful-life date.
- Every new occupancyCheck the devicesA missing or inoperable detector is replaced before the new tenant moves in.
- 30 daysAfter a written noticeA device the tenant reports as defective is replaced within 30 days.
- Each useful-life dateReplace the deviceSmoke, CO and gas alike: the manufacturer’s date on the device. You hear from us 60 days before.
How it works
Every unit, every deadline, every report. One file.
- 01
Add your buildings
Address, year built and every unit. Type them in or import a CSV from your spreadsheet.
- 02
See what each unit owes
The app works out what every unit needs under your city’s law, and when. You get a reminder before each deadline.
- 03
Log it on your phone
Notices, tenant replies, visits, clearances and certificates, each with its date and the report or photo.
- 04
Hand over one file
When HPD asks, download every record for a building as one PDF, in the order HPD asks for them.
Pricing
14 days free. Then a plan by your units.
No card to start. Four plans by the number of units you track; pay yearly and two months are free. Common areas and buildings you have sold are not counted. Unlimited people, records and photos on every plan.
Starter
Up to 10 units
$9/ month
or $90 a year
A house with a rented unit, a two- or three-family, a small building.
Building
Up to 40 units
$39/ month
or $390 a year
A few buildings, or one larger one.
Portfolio
Up to 120 units
$99/ month
or $990 a year
A portfolio across the city.
Manager
Up to 500 units
$349/ month
or $3490 a year
A management company.
Over 500 units: from $0.40 a unit a month, at least $349 a month, billed yearly on an invoice. Email hello@violationproof.com.
FAQ
Straight answers.
Something else? Email hello@violationproof.com
Pre-1960 building? See Local Law 1 lead recordsDo I have to send tenants a smoke or CO notice every year?
No. The rules ask for a permanent notice posted in a common area (or shown digitally), and for information to an adult occupant when a device goes in. No primary source puts a smoke or CO notice in the January annual notice or requires one each year.
Which buildings need the natural gas detector?
Class A and B multiple dwellings and 1–2 family homes not lived in by the owner, where there is gas piping or service. A building with no gas has no gas detector duty; tell the app once on the building form and the duty goes away.
How long does a smoke or CO alarm last?
As long as the manufacturer says. Smoke alarms are replaced when the useful life printed on them is exceeded; CO alarms carry an end-of-life signal and are replaced when it sounds or the date passes. Each device has its own date, so each one is its own record here.
Does ViolationProof install or inspect the detectors?
No. Your electrician, super or you install them. ViolationProof keeps the list: which device is in which unit, when it went in, when it runs out, and the day the notice was posted, so you can produce it when HPD, DOB, FDNY or the Health Department asks.
Start
Every unit’s devices, on file today.
Add your buildings and units, record the detectors already in place with their useful-life dates, and see which units still need a gas detector before January 1, 2027. 14 days free, no card; then from $9 a month.
Start free- 14 days free, no card
- Sign in with a code from your email, no password
- Your records stay yours: download the file any time, even on the free Archive plan
Units somewhere we don’t cover yet, or a question about your city’s law? Tell us where you are, and we write back.
Sources
- NYC Administrative Code §27-2045 (smoke, carbon monoxide and natural gas detecting devices)
- NYC Administrative Code §28-312.3 (carbon monoxide alarms)
- NYC Administrative Code §28-312.4 (smoke alarms)
- 1 RCNY 908-02 (natural gas detectors)
- 28 RCNY §12-01 (smoke and carbon monoxide detecting devices)
- 28 RCNY §12-09.1 (natural gas detecting devices)
- Local Law 102 of 2025 (the January 1, 2027 deadline)
- DOB service notice on natural gas alarms, June 15, 2026
- DOB: natural gas detector FAQ
- HPD: smoke, carbon monoxide and natural gas detectors
- HPD smoke detector posting notice (sample)
This page summarizes NYC Administrative Code §27-2045 and Article 312 (smoke, carbon monoxide and natural gas detectors) for owners. It is not legal advice. ViolationProof is not affiliated with NYC HPD and DOB or the U.S. EPA.