Local Law 157 — Natural Gas Alarm and Carbon Monoxide Detector Requirements

Who is covered

Residential and mixed-use buildings with gas service and occupancy groups R-1 or R-2 (multiple dwelling buildings, hotels, dormitories).

What the law requires

• Install natural gas (combustible gas) detectors in each dwelling unit and in common areas near gas appliances.
• Maintain all detectors in working condition and replace them according to manufacturer specifications.
• File an annual certification with DOB confirming detectors are installed and operational.

Filing frequency and deadlines

Penalty structure

Non-compliance with LL157 can result in the following penalties:

• $250 to $1,000 per unit for failure to install or maintain detectors.
• Penalties multiply quickly in large residential buildings.

Exemptions

• Buildings without gas service.
• R-3 occupancies (one- and two-family dwellings) are not covered.

Recent updates and amendments

DOB and FDNY have issued guidance clarifying which detector models meet the law's requirements. Enforcement is typically complaint-driven but is increasingly checked during routine inspections.

Reference

Official source: NYC DOB — Gas Alarms