Understanding Compliance Options for Residential Buildings with a TCO After January 2025

Buildings that received a Temporary Certificate of Occupancy (TCO) before January 1st, 2025 can install any UL-listed and labeled gas detector to comply with Local Law 157. However, buildings receiving their TCO after January 1, 2025, must install either a hardwired UL-listed and labeled gas detector or a Smart, battery-powered gas detector that is part of a monitored system.  

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Smart Monitored Gas Detector – The Cost-Effective Option

• 10-Year Battery Operated
• Powered by a LoRaWAN network—no WiFi or hardwiring needed.
• A monitored system that alerts building management within seconds of a gas leak with the precise location and severity of the leak.

110V Hardwired Gas Detector – The Costly Option

• Requires a wired power source, installed by a licensed electrician, resulting in higher installation costs.
• Line voltage devices require a battery backup to maintain operation during power outages, with batteries typically needing replacement every 6 months.
• There is no monitoring capability, nor notification to building staff.

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For most buildings, the battery-powered smart detector offers a more affordable and efficient path to compliance, avoiding complex electrical work while enhancing safety with real-time monitoring.

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Stay Ahead of Local Law 157 Compliance

With the January 1, 2027* deadline approaching, ensuring compliance with Local Law 157 is crucial for new developments and existing buildings. Choosing the right gas detection system, whether the cost-effective Smart Gas Detector or the hardwired option, can help streamline the process and enhance building safety. 

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To prepare, check out our Local Law 157 Compliance Checklist and ensure your property meets the latest requirements.

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*Enforcement of Local Law 157 has been delayed until January 1, 2027, per legislation recently passed by the NYC Council Int. 1281-2025.

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