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Local Law 157 in New York City Explained- NYC

This legislation groups together natural gas detection devices alongside requirements for smoke and carbon monoxide detectors, including the necessity for posting or providing notices. Specifically, the law mandates that owners take certain actions if natural gas detectors are deemed necessary. Below is a brief description, but the full law can be found here: ll157of2016.pdf (

Owners are obligated to furnish information to at least one adult occupant of a dwelling regarding:

(i) the dangers of carbon monoxide poisoning and, if natural gas detection devices are required by building commissioner regulations, the risks associated with natural gas leaks, (ii) the testing and upkeep of smoke detectors, carbon monoxide detectors, and, if mandated, natural gas detection devices

(iii) appropriate responses when these devices sound alarms

(iv) the lifespan of such devices

(v) the owner’s responsibility to replace them as per regulations, and

(vi) the occupant’s duty to maintain and replace battery-operated devices within their dwelling unit as needed.

This information may include materials provided by manufacturers or approved by the department of buildings (DOB). However, these requirements do not apply to certain types of dwellings or smoke detectors in private homes.

The residential obligations for smoke and carbon monoxide detectors are generally outlined by HPD, with updates expected to include natural gas detectors. Any relevant notices or sample materials will be provided by the department when available.

Regarding the final ruling:


  • Natural gas alarms are required in private dwellings, class A multiple dwellings, and class B multiple dwellings.

  • Exemptions apply to buildings without gas piping or service.


  • Private dwellings and class A multiple dwellings must install one or more natural gas alarms by May 1, 2025.

  • In class B multiple dwellings, options include installing alarms in each dwelling or implementing a zoned natural gas detection system in public areas.


  • Alarms must adhere to NFPA 715 standards and be installed appropriately, considering proximity to fuel-gas appliances and labeling requirements.

  • The devices must be listed and labeled with applicable UL standards and must be maintained in working order.

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