What Is Local Law 152?

Local Law 152: The Definition

Local Law 152 (LL152) is a NYC law that requires periodic inspections of exposed gas piping in most buildings with gas service. Enacted in 2016 after a series of deadly gas explosions, LL152 requires a Licensed Master Plumber (LMP) to inspect gas piping every four years and certify the condition to DOB.

Inspections are staggered by community district. Every building has a specific compliance deadline that falls within its four-year window — miss it and civil penalties accrue. LL152 is enforced by the Department of Buildings and violations flow through ECB summonses.

Need help scheduling and filing a LL152 inspection? Our DOB filings service handles LL152 inspection filings alongside the underlying LMP work.

Which Buildings Are Covered?

LL152 applies to nearly all buildings with gas service except:

• One-family homes and two-family homes occupied by the owner
• Buildings classified as R-3 (small residential) that meet specific criteria
• Buildings with no gas piping (fully electric or no gas service)

Everything else — multi-family residential, commercial, mixed-use — is subject to LL152 inspection on the community district cycle.

The Four-Year Inspection Cycle

LL152 inspections roll through the city on a four-year cycle by community district. To find your specific deadline, look up your community district and reference the cycle table on DOB's website — but the four cycle groups are:

What the LMP Inspection Covers

The inspection must be performed by a Licensed Master Plumber (LMP) or a qualified individual under their direct supervision. The LMP checks all exposed gas piping in public spaces (basements, mechanical rooms, hallways) for:

• Corrosion, leaks, and physical damage — Visual inspection and gas leak detection with electronic instruments.
• Improper supports or connections — Fittings, joints, hangers, and clearances.
• Unlicensed alterations — Signs of DIY plumbing work or missing permits.
• Illegal connections — Bypasses, meter tampering, or unpermitted branches.
• Ventilation compliance — Combustion air, exhaust vents, and space clearances around gas appliances.

After each inspection, the LMP files a Gas Piping System Periodic Inspection Certification (GPS1) with DOB. Depending on the findings, additional filings may be required:

• GPS1 — Standard certification when the system is compliant. Filed within 60 days of inspection.
• GPS2 — Correction certification if defects were found and repaired. Filed after remediation.
• Extension request — Owners can request up to a 180-day extension if extenuating circumstances prevent timely inspection.

LL152 is one of several NYC building compliance programs on a rolling inspection cycle — including Local Law 11/FISP (façade inspections), LL84 (energy benchmarking), and LL97 (carbon emissions). Owners of large buildings should track all four in a single compliance calendar.