LL152 Gas Inspection: Deadlines, GPS1/GPS2 Reports, and Penalties

New York City’s Local Law 152 requires most buildings with gas service to have their exposed gas piping inspected by a Licensed Master Plumber every four years and to file a signed certification with the Department of Buildings. The LL152 gas inspection requirements apply to nearly every building in the city except one- and two-family homes, and missing your filing deadline carries a civil penalty of up to $5,000.¹

Which Buildings Are Covered

Every building in New York City with gas piping is covered unless it falls into Occupancy Group R-3, which covers one- and two-family homes.² Apartment buildings, offices, retail, warehouses, mixed-use properties, and structures used only for metering and regulating gas are all in.³

Buildings with no gas service at all still have a filing to make. A registered design professional or a Licensed Master Plumber signs and seals a Gas Piping System Periodic Inspection Certification stating that the building contains no gas piping. Once that no-gas certification is on file, nothing more is required until conditions change. If you are unsure whether your building qualifies for the R-3 exemption, check your Certificate of Occupancy or contact DOB before assuming you are out of scope.

Your Deadline by Community District

Filing deadlines are staggered across four sub-cycles so the entire city is not inspecting at once. Each sub-cycle covers a group of Community Districts, and the cycle repeats every four years. The Community District numbers apply across all five boroughs, so a District 10 building in Manhattan shares a sub-cycle with a District 10 building in Brooklyn.

Sub-cycle A — Districts 1, 3, 10: last deadline December 31, 2024; next December 31, 2028.
Sub-cycle B — Districts 2, 5, 7, 13, 18: December 31, 2025; next December 31, 2029.
Sub-cycle C — Districts 4, 6, 8, 9, 16: December 31, 2026; next December 31, 2030.
Sub-cycle D — Districts 11, 12, 14, 15, 17: December 31, 2027; next December 31, 2031.²

If you cannot complete the inspection before your deadline, the DOB’s online portal allows a one-time 180-day extension. The inspection still has to be done inside that extended window.² Plumbers book up heavily in the months leading into a December 31 deadline, so lining up the work early matters.

Who Performs the Inspection and What They Check

A Licensed Master Plumber, or a qualified technician working under their direct and continuing supervision, must perform the inspection.⁴ No other trade is authorized to do this work.

The scope covers exposed gas piping from the point of entry through common areas, hallways, corridors, mechanical rooms, boiler rooms, and rooftops. Piping inside individual tenant spaces is not inspected. “Exposed” means open to view, so lines hidden above a drop ceiling or behind an access door do not count, and buried piping is excluded as well.³

During the walk-through, the plumber checks for:

Atmospheric corrosion on exposed piping; corrosion levels 3 and 4 must be reported to DOB.
Gas leaks, surveyed with a combustible gas detector along the entire path of exposed piping and in all public spaces on floors that contain gas piping or gas equipment.
Illegal connections, including theft of service, cross connections, and substandard materials.
Installations that do not meet 2014 NYC Construction Code requirements.
Pressure regulators, regulator vents, valves, sleeves, and point-of-entry seals.

The leak survey is often the part owners underestimate. It is not a visual inspection; the plumber is sweeping a detector through hallways and mechanical spaces, which takes real time in a larger building.

The GPS1 Report and the GPS2 Certification

Two documents come out of every inspection, and they do different jobs.

The GPS1 is the Gas Piping System Periodic Inspection Report. It is the detailed findings document, and the Licensed Master Plumber must deliver it to you within 30 days of the inspection.² You keep the GPS1 in your records; it is not submitted to DOB.

The GPS2 is the Gas Piping System Periodic Inspection Certification, signed and sealed by the Licensed Master Plumber who conducted or supervised the inspection. It summarizes whether conditions were found and whether any immediate hazards exist.⁵ You file the GPS2 through DOB NOW: Safety within 60 days of the inspection.²

The 60-day clock runs from the inspection date, not from when the plumber hands you the paperwork.⁶ If your plumber uses the full 30 days to deliver the GPS1, you have only 30 left to file the GPS2. Press for faster turnaround, and before filing confirm that the address, BIN, and the statement about hazardous conditions are correct. The original DOB service notice stated no filing fee would be charged for the inspection certification itself, but the rules reference fees for correction certifications, so check the portal for current fees when you file.⁴

If the Inspection Finds Problems

For conditions that are not immediately hazardous, you have 120 days from the inspection due date to submit a certification from a Licensed Master Plumber confirming the corrections are complete. That certification can note that specific repairs will take longer.⁶ The hard backstop is 180 days from the inspection due date. By then, a final certification from a Licensed Master Plumber must confirm that every condition in the report has been corrected.⁷ There is no further extension.

Corroded piping, outdated regulators, and non-compliant connections all require permitted work by a licensed plumber, and repair costs often exceed the inspection fee by a wide margin. If your building has not had serious plumbing attention in decades, budget for the possibility.

Hazardous Conditions

If the plumber finds an unsafe condition during the inspection, the timeline compresses. The plumber must immediately notify you, the gas utility, and the Department of Buildings, and should call 911 for anything imminently dangerous such as an active leak. The utility will typically shut off gas service to the affected area or the whole building. You must correct the hazardous conditions in compliance with the NYC Construction Codes, including obtaining any required work permits, and service will not be restored until repairs are completed, inspected, and approved.²

Penalties for Missing the Deadline

The civil penalty for failing to file the required inspection certification by your deadline is $1,500 for three-family buildings and $5,000 for all other covered buildings.¹⁸ Penalties apply per cycle, so missing deadline after deadline stacks up.

An unresolved LL152 violation also surfaces in DOB records that buyers, lenders, and insurers routinely pull during sales, refinancings, and renewals. The fine itself is often the smallest part of the problem.

Records to Keep

Keep records of all periodic inspections, including the GPS1 report, for at least ten years, and make them available to DOB on request.⁷ Because the inspection cycle repeats every four years, that covers at least two full cycles at any given moment. Store the GPS1, a copy of the filed GPS2, any correction certifications, and receipts from repair work together. These documents come up during property transactions, insurance claims, and DOB audits.

1
NYC Rules. Penalty for Failure to File Certification of Gas Piping Inspection
2
NYC Department of Buildings. Gas Piping Inspection
3
NYC Department of Buildings. Frequently Asked Questions – Local Law 152 of 2016
4
NYC Buildings. Local Law 152 of 2016 Periodic Inspection of Gas Piping Systems Required
5
NYC Department of Buildings. Gas Piping System Periodic Inspection Certification
6
New York City Codification. NYC Administrative Code 28-318.3.3 – Report and Certificate of Inspection
7
New York City Codification. 1 RCNY 103-10 – Periodic Inspection of Gas Piping Systems
8
NYC Department of Buildings. 1 RCNY 103-10 – Periodic Inspection of Gas Piping Systems