It’s important to understand the timeline involved with inspection, submission of the report, and further steps. The breakdown for what building owners need to know regarding an LL 152 gas inspection is as follows: Have your inspection done on or before the due date. Within 30 days of the inspection, the licensed master plumber will provide you with a gas piping system periodic inspection report. This report details the findings of the inspection and any actions that must be taken on your part. Within 60 days of the Local Law 152 inspection, you must submit Local Law 152 forms to the NYC Department of Buildings. It must be signed and sealed by the licensed master plumber conducting the inspection. It does not cost anything to file (note that it does cost to have the inspection conducted). Within 120 days of the initial inspection, the owner must submit an LL 152 gas inspection certification signed and sealed by a licensed master plumber conducting the original inspection stating that any required corrections have been made (only applicable if corrections are needed). Extensions are available for corrections, but only up to 180 days from the inspection, and by that date, you must submit a signed and sealed certification stating that the corrections have been made. Note that all corrections must adhere to NYC construction codes. Keep all certifications and reports for 10 years.