• 347-726-5204
  • |
  • diligentmechanical@gmail.com


Diligent Mechanical Services INC

The Diligent Mechanical Services, a fourth-generation, privately owned and operated company since 1928, is New York’s preeminent provider of plumbing, heating & air conditioning, fire protection and green solution services. The company is dedicated to preserving and building its distinguished reputation for professionalism and reliability. Over the years the company has played a vital role in New York City’s construction industry. The company’s 4 divisions – Diligent Plumbing, Diligent Heating & Air Conditioning, Diligent Fire Protection and Diligent Green Solutions.


When Is My First Inspection Due Date?

Date Range for Inspection Date Range for Inspection
January 1, 2020 – June 30, 2021 1, 3 and 10 in all boroughs
January 1, 2021 – June 30, 2022 2, 5, 7, 13, and 18 in all boroughs
January 1, 2022 – December 31, 2022 4, 6, 8, 9, and 16 in all boroughs
January 1, 2023 – December 31, 2023 11, 12, 14, 15, and 17 in all boroughs
January 1, 2024 – December 31, 2024 1, 3 and 10 in all boroughs

To lookup your Community District, click here. After you have entered an address, click the Neighborhood Information link on the right panel. This will bring up the Community District.


What’s New @ The Diligent Mechanical Services

Local Law 152 Compliance Schedule

The year in which your initial LL 152 Gas Inspection or certification

Refrigerant Additives

PROA One type of additive is a polarized refrigerant oil additive (PROA),

New Rate Proposal for the Cost of Water in New York City

Even as the proposed water service rate increases, the revised figure would

Latest News

COVID Safety Measures and Specialty Services

Safety, Compliance, Maintenance and Repair Services The below is a general guide

New York City Local Law Compliance And Safety Program For Gas And Water Systems

New York City has multiple local laws that require periodic inspection and


Contact Diligent today to discuss the health and safety needs of your building.

  • 347-726-5204
  • diligentmechanical@gmail.com

Contact Us