New York Local Law 87 is legislation that forms part of the existing energy laws, is monitored for compliance by the Department of Building (DOB). LL87 mandates buildings over 50,000 gross square feet undergo periodic energy audit and retro-commissioning measures, as part of the Greener, Greater Buildings Plan (GGBP). The intent of this law is to inform building owners of their energy consumption through energy audits, which is a comprehensive building wide inspection of energy use, and retro-commissioning, the process of ensuring correct equipment installation and performance.


3.8.1. Scheduling

The date of the audit report to be filed must reflect an initial inspection date no more than 18 months prior to the filing deadline.  

An individual performing or supervising work necessary to conduct the energy audit and retro-commissioning must be: 

  • a registered architect or licensed professional engineer in New York State with appropriate audit or retro-commissioning qualifications, or 
  • a DOB registered energy auditor or retro-commissioning agent with approved training 

3.8.2. Inspection

Performed by a licensed engineer a physical plant & mechanical inspection of all assets throughout the building is performed. A detailed report is provided with photographs outlining the conditions found during the inspection. If deficiency items are outlined, recommendations on how to be compliant are also highlighted.  

3.8.3. Retro-Commissioning

Retro-commissioning is the process of ensuring that the energy systems in an existing building are installed as per the design intentions, functionally tested, and capable of being operated and maintained, according to the owner’s operational needs. 

3.8.4. Filing

Energy Audits and Retro-commissioning Compliance Deadlines 
starting in 2013, for covered buildings will be due in the calendar year with a final digit that is the same as the last digit of the building’s tax block number, as illustrated in the chart below. The report must be filed on the buildings Audit Year by December 31st 

The building’s energy audit and retro-commissioning work must be completed prior to filing the EER. Note, the report can’t be filed with deficiencies noted, the Department of Building will reject the filed report. 

Year first EER is due 






Last digit of tax block number