NYC Building Energy Laws: A Compliance Guide for Owners

Which Laws Apply to Your Building?

Size decides most of it. The threshold is 25,000 gross square feet for LL84, LL97, LL33/95, and LL88, and 50,000 gross square feet for LL87, measured from Department of Finance records rather than your own drawings.

Buildings that share a tax lot are added together, and the laws do not add them the same way. LL97 covers every building on a lot once the combined total passes 50,000 gross square feet. The others wait for 100,000. Three 20,000-square-foot buildings on one lot therefore fall under LL97 and none of the others, a combination owners rarely expect.

Check the list, not the rule of thumb. The Department of Buildings publishes a Sustainability Law Covered Buildings List each spring, and the 2026 edition covers LL84, LL87, LL88, and LL97 in one spreadsheet. Owners are also notified in the November property tax bill, and a building’s status can change from one year to the next.

Some properties are carved out. Tax Class 1 homes and certified garden-style apartments are excluded from LL84, while certain affordable housing and houses of worship comply with LL97 under Article 321 rather than against annual emissions limits.

What Is Due Every Year?

Three annual obligations share two dates. May 1 carries benchmarking and emissions reporting, both covering the previous calendar year, and October 31 carries the energy grade that the May benchmarking data produces.

What Comes Due Once Every 10 Years?

LL87 requires buildings over 50,000 gross square feet to complete an energy audit and retro-commissioning, then file the results as an Energy Efficiency Report, every 10 years. Your tax block sets the year. The report is due in the calendar year whose last digit matches the last digit of the block number, so buildings on blocks ending in 6 file by December 31, 2026.

Start early. The work has to be performed or supervised by a registered design professional who is not on the building’s staff, and some retro-commissioning tests can only run in heating or cooling season, so we plan for at least six months. A missed report is a Class 2 violation carrying $3,000 in the first year and $5,000 for each year after that.

Treat the audit as more than a filing. An LL87 audit is the most detailed look most buildings get at their systems in a decade, and it should double as the plan for LL97. Our Local Law 87 guide covers what to ask an auditor, and our energy audit engineers scope LL87 work against LL97 limits from the start.

Is Local Law 88 Still a Live Requirement?

Yes, for buildings that have not filed.

LL88 required covered buildings to bring lighting up to the NYCECC and to submeter large commercial tenant spaces by January 1, 2025. The Department still lists buildings that have not demonstrated compliance, and those owners report through BEAM on the same May 1 date as LL97.

The scope is narrower than it sounds. In multifamily properties the lighting rule reaches common areas only, and submeters are required for tenant spaces over 5,000 square feet. Lighting installed to code after July 1, 2010 generally complies already, though a registered design professional or licensed electrician still has to attest to it. Our Local Law 88 lighting and submetering overview has the rest.

What Applies When You Build or Reroof?

Three requirements are triggered by a permit application rather than a calendar date, and none of them depends on the 25,000-square-foot threshold.

Who Can Sign Each Filing?

Not the same person every time. An owner or an assigned representative can submit LL84 benchmarking, while LL97 reports must be certified by a registered design professional. LL87 audits need a professional engineer or registered architect from outside the building staff. For LL88, the attestation can come from a registered design professional or a licensed master or special electrician, and LL92/94 filings need a registered design professional plus an electrical filing for solar.

How Do the Laws Connect?

Through one record. LL84 data sets the grade and feeds the LL97 emissions calculation, and the LL87 audit finds the measures that move both. A meter dropped from the benchmarking submission lowers the grade, misstates emissions, and hands the auditor a false baseline.

One omission, three filings.

Timing matters as much as accuracy. Work identified in an LL87 audit lowers LL97 emissions and raises the ENERGY STAR score behind your grade, so a building that schedules its audit two or three years ahead of 2030 has time to fund the work through its capital plan instead of through penalties. That is the argument in our case for a capital strategy approach to LL97.

What Changes Next?

Some dates are fixed in law. LL97 limits tighten in 2030, and LL154 reaches all new buildings on July 2, 2027.

The mechanics move more often. Grace periods, extension windows, and filing portals are set by Department of Buildings rules and service notices, and they changed in both 2025 and 2026. The 2025 LL87 deadline, for one, was pushed to March 31, 2026. This page carries a review date, and we update it when the Department publishes new guidance.