Local Law 97 (LL97) is New York City’s law limiting carbon emissions from large buildings, and it has moved from a future concern to an active financial reality. The first compliance reports, covering 2024 emissions, were filed in 2025, the second round covering 2025 emissions was due by May 1, 2026, and buildings exceeding their emissions cap now face a real, recurring penalty of $268 per metric ton of carbon dioxide equivalent (CO2e) over the limit, every year they remain over it.
Key facts
- LL97 applies to buildings over 25,000 square feet in New York City, part of the city’s Climate Mobilization Act passed in 2019.
- Buildings that exceed their emissions cap face a penalty of $268 per metric ton of CO2e over the limit, charged annually for as long as the building stays over its cap.
- The first compliance reports, covering 2024 emissions, were due May 1, 2025, filed through the city’s BEAM portal with certification from a registered design professional.
- The second compliance reports, covering 2025 emissions, were due May 1, 2026, with a grace period through June 30, 2026 before late filing penalties apply.
- Roughly 93% of covered private buildings filed their required reports citywide, with Manhattan reaching around 95%.
- A Good Faith Effort (GFE) framework offered penalty relief during the first compliance period for buildings showing credible progress, but that relief is winding down as enforcement matures through 2026.
- Emissions caps tighten again in 2030, and further in 2035 and 2040, on a path toward near-zero emissions by 2050. Urban Green Council estimates that around 63% of covered buildings are on track to exceed the stricter 2030 to 2034 limits.
Which buildings does Local Law 97 apply to?
LL97 applies to most buildings over 25,000 square feet in New York City, covering commercial, residential, and institutional properties alike. A handful of carve-outs exist, rent-stabilised buildings with 35% or more rent-stabilised units have deferred or adjusted limits, houses of worship are exempt from penalties though not from reporting, and NYCHA and other city-owned buildings sit on a separate compliance pathway.
Because the law covers such a broad range of building types, LL97 has become one of the largest single drivers of building emissions data in the city, nearly 50,000 buildings fall within its scope.
How much is the Local Law 97 penalty for exceeding an emissions cap?
The penalty is $268 per metric ton of CO2e a building emits above its assigned cap, charged every year the building remains over that limit. There’s no cap on how long this can accrue, it’s a recurring annual cost rather than a one-time fine, which is why it’s increasingly factored into how buildings are valued, financed, and sold.
Separate penalties apply for late or inaccurate filing. Late submissions can carry a charge of up to $0.50 per square foot per month, and knowingly false statements in a compliance report can carry penalties of up to $500,000.
What are the Local Law 97 compliance deadlines?
The first compliance period runs from 2024 to 2029, with annual reports due each May 1 covering the previous calendar year’s emissions. The report covering 2024 emissions was due May 1, 2025, and the report covering 2025 emissions was due May 1, 2026, with a grace period through June 30, 2026 before late filing penalties are assessed.
Emissions caps then tighten for the second compliance period beginning in 2030, and tighten again in 2035 and 2040, with the city’s ultimate target being near-zero building emissions by 2050.
Has Local Law 97 enforcement actually started?
Yes. The first two annual reporting cycles are now complete, and the New York City Department of Buildings has moved from planning guidance into active penalty assessment. Roughly 93% of covered private buildings filed their required 2024 emissions reports, and enforcement data now shows a meaningful share of buildings already over their cap and accruing penalties.
This is the biggest shift since LL97 was first introduced. What was once a compliance planning exercise is now a recurring, measurable financial line item for any building that hasn’t reduced its emissions in line with its assigned cap.
Local Law 97, 2026 Filing Year Deadlines
Key Local Law 97 (LL97) dates for the 2026 filing year, covering the standard reporting period and the extension period.
New York City buildings are also subject to separate deadlines under Local Law 84, Local Law 87, Local Law 88, and Local Law 33 throughout the year. This diagram covers Local Law 97 only.
Source: NYC Department of Buildings, Local Law 97 guidance
What is the Good Faith Effort framework, and is it still available?
The Good Faith Effort (GFE) framework allowed building owners to avoid or reduce penalties during the first compliance period by demonstrating credible progress toward compliance, such as a documented retrofit plan, even if the building hadn’t yet hit its emissions target. It gave owners meaningful flexibility through 2024 and 2025 while broader compliance infrastructure and reporting processes were still maturing.
That flexibility is narrowing as enforcement becomes routine. Owners who haven’t already moved from planning to action are running out of room to rely on Good Faith Effort provisions as a substitute for actual emissions reduction.
How are Local Law 97 emissions limits calculated?
A building’s emissions cap is calculated based on its occupancy type and total floor area, with different occupancy groups (residential, office, retail, healthcare, and others) assigned different allowable emissions intensities. The formula accounts for the fuel type used, since natural gas, electricity, and steam each carry different emissions factors, and electricity specifically is weighted against New York City’s average grid emissions intensity.
Because the calculation depends entirely on accurate energy consumption data across a building’s systems, the quality of a building’s underlying metering and monitoring has a direct effect on how confidently it can report, and defend, its compliance position.
How can building analytics help with Local Law 97 compliance?
Building analytics platforms support LL97 compliance by continuously tracking energy consumption and emissions across a building’s HVAC, lighting, and metering systems, rather than relying on a single annual snapshot pulled together at reporting time. This gives building owners and managers ongoing visibility into where they sit against their emissions cap, well before the May 1 filing deadline forces the question.
Fault detection and diagnostics adds a further layer, catching the inefficiencies, an overworked air handling unit, a miscalibrated damper, that quietly push a building’s emissions upward, long before they show up as an unwelcome surprise in an annual report. For a broader look at how continuous monitoring supports building performance beyond emissions compliance alone, see Bueno’s Building Management System explainer and Energy Data Management guide.
Useful links
- NYC Department of Buildings, Local Law 97 guidance, the official source for compliance requirements, deadlines, and rule updates.
- NYC BEAM portal, the city’s official system for filing Local Law 97 emissions reports.
- ENERGY STAR Portfolio Manager, the federal benchmarking tool widely used alongside Local Law 97 reporting to track building energy and emissions data over time.
Talk to Bueno about Local Law 97 compliance
Want to know more? Contact Bueno for a demonstration of how continuous building analytics supports Local Law 97 compliance, energy performance, and long-term emissions reduction.
