No U.S. city regulates building energy as aggressively as New York. If you own or design a building over 25,000 square feet in NYC, you are subject to a stack of overlapping local laws — and one of them, Local Law 97, carries annual financial penalties for buildings that emit too much carbon. This guide pulls the whole picture together: what each law requires, how they connect, and where energy modeling is the tool that keeps you compliant.
The NYC energy law stack at a glance
Four "Local Laws" plus the NYC Energy Conservation Code do most of the work. They were designed to reinforce one another — benchmarking measures performance, audits find savings, and Local Law 97 caps the carbon:
| Law | Applies to | What it requires |
|---|---|---|
| LL84 | > 25,000 sf | Annual energy & water benchmarking in ENERGY STAR Portfolio Manager (due May 1). |
| LL87 | > 50,000 sf | Energy audit + retro-commissioning every 10 years (Energy Efficiency Report). |
| LL88 | > 25,000 sf | Lighting upgrades + tenant sub-metering. |
| LL33/95 | > 25,000 sf | Public A–D energy efficiency grade posted at the entrance. |
| LL97 | > 25,000 sf | Annual carbon-emissions limits, with penalties for exceeding them. |
| Energy Code | New work / alterations | NYCECC requirements at permit/filing for new buildings and renovations. |
Local Law 97: the one with penalties
Local Law 97 is the centrepiece. Most buildings over 25,000 sf must stay under an annual greenhouse-gas emissions limit, with the first compliance period running 2024–2029 and far stricter limits arriving in 2030. Buildings that exceed their limit pay $268 per metric ton of CO₂e over the cap, every year. Emissions reports are filed annually (the first covered calendar-year 2024). Because the 2030 limits are much tighter, many buildings that comply today will not in a few years — which is exactly why planning ahead matters. We go deeper in how energy modeling helps reduce LL97 carbon penalties.
The NYC Energy Code for new work
Separately, any new construction or significant alteration must meet the NYC Energy Conservation Code at filing. The latest 2025 edition tightens envelope, HVAC and lighting requirements and pushes toward electrification — and it ties directly into the LL97 trajectory. See NYC energy compliance in 2026: the new 2025 Energy Code & Local Law 97 for what is changing and when.
Where energy modeling fits
Energy modeling is the connective tissue across all of these requirements. A whole-building energy model lets you:
- Project LL97 emissions for current and future compliance periods, and test retrofit measures (electrification & heat pumps, envelope, controls) before committing capital.
- Demonstrate NYC Energy Code compliance for new buildings and alterations via the performance path.
- Prioritise the savings that LL87 audits surface, by quantifying their carbon and cost impact.
- Turn benchmarking data into a forward-looking decarbonization plan, not just a backward-looking score.
A crucial detail many owners miss: LL97 counts total building emissions — including the energy the code does not directly regulate. That makes the distinction between regulated and unregulated loads, and the size of your plug & process loads, central to an accurate NYC carbon projection.
What NYC owners and teams should do
Know which laws apply to your square footage, keep benchmarking current, and — most importantly — model your LL97 emissions against both the 2024 and 2030 limits now, while you still have time to plan capital upgrades. The buildings that get ahead of the 2030 cliff will avoid years of escalating penalties; the ones that wait will pay for it.
Need NYC energy compliance modeling?
We model NYC buildings for Local Law 97 emissions, the NYC Energy Code and retrofit planning — quantifying your penalty exposure and the most cost-effective way to cut it. Talk to us about your building.
Get in touchThis article is general guidance and reflects information available at the time of writing. NYC requirements, limits and penalties are set by the City of New York and may change — always confirm current rules with the NYC Department of Buildings for your specific building.