Local Law 97 Calculator

How Local Law 97 penalties are calculated

The formula is on one line, and every penalty is calculated from it. Take your building's actual annual emissions, subtract the emissions limit assigned to your building, then multiply the remainder by $268.

(annual emissions - emissions limit) x $268 = annual penalty

Your emissions limit is not a single number you can look up (that would be too easy!). The New York City Department of Buildings (DOB) sets these emissions limits by occupancy group, so every square foot of residential space, retail, parking, and the rest carries its own carbon intensity cap. Your building's limit is the sum across all of that space. Your actual emissions come from converting each fuel you burn (utility electricity, natural gas, fuel oil, district steam) into carbon using DOB's coefficients. For the 2024 through 2029 period, utility electricity counts as 0.000288962 metric tons of CO2e per kWh and natural gas as 0.00005311 per kBtu.

The practical takeaway for a board: two buildings the same size can owe wildly different penalties depending on how they heat and power themselves. An all-electric building and one running an old oil boiler are not playing the same game.

You have two levers to pull the number downward. The first is energy efficiency: cut consumption across your energy sources to reduce emissions, and you shrink the building emissions that get multiplied by $268. The second is offsets, with limits. Buildings can deduct renewable energy credits (RECs) delivered to the grid against electricity emissions only, and total offsets are capped at 10 percent of your annual emissions limit. Onsite solar or battery storage for backup power can chip away at the rest. None of this is a loophole; it is a set of savings opportunities that only matter once you know your baseline.

Which buildings Local Law 97 covers

Local Law 97 applies to:

• A single building over 25,000 gross square feet
• Two or more buildings on the same tax lot that together exceed 50,000 square feet
• Two or more condo buildings governed by the same board of managers that together exceed 50,000 square feet
• The capital decisions, with dates. When did the board vote to scope a boiler replacement? When did the reserve study flag the HVAC system? A decarbonization plan is far more credible when the board can show the decision trail behind it.
• The vendor and project history. Energy audits, retrofit bids, contractor scopes, completion dates. This is evidence that planned measures are real and moving.
• The communications. What the board told residents about upcoming work, assessments, and timelines, and when.
• The work order and maintenance trail. Operational changes between major projects (controls, lighting, scheduling) that chip away at emissions.

That last line is the one condo boards miss. If your association runs several buildings under a single board of managers, the city combines them. You can be under 25,000 square feet per building, and still be covered as a portfolio.

Tens of thousands of individual buildings citywide are subject to the law, from typical commercial buildings to the residential co-ops and condos that make up most of the covered stock, and together they account for the majority of building-based emissions in New York. If you have never confirmed whether your address sits on the city's Covered Buildings List, that is the first thing to check.

The two penalties boards actually face

Most coverage talks about the emissions penalty and stops there. Building owners and boards actually face two separate fines, and the second one catches people off guard.

The emissions penalty. $268 per metric ton over your limit, assessed annually. This is the headline number and the one the calculator estimates.

The failure-to-file penalty. Miss the annual report and the city charges your gross floor area times $0.50 for every month the report is late, for up to 12 months. For a 100,000-square-foot building, that is $50,000 a month. You can be comfortably under your emissions limit and still rack up six figures in fines purely for not filing the paperwork. A registered design professional has to certify the report, so this is not a form you complete the night before.

Think of it like a tax return. Owing tax is one problem. Not filing at all is a separate, usually larger, problem.

Where co-op and condo boards stand in 2026

The first compliance period runs 2024 through 2029. The report covering calendar year 2024 was due May 1, 2025. The report for 2025 was due May 1, 2026, with a 60-day grace period that runs through the end of June. If you are reading this in mid-2026, your building should already be well into that second filing.

The limits get stricter in 2030. The caps that took effect in 2024 are the loose ones; the 2030 through 2034 period tightens them significantly, and the city's target runs all the way to net zero by 2050. A building that squeaks under its limit today can blow past the 2030 cap without changing a thing. A boiler replacement or an electrification project is a multi-year capital decision, which means the board that starts scoping in 2026 is on schedule and the board that waits until 2029 is not.

Not every building plays by the carbon-cap rules. Local Law 97 sets different compliance paths depending on the building. Properties with more than 35 percent rent-regulated units, income-restricted affordable housing, and houses of worship fall under Article 321: instead of an emissions limit, they complete a prescriptive checklist of low-cost energy conservation measures. DOB has also issued additional and proposed rules over time that refine how penalties and good-faith pathways work, so confirm the current version before you bank on any single number.

There is also a relief valve. Buildings that cannot hit their limit through operations alone can pursue the Good Faith Efforts pathway: submit a decarbonization plan to DOB, commit to specific energy conservation measures on a documented timeline, and receive a temporary penalty adjustment while the work is underway. DOB reviews milestones. Buildings that file a plan and then fail to execute it lose the protection retroactively and owe the full penalty. Good faith has to be real, and DOB is checking.

What “active management” looks like to DOB

This is where most boards are exposed, and not because of the carbon math. A Good Faith Efforts application, a penalty dispute, or a board defending its decisions to owners all rest on the same thing: a clean operational record. DOB and your own shareholders want to see that the board has been actively managing the building toward compliance, not reacting at the deadline.

In practice, that record is built from unglamorous documentation:

A platform like BuildingLink’s condo management software is built to capture exactly this kind of record. Project tracking, maintenance and work order history, and resident communications live in one system with dates attached. When the board needs to assemble a Good Faith Efforts package or show owners why an assessment is necessary, the history is already there instead of scattered across email threads and one manager's memory. BuildingLink does not file your Local Law 97 report or directly reduce your emissions. It gives the board the documented operational trail that makes a compliance strategy defensible.

The boards that come through the 2024 to 2029 period in good shape will be the ones that treated compliance as a multi-year capital project with a paper trail, not a once-a-year scramble.

See the record behind a defensible Local Law 97 strategy

Your building's Local Law 97 strategy is only as strong as the record behind it. See how co-op and condo boards use BuildingLink to track capital decisions, vendor projects, and resident communications in one place. Request a demo.