Frequently Asked Questions

Which buildings have to comply with Local Law 97?+
LL97 applies to most buildings over 25,000 square feet in NYC, plus two or more buildings on the same lot that together exceed 50,000 square feet. The emissions cap depends on the building’s occupancy type. Some buildings (rent-regulated, houses of worship, city-owned) are partially exempt.
What happens if I miss the LL97 emissions cap?+
$268 per metric ton of CO2e over the cap, assessed annually. A 100,000 sq ft office building running over its cap by 300 tons is looking at roughly $80,000 per year. The 2030 cap tightens significantly, so buildings that barely pass today may not pass then.
Is Local Law 154 only for new construction?+
No. LL154 bans fossil-fuel-burning equipment over 27,000 BTU/hr in most new buildings starting 2024 or 2027 depending on height, but it also affects major renovations. If you are replacing a boiler, furnace, or water heater in an existing building, check whether your project triggers LL154.
How do LL84 and LL87 relate to each other?+
LL84 is annual benchmarking, you report energy and water use every year. LL87 is a deeper energy audit plus retro-commissioning, required once every ten years. Both apply to most buildings over 25,000 sq ft. LL84 feeds the public data that LL97 caps are calibrated against.
Can Mountain Mechanical help bring my building into compliance?+
Yes. We assess the HVAC side of compliance, model the impact of equipment changes on your LL97 emissions, and handle VRF conversions and heat pump retrofits that move buildings off fossil fuels. Call 833-504-4822 for a building-specific review.

About This Tool

This tool provides a general overview of which NYC building performance laws may apply to your building. It covers the major laws that affect HVAC decisions: Local Law 97 (carbon caps), Local Law 84 (benchmarking), Local Law 87 (energy audits), Local Law 154 (fossil fuel ban), and FISP/LL11 (facade inspection as it relates to rooftop equipment access).

This is a simplified tool for general guidance. Actual compliance requirements depend on your specific block and lot, building classification, and filing history. For definitive compliance guidance, consult with a qualified professional or contact Mountain Mechanical for a building-specific assessment.