NYC Local Law 154: The Electrification Law Explained
Local Law 154 of 2021 is New York City's electrification mandate for new construction. It prohibits the use of fossil fuels in most new buildings — and it's a prerequisite for the ULEB 5% FAR bonus. Here's what every developer and architect needs to understand.
What Is Local Law 154?
Local Law 154 of 2021 (LL154) amended the NYC Administrative Code to prohibit fossil fuel combustion systems — including natural gas, heating oil, and propane — in most newly constructed buildings in New York City. Signed into law in December 2021, it represents one of the most significant shifts in NYC building regulation in a generation.
The law's goal is to eliminate carbon emissions from new construction as part of NYC's commitment to an 80% reduction in citywide greenhouse gas emissions by 2050. Buildings are responsible for approximately 70% of NYC's greenhouse gas emissions, and new construction provides a once-in-a-building-lifetime opportunity to eliminate fossil fuel use from the start.
If you are building a new building in NYC, you will need to design an all-electric building. Local Law 154 is not optional, and the timeline is already in effect for most project types.
What Does LL154 Actually Prohibit?
Local Law 154 prohibits the installation of any equipment that uses the combustion of fossil fuels in new construction. This means:
- No gas-fired boilers for heating or domestic hot water
- No gas-fired furnaces or packaged units
- No gas-fired water heaters (residential or commercial)
- No gas ranges or commercial cooking equipment
- No oil-fired systems of any kind
- No propane-fueled appliances
- No backup generators fueled by fossil fuels in covered buildings (subject to specific exemptions)
In practical terms, all of a building's energy needs — heating, cooling, domestic hot water, cooking, and other end-uses — must be met by electricity.
Which Buildings Are Affected?
LL154 covers new construction in New York City on a phased timeline based on building size and type:
| Building Type | Effective Date | Covered? |
|---|---|---|
| Buildings under 7 stories (low-rise) — new construction | December 31, 2023 | Yes — in effect |
| Buildings 7 stories and above (high-rise) — new construction | December 31, 2027 | Yes — effective 2027 |
| Existing buildings — boiler replacements (heating only) | Phased from 2025+ | Partial — see note |
| Hospitals, emergency services, certain industrial uses | Exemptions apply | Exempt (specific uses) |
| Temporary construction trailers and similar structures | Exemptions apply | Exempt |
If you are planning a new high-rise (7+ story) building with a construction document filing date after December 31, 2027, your building must comply with LL154. Projects already in design should confirm their filing timeline with their architect. Projects expected to file after 2027 should plan for all-electric systems now.
The Electrification Timeline
LL154 signed into law
NYC Mayor signs Local Law 154 as part of the broader NYC climate package. Phased effective dates established for different building types.
Low-rise new construction: in effect
New construction buildings under 7 stories filed with the DOB after this date must be all-electric. No fossil fuel combustion systems permitted.
Existing building boiler replacement rules begin
Phased rules for fossil fuel boiler replacements in existing buildings begin to take effect, depending on building size and equipment type.
High-rise new construction: in effect
New construction buildings 7 stories and above filed with the DOB after this date must be all-electric. Projects in design now should plan for this requirement.
What Electrification Means in Practice
Designing an all-electric building requires different decisions at nearly every layer of the mechanical and plumbing systems. Here's what the shift looks like in practice:
Heating and Cooling
Gas boilers and furnaces are replaced by electric heat pumps. The most common systems used in NYC new construction under LL154 include variable refrigerant flow (VRF) heat pump systems, water-source heat pump (WSHP) systems, and air-to-water heat pump systems. Each has different implications for first cost, operating efficiency, and mechanical room space requirements.
Domestic Hot Water
Gas water heaters are replaced by heat pump water heaters (HPWHs) or electric resistance water heaters. Heat pump water heaters are significantly more efficient and are the preferred solution for most building types. They require adequate space for air circulation and produce some noise — factors that must be addressed in the architectural design.
Cooking
Gas ranges in residential units are replaced by electric induction or resistance cooktops. For commercial kitchens — hotels, restaurants, residential buildings with amenity kitchens — the transition to all-electric cooking requires early coordination with food service consultants, as induction technology for commercial cooking has advanced rapidly but requires specific hood ventilation adjustments.
Backup Power
Buildings that require backup generation for life safety systems must use non-fossil-fuel alternatives or work within specific exemptions. Battery energy storage systems (BESS) are increasingly used for backup power in LL154-compliant new construction, though the cost and space implications require early planning.
LL154 and the ULEB 5% FAR Bonus: The Connection
Local Law 154 compliance is not just a regulatory requirement — it's the first of two criteria that unlock the ULEB 5% FAR bonus under the NYC Zoning Resolution.
The zoning resolution defines an Ultra-Low Energy Building as a building that satisfies both:
- Full electrification consistent with Local Law 154 of 2021
- Energy performance at least 15% better than the NYC Energy Conservation Code baseline
Because every ULEB-eligible project must comply with LL154 regardless, the electrification requirement represents no additional cost burden for projects pursuing the FAR bonus. The incremental investment to earn the 5% bonus is limited to the energy efficiency measures needed to hit the 15% performance threshold — typically envelope improvements and mechanical system upgrades above baseline efficiency.
If your project is required to comply with LL154 (which it almost certainly is for new construction today), you are already halfway to qualifying for the ULEB FAR bonus. All that remains is demonstrating 15% energy performance improvement through a qualified energy model. The ROI on that step is almost always positive.
LL154 in the Context of NYC's Climate Laws
Local Law 154 is one of several interconnected NYC climate laws that developers and property owners need to understand:
Electrification mandate
Prohibits fossil fuel combustion in most new construction. Prerequisite for ULEB FAR bonus.
Carbon emissions caps
Sets greenhouse gas emission limits for existing buildings over 25,000 SF, with penalties beginning in 2024 and escalating through 2030.
Energy benchmarking
Requires annual energy and water benchmarking reports for buildings over 25,000 SF using EPA's ENERGY STAR Portfolio Manager.
5% FAR incentive
Rewards new construction that meets LL154 electrification and achieves 15%+ energy performance with 5% additional floor area.
Common Questions About LL154
Can we keep gas for the restaurant tenant?
No. LL154 covers all fossil fuel combustion in covered buildings, including commercial kitchen equipment. If your new construction building has a ground-floor restaurant, that restaurant must operate on all-electric cooking equipment. This is a significant design and tenant coordination issue — address it during lease negotiations and in the base building design.
Does LL154 apply to buildings filing now?
If your building is under 7 stories and you have not yet filed construction documents, yes — LL154 is in effect and your building must be all-electric. If your building is 7 stories or taller and you file before December 31, 2027, you are not yet required to comply with LL154, though you would not qualify for the ULEB FAR bonus without electrification.
What about a gas generator for emergency power?
Certain emergency and standby power systems may qualify for exemptions under LL154, particularly for life safety systems in hospitals and emergency service facilities. Standard commercial or residential backup generators do not automatically qualify for exemptions. Consult with a code compliance professional before designing fossil-fueled backup systems into LL154-covered projects.
We heard LL154 was paused — is that true?
In early 2025, New York Governor Hochul issued a temporary pause on certain All-Electric Buildings Act provisions for high-rise buildings pending legislative review. The status of LL154 has been subject to policy discussion at both the state and city level. As of the date of this article, work with your design team and a qualified energy code consultant to confirm the current effective requirements for your specific project and filing timeline.
Next Steps for Your Project
If you are planning new construction in NYC today, the practical steps are:
- Confirm your project's filing timeline and which LL154 provisions apply.
- Coordinate with your MEP engineer early on all-electric mechanical system selection — heat pump sizing, hot water strategy, and backup power.
- Engage a ULEB energy modeler to determine whether the 5% FAR bonus is achievable on your project, and what design changes would be required.
- Build LL154 compliance and ULEB documentation into your permitting schedule from the start.
ULEB and LL154 — handled together
ULEBnyc specializes in energy modeling for LL154-compliant new construction. We'll confirm your eligibility, run the ULEB energy model, and handle DOB submissions from start to approval.
Talk to a ULEB Specialist →