NYC Green Roof & Solar Requirements: Local Laws 92 & 94 for New Buildings
5 min read · Updated 2026-08-13
NYC Local Laws 92 & 94 sustainable roof rules: when new buildings and roof reconstructions must add solar PV or a green roof, exceptions, and tax abatements.
What Local Laws 92 & 94 Require
What are Local Laws 92 and 94 of 2019 in NYC?
Local Laws 92 and 94 of 2019 are New York City's "sustainable roof laws." Together they require that new buildings and major roof reconstructions cover 100% of the "available roof area" with a sustainable roofing system — solar photovoltaic (PV) panels, a green (vegetated) roof, or a combination of the two. The requirement is checked and applied by the Department of Buildings (DOB) at the permit stage, so it must be designed into a project from the outset rather than added later. The goal is to advance the city's climate and stormwater objectives by putting every suitable roof to work generating clean energy or managing runoff.
Do the sustainable roof laws apply to existing buildings?
The Local Law 92 and 94 mandate is triggered by new construction and by major roof reconstruction, not simply by owning an existing building. If you are replacing or rebuilding a roof in a way that constitutes a major reconstruction, the Department of Buildings (DOB) will apply the sustainable roof requirement to the available roof area as part of the permit. Routine roof maintenance or minor repairs generally do not trigger it. Because "major reconstruction" is defined in the rules, developers and owners planning significant roof work should confirm with DOB or their design professional whether the project crosses the threshold before filing, so the sustainable roof system can be included in the plans.
What counts as "available roof area" under Local Laws 92 and 94?
The requirement applies to 100% of the "available roof area," which is the roof area remaining after subtracting portions that cannot reasonably host solar or a green roof. Exclusions recognized in the rules include sloped roof sections, required setbacks, mechanical equipment areas, and areas subject to significant shading, among others. In practice this means the mandate rarely covers the entire physical roof footprint, but it does require covering the qualifying flat, unobstructed, unshaded portions. Because the calculation drives both compliance and project cost, the available roof area should be determined early by the design team and confirmed with the Department of Buildings (DOB) at plan examination.
Choosing Solar, Green Roof, or a Combination
Can I choose between solar panels and a green roof in NYC?
Yes. Local Laws 92 and 94 let you satisfy the sustainable roof requirement with solar photovoltaic (PV) panels, a green (vegetated) roof, or a combination of both across the available roof area. The right choice depends on the building's energy strategy, structural capacity, stormwater goals, and economics. Solar PV generates electricity and can help with emissions-cap compliance, while a green roof provides stormwater retention, insulation, and heat-island benefits and may qualify for a tax abatement. Many projects blend the two — for example, solar over some bays and vegetation over others. The design team typically models both options against the building's goals before selecting the mix filed with the Department of Buildings (DOB).
Is there a tax abatement for green roofs in NYC?
Yes. New York City offers a green roof property tax abatement to help offset the cost of installing a qualifying green roof system, and the benefit has been enhanced for green roofs in priority districts identified for their stormwater or heat-island needs. The abatement reduces property taxes based on the qualifying green roof area, subject to program rules and caps. Because eligibility, rates, and the priority-district enhancement have specific requirements, developers weighing a green roof against solar should factor the abatement into the financial comparison and confirm the current terms through the applicable New York City program before filing. The abatement can meaningfully change the economics of choosing vegetation over — or alongside — solar PV.
How does solar on the roof help with Local Law 97 compliance?
Local Law 97 sets greenhouse-gas emissions caps for larger buildings, with penalties for exceeding them. On-site solar photovoltaic (PV) reduces the building's reliance on grid electricity, which can lower the emissions attributed to the building and help it stay under its cap. So while Local Laws 92 and 94 mandate a sustainable roof for new construction and major reconstruction, choosing solar PV to satisfy that mandate can do double duty by contributing to Local Law 97 compliance. Green roofs contribute different benefits — stormwater and insulation — but do not generate the same electricity offset. Developers often model the emissions impact when deciding how much of the available roof area to devote to solar.
Coordinating Roof Requirements
How do solar and green roofs interact with FDNY roof access rules?
Even with a sustainable roof mandated by Local Laws 92 and 94, the roof design must preserve the Fire Department (FDNY) access paths and clearances required for firefighting and rescue. Solar arrays and green roof systems have to be laid out so they do not block required access, ventilation points, or pathways to roof equipment. This is one reason the "available roof area" calculation excludes certain zones, and why the layout is coordinated during design and plan examination with the Department of Buildings (DOB). Developers should engage their design team early to reconcile the sustainable roof coverage with FDNY access requirements, mechanical placement, and parapet conditions so the plans clear review without redesign.
When in the project do the sustainable roof requirements apply?
The Local Law 92 and 94 requirements attach at the permit stage, so they must be addressed when the Department of Buildings (DOB) reviews the plans for a new building or major roof reconstruction. That makes the sustainable roof a design decision, not a finishing touch — the available roof area, the choice between solar and vegetation, structural loads, drainage, and access paths all need to be worked out before filing. Attempting to add compliance late in the process can force costly redesigns or delay the permit. Developers should bring the roof strategy into schematic design and confirm the approach at plan examination so the approved permit already reflects a compliant sustainable roof.
How do parapet requirements affect a green roof or solar install?
Parapets — the low walls at a roof's edge — interact with sustainable roof design in several ways. Their height and condition affect wind loading and edge safety for both solar arrays and green roof systems, and any parapet work must satisfy New York City's annual parapet observation requirement for walls fronting the public right-of-way. When laying out solar or vegetation, keep required clearances from parapets and roof edges, and account for how the sustainable roof system loads or attaches near the parapet. Coordinating the sustainable roof (Local Laws 92 and 94) with parapet safety and the Department of Buildings (DOB) plan review avoids conflicts that would otherwise surface during construction or later inspections.