Navigating the NYStretch Energy Code and What to Expect for 2025

In 2020, the New York State Energy Research and Development Authority (NYSERDA) introduced the NYStretch Energy Code, a more stringent supplement to the 2020 New York State Energy Conservation Construction Code (ECCC). While the entire state must comply with the 2020 ECCC, municipalities have the option to adopt the stricter NYStretch code, making it mandatory within their jurisdictions. Municipalities such as New York City, Ithaca, Tully, Beacon, and Bethel have opted in, recognizing the long-term benefits of enhanced energy efficiency. Additionally, New York is not alone in offering an optional stretch code—Massachusetts was the first state to develop one, followed by states like Illinois, Vermont, Oregon, Rhode Island, and California.

This article provides an overview of the NYStretch code, its key criteria, and its impact on building performance, as well as what to expect from upcoming versions of the energy code.

Understanding the NYStretch Code

The NYStretch code is designed to improve energy efficiency beyond the base state code by setting stricter building performance standards. Its goal is to help municipalities reduce energy consumption, lower carbon emissions, and meet climate goals while supporting the construction of more resilient, cost-effective buildings. While municipalities are not required to adopt the code, it offers a pathway to more sustainable, energy-efficient buildings.

A key driver behind these advancements is the transition toward electrification. Unlike fossil fuels, electricity can be generated from renewable sources such as wind, solar, and hydroelectric power. While not renewable, nuclear energy also offers a reliable, non-carbon-emitting energy source. Government policies, including tax credits and other incentives (e.g., NYSERDA’s Clean Energy Communities Program), are further promoting electrification as a strategy to decrease emissions in New York and across the United States.

Building technologies that prioritize electricity are advancing rapidly. For example, heat pumps—including ductless mini-splits—are an increasingly popular choice for efficient heating and cooling, even in cold climates. NYStretch’s insulation and air sealing requirements help optimize heat pump performance by reducing energy losses, allowing them to operate more efficiently. Technologies such as heat pump water heaters, on-demand water heaters, and high-efficiency LEDs can contribute significantly to energy savings. Solar power, particularly when stored in batteries, can power these technologies, making it possible to construct zero-energy homes or buildings.

Key Criteria of the NYStretch Code

NY Stretch enhances energy efficiency by requiring higher-performance building components and systems. These updates apply to all building types, from single-family homes to commercial buildings, making them more comfortable, cost-effective, and environmentally friendly. Key areas of improvement include:

Stronger Insulation Standards

The NYStretch code, like those in other states, increases the amount of insulation required in roofs, walls, and floors to reduce heat loss and improve energy efficiency. For example, the base energy code for residential buildings in Climate Zone 4—the southernmost part of New York—requires R-20 batt insulation in wood-framed walls. NYStretch adds an extra layer of R-5 continuous insulation. Similarly, for commercial buildings in Climate Zone 4, the base energy code requires an R-38 rating for attic insulation, while NYStretch calls for an R-53 rating to further decrease heat transfer. These improvements are especially beneficial for buildings using heat pumps, as better insulation helps maintain indoor temperatures efficiently.

Tighter Air Filtration Limits

Minimizing air leakage reduces heating and cooling demands, improving indoor comfort and efficiency. NYStretch enforces stricter air filtration limits and may require blower door testing in commercial buildings, depending on structure size and compliance path. A blower door test identifies air leaks commonly found around windows and doors, where the main framing meets the foundation or sill, and in unsealed ventilation openings. By sealing these gaps, buildings can maintain stable indoor temperatures and lower energy costs.

Beyond testing, NYStretch also strengthens requirements for air barriers, sealants, dampers, fenestration, and other building elements that influence air filtration. By further limiting outside air entry, these measures reduce the strain on HVAC systems, making it easier and more efficient to condition indoor air.

Optimized Lighting and Daylighting Controls

While LEDs have significantly improved lighting efficiency, NYStretch further reduces energy waste by requiring occupancy and daylight sensors to dim or turn off lights when natural light is sufficient. It also promotes daylight strategies to maximize natural light use in commercial spaces. These measures help minimize energy consumption and lower operating costs.

Electrification and Renewable Energy Readiness

As New York moves toward a cleaner energy future, NYStretch supports electrification and renewable energy integration by requiring buildings to have a solar-ready zone for powering electric heat pumps, electric vehicles, and other devices. This includes allocating space on rooftops, sloped sides of buildings, or outdoor areas with sufficient sunlight for future solar installations. Additionally, electrical panels must have designated capacity and proper wiring to connect solar systems to the building’s electrical service. These provisions align with state and federal clean energy initiatives, ensuring buildings are prepared for a low-carbon future.

*For a more in-depth summary of differences between the NYStretch code and the 2020 ECCC, click here.

Looking Ahead: The 2025 New York State ECCC Update

New York will soon implement a more stringent energy code based on the International Code Council’s 2024 International Energy Conservation Code and ASHRAE 90.1 2022, the energy standard set by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers. (New York City updated its codes in 2022.) While the specific details and release date are still being finalized, this update is expected to surpass the energy requirements set by the current NYStretch code, Anticipated changes include stricter air leakage and insulation requirements, mandatory U-factors for curtain walls, and insulation to prevent thermal bridges,

This move reflects New York’s ongoing commitment to energy-efficient, low-carbon buildings. Ultimately, the state’s broader goal is to shift to a cleaner energy grid, expand renewable energy sources, and a build a more sustainable economy. As we await the official rollout of these updates, it’s critical for municipalities, builders, and developers to stay informed and prepare for these upcoming changes to ensure compliance.

LaBella’s Code Services Group can assist with NYStretch compliance and upcoming code changes. Whether performing plan reviews for municipalities or providing code consulting for architects, builders, engineers, and state agencies, we help ensure compliance with evolving energy codes while optimizing building performance. Contact our team for more information on how we can help.