Stretch Building Energy Codes
While many states have adopted mandatory building and building energy codes, local jurisdictions have the power to adopt regulations that are more rigorous than state codes. These are known as stretch codes, as opposed to the base code, and result in more energy efficiency and thus more energy savings. Local governments can use stretch codes to incorporate technologies, methodologies, and regulations that are not included in statewide mandates. Often, stretch codes will be performance-based, which measure the overall energy usage of a building.
Key Resources
Building Decarbonization Code
Stretch Codes
Model Rules
Building Decarbonization Code
ZERO Code
Model States
Illinois
The 2023 Illinois Stretch Codes incorporates 2021 IECC with amendments for residential buildings and 2024 IECC for commercial buildings.
The 2026 Illinois Stretch Energy Code is currently under development.
Massachusetts
The Stretch Energy Code is 2021 IECC with Massachusetts amendments, and the Specialized Code is a municipal opt-in code that is designed to ensure new construction is consistent with the state's target of net-zero emissions by 2050.
New York
The NYStretch Energy Code: 2020 is a voluntary locally adopted stretch energy code that offers municipalities a more energy-efficient alternative to the minimum state energy code.
Vermont
The Vermont Residential Energy Building Standards (RBES) Stretch Code is a building energy code for residential buildings that achieves greater energy savings than the statewide RBES. In September 2025, Governor Scott issued an executive order that reinstated the 2020 building codes, so projects can comply with the 2020 or 2024 Stretch Codes.
Stretch Building Energy Codes By State
| Status | State Sort descending | Region | Components | Year Enacted | |
|---|---|---|---|---|---|
| Not Enacted |
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Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
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Southeast | |||
| Not Enacted |
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Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
West | |||
| Not Enacted |
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Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
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Southwest | |||
| Not Enacted |
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Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
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Southeast | |||
| Enacted |
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The California Green Building Standards (CALGreen) include voluntary reach codes for local jurisdictions wishing to exceed minimum building requirements. Establishing Policies
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West | |||
| Enacted |
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State law requires local jurisdictions to adopt and enforce the 2021 IECC and the Colorado Model Electric Ready and Solar Ready Code upon updating any other building code between July 1, 2023 and June 30, 2026. Cities and counties with building codes must adopt the Model Low Energy and Carbon Codes, which is 2024 IECC with amendments, or a code that will achieve greater energy efficiency and emissions reductions, when they update any other building codes after July 1, 2026. The Model Low Energy and Carbon Code: Larger homes over 7,500 square feet must achieve net-zero energy and cover all energy use with on-site renewable options, such as solar panels or a community solar garden. Homes under 5,000 square feet must meet base-level efficiency standards, and homes between 5,000 and 7,499 square feet must meet more stringent efficiency standards. The code also encourages heat pump adoption. Local governments can also voluntary adopt the Model Green Code, which addresses energy and water use efficiency, electrification, low carbon building materials, and other strategies to reduce the carbon footprint of new buildings. Establishing Policies
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|
West | 2026 | ||
| Not Enacted |
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Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Northeast | |||
| Not Enacted |
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Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
West | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
West | |||
| Enacted |
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The 2023 Illinois Stretch Codes incorporates 2021 IECC with amendments for residential buildings and 2024 IECC for commercial buildings. The 2026 Illinois Stretch Energy Code is currently under development. Establishing Policies
Empty column
|
Midwest | 2024 | ||
| Not Enacted |
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Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Enacted |
Empty column
The Maine Uniform Building and Energy Code (MUBEC) Stretch Code incorporates 2021 IECC and certain appendices. Establishing Policies
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|
Northeast | 2021 | ||
| Not Enacted |
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Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Enacted |
Empty column
The Stretch Energy Code is 2021 IECC with Massachusetts amendments, and the Specialized Code is a municipal opt-in code that is designed to ensure new construction is consistent with the state's target of net-zero emissions by 2050. Establishing Policies
Empty column
|
Northeast | 2025 | ||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
West | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
West | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Northeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Northeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southwest | |||
| Enacted |
Empty column
The NYStretch Energy Code: 2020 is a voluntary locally adopted stretch energy code that offers municipalities a more energy-efficient alternative to the minimum state energy code. Establishing Policies
Empty column
|
Northeast | 2020 | ||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southwest | |||
| Enacted |
Empty column
The Oregon Reach Code is a statewide optional energy construction standard approved by the Building Codes Division. Establishing Policies
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|
West | 2025 | ||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Northeast | |||
| Enacted |
Empty column
The Rhode Island Stretch Codes are used on a voluntary basis for private and public building construction and renovation projects. Establishing Policies
Empty column
|
Northeast | 2018 | ||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
West | |||
| Enacted |
Empty column
The Vermont Residential Energy Building Standards (RBES) Stretch Code is a building energy code for residential buildings that achieves greater energy savings than the statewide RBES. In September 2025, Governor Scott issued an executive order that reinstated the 2020 building codes, so projects can comply with the 2020 or 2024 Stretch Codes. Establishing Policies
Empty column
|
Northeast | 2025 | ||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
West | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Southeast | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
Midwest | |||
| Not Enacted |
Empty column
Stretch building energy codes are an optional, more stringent building code established by the state that local jurisdictions can adopt to require that newly constructed buildings are more efficient than the baseline state codes. Empty column
|
West |