Buildings and Efficiency

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.

States with Policy Enacted

In Progress

Partially Enacted

See States List

Key Resources

Building Decarbonization Code

A model building code that amends the 2021 IECC to deliver carbon neutral buildings.

Stretch Codes

An overview of stretch codes and examples of their use.

Model Rules

Building Decarbonization Code

A model building code that amends the 2021 IECC to deliver carbon neutral buildings.

ZERO Code

A model energy code standard that would achieve net-zero carbon emissions for buildings.
2018
Source:

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.

2020
Establishing Policies

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

Filters
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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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Midwest
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.

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Midwest
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.

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Midwest
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.

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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.

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Southeast
Enacted
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The Maine Uniform Building and Energy Code (MUBEC) Stretch Code incorporates 2021 IECC and certain appendices.

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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.

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Southeast
Enacted
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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.

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Northeast 2025
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.

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Midwest
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.

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Midwest
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.

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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.

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Midwest
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.

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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
Midwest
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.

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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
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
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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.

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Southwest
Enacted
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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.

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Northeast 2020
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
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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
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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.

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Southwest
Enacted
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The Oregon Reach Code is a statewide optional energy construction standard approved by the Building Codes Division.

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West 2025
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.

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Northeast
Enacted
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The Rhode Island Stretch Codes are used on a voluntary basis for private and public building construction and renovation projects.

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Northeast 2018
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
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.

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

The State Climate Policy Dashboard tracks only passed policies and does not include bills currently proposed in legislative sessions. The website is intended to illustrate the current status of policies for each state, as well as key resources and model states for each policy.

Much of the information contained in this database is derived from the public domain, with links to resources provided. The information provided is made available solely for general information purposes and does not constitute legal advice. Click here for full Terms of Use.

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