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Energy Building Codes in Worcester

Construction on House

The Worcester City Council voted to adopt the Specialized Code on September 26, 2023, and it took effect on July 1, 2024. As of July 2026, Worcester is one of 60 municipalities in Massachusetts to have adopted this code.

Visit Massachusetts Building Energy Codes | Mass.gov for information about the current Massachusetts Stretch and Specialized Code.

Massachusetts Building Energy Codes

Massachusetts has three levels of building energy code: the Base Code, the Stretch Code, and the Specialized Code.

The Base Code sets the statewide minimum and applies everywhere in Massachusetts. It is based on the International Energy Conservation Code (IECC) with Massachusetts-specific amendments.

The Stretch Code increases building energy efficiency requirements beyond the Base Code for new construction and major renovations. It is available to municipalities that choose to adopt it. Worcester first adopted the Stretch Code on May 4, 2010, as part of its designation as a Green Community.

In 2009, Massachusetts became the first state to adopt an above-code appendix to the base building energy code. The Stretch Code emphasizes energy performance and was designed to result in cost-effective construction that is more energy efficient than that built to the Base Code. It has been updated every few years, with recent updates taking effect in 2023 and again in 2025. Adopting the Stretch Code is a requirement for participation in the Green Communities program.

The Specialized Code was developed in 2022 by the Massachusetts Department of Energy Resources (DOER), following direction from the Commonwealth's Climate Act of 2021 to create a municipal opt-in code that advances net-zero building performance. Worcester adopted the Specialized Code on September 26, 2023, and it took effect on July 1, 2024.

Specialized Code Requirements

The Specialized Code applies only to new construction and is found as an appendix to both the Residential Low-Rise Stretch Energy Code (225 CMR 22.00) and the Commercial Stretch Energy Code (225 CMR 23.00).

The Specialized Code requires:

  • New multifamily housing over 12,000 square feet meet the Passive House standard
  • No additional requirements beyond the Stretch Code for all-electric new construction (except for multifamily housing over 12,000 square feet which is required to meet Passive House standard)
  • Any new residential or commercial construction using fossil fuel combustion systems (except multifamily housing over 12,000 square feet) to:
    • Provide pre-wiring for future HVAC and appliance electrification
    • Install a minimum amount of solar (with some exceptions for shading)
    • For homes over 4,000 square feet, install enough solar or other renewables to offset the home's energy use

Because these requirements are updated periodically by the Massachusetts Department of Energy Resources (DOER), always check Massachusetts Building Energy Codes | Mass.gov for the most current information.

Resources

Code Language and Technical Guidance: Code requirements are maintained by the Massachusetts Department of Energy Resources (DOER). Visit Massachusetts Building Energy Codes | Mass.gov for the latest code language, webinars, technical guidance documents, and resource guides.

Financial incentives:

Trainings and Technical Assistance: Available through Mass Save at Mass Save | Partners | Energy Code Training & Technical Support and through organizations such as Passive House MA at Passive House Massachusetts.

Energy Code Hotline: Call early in your planning process for guidance on both the Stretch and Specialized codes.
Phone: 1-855-757-9717 | Email: energycodesma@psdconsulting.com

Inspectional Services: For project-specific questions, contact the City directly.
Phone: 508-799-1198 | Email: inspections@worcesterma.gov

Have a Question?

Passive House is a rigorous design and construction standard that dramatically reduces building energy use by focusing first on the building envelope – insulation, windows, and airtightness. It's increasingly common in Massachusetts affordable housing development.

Wiring for electrification is quick and inexpensive at the time of construction. Retrofitting it later is costly and disruptive. The pre-wiring requirement protects future occupants from high upgrade costs as the state moves toward a net-zero economy by 2050.

Planning ahead is critical. Depending on the size and type of your project, this may mean selecting the right compliance pathway before designs begin, hiring a Passive House design expert, or engaging a HERS rater early – all of these are much easier and cheaper to do during project conception, than to retrofit later. Contact a HERS rater and National Grid early to ensure work orders are in place and prevent costly delays.

Not necessarily. All-electric homes using heat pumps and Mass Save incentives can be cheaper to build than fossil fuel homes. Heat pumps replace both the furnace and air conditioning system, eliminating the need for separate cooling equipment. Building costs vary widely based on materials, market conditions, and builder experience with the codes. Experienced builders often achieve costs comparable to Base Code construction, while those new to the requirements may face an initial learning curve.

No. The Specialized Code does not add EV charging requirements beyond what the Stretch Code already requires.

No. Buildings that use gas or oil can still be built, and gas cooktops, water heaters, and other appliances are still allowed. Buildings that use fossil fuels alongside electric heating and cooling are considered "mixed-fuel" and must meet additional requirements, including pre-wiring for future electrification and on-site renewable energy offsets.

It depends. Although Worcester has adopted the Specialized Energy Code, it does not apply to every project. The Specialized Energy code applies to new buildings only. This means a freestanding detached ADU must comply with the Specialized Energy code. However, if your ADU is attached to an existing building, it is considered an addition or renovation and must follow the standard Stretch Energy Code instead. Energy requirements for ADUs are generally less strict, when compared to new homes, to help encourage their development.

Contact Information

Address

Building & Zoning
25 Meade Street
Worcester, MA 01610

Contact

Phone: 508-799-1198
Fax: 508-799-8544
inspections@worcesterma.gov

Hours

Monday - Friday
8 a.m. - 4:30 p.m.