Significant changes are coming to Michigan’s Energy Code starting April 22, 2025. These updates will impact all new buildings, additions, and renovations of existing structures across the state. Here’s a quick breakdown of what to expect—and how it might affect your next project.

What’s Changing?

Michigan is moving from the 2015 Energy Code (referencing IECC 2015 / ASHRAE 90.1-2013) to the 2021 Energy Code, which references either:

• Michigan’s amended version of IECC 2021, or
• ASHRAE 90.1-2019

Note: Projects must comply with one reference code — no cherry-picking between standards.

Key Impacts of the New Code

• Energy Reduction: An estimated 4.7% energy savings compared to ASHRAE 90.1-2016
• Cost Savings: Approximately $0.073/sq. ft. in operating cost savings (Climate Zone 5A)
• Code Enforcement: All projects submitted to the Bureau of Construction Codes (BCC) after April 22, 2025, must comply, though an official definition of this timeline is still pending

Compliance Pathways

You can follow one of three approaches:

1. Prescriptive
2. Energy Cost Budget (ECB)
3. Performance Rating Method (PRM)

What’s New and Noteworthy?

• Commissioning Updates:
  • Verification and Testing (V+T) is now required for projects under 10,000 SF
  • Fundamental commissioning is still required for projects over 10,000 SF
  • New envelope commissioning via programmatic approach or Whole Building Air Testing (WBAT)
• Electrical + HVAC Upgrades:
  • Higher performing envelope components and systems
  • Stricter requirements for HVAC one-for-one replacements, including new controls and energy management
  • Controlled receptacle outlets for 50% of outlets using occupancy sensors will now be required in offices, conference rooms, break rooms, and classrooms.
  • Added metering: New buildings must separately monitor energy use by category (HVAC equipment, interior lighting, exterior lighting, receptacles, pool equipment), with exceptions for minor loads under 10%

Budget Considerations

While these changes should drive down operational energy and costs, be prepared for potential construction cost increases due to:

• Added commissioning efforts
• Extra wiring for outlet controls
• New metering requirements
• Upgrades to meet envelope and equipment performance standards