2024 IECC Code Change Proposal Updates

June 2022 Updates

The full consensus committees approved several NBI code proposals, a number of proposals that will improve the efficiency of existing buildings including:

CEPI-217 which requires existing buildings undergoing an addition, alteration or change of occupancy to be more efficient by obtaining a certain number of energy credits in Section C406
CEPI-219 which requires new ducts serving additions to be tested
CEPI-227 which requires new HVAC systems replacements in existing buildings to have code compliance controls
CEPI-228 which requires new HVAC equipment in existing buildings to be sized correctly which reduces energy use, comfort, increases equipment lifetime, and improves dehumidification
REPI-144 which adds a requirement that large additions and large alterations to existing buildings include additional efficiency options from R408
REPI-86 which improves and clarifies key duct testing criteria and application to improve compliance and verification
REPI-89 which improves and clarifies the application of hot water pipe insulation
REPI-93 which expands the requirements for HRV/ERV to be included in climate zones 5 and 6
REPI-18 which shifts the additional efficiency requirements of R408 from packages to minimum number of credits based on a range of additional efficiency measures
REPI-161 which clarifies the renewable energy terminology used in the Zero Energy Home Appendix (Appendix RC)

May 2022 Updates

The full consensus committees approved several NBI code proposals, including:

CEPI-138 was approved by the full Commercial Consensus Committee. In the 2021 IECC, energy monitoring is required for buildings 25,000 sf or larger. This proposal requires buildings 10,000 sf or larger to install energy monitoring equipment so that building owners can better track energy consumption and meet the requirements of future benchmarking and disclosure ordinances and building performance standards.
CEPI-229 was approved by the full Commercial Consensus Committee. This proposal requires retrocommissioning when new water heating systems or mechanical systems are installed in existing buildings. Buildings on average reduce their energy use by 12% after retrocommissioning is performed.
CECPI-5 was approved by the full Commercial Consensus Committee. This proposal is a consensus proposal developed by Architecture 2030, NBI, Solar Energy Industry Association, 2050 Partners, and Edison Electric Institute. The proposal is a revision to the commercial net zero building appendix.
CEPI-140 was approved by the full Commercial Consensus Committee. This proposal requires the installation of monitors to track the energy used by electric vehicles (EVs). By separately tracking the energy used by EVs, building owners can better understand and manage the overall energy use in buildings.
REPI-68 was approved by the full Residential Consensus Committee requiring cool roofs for Climate Zones 0-3. A cool roof is a relatively inexpensive energy conservation measure to passively reduce cooling load in warmer regions. Cool roofs strongly reflect sunlight and efficiently radiate heat away from the roof surface therefore additionally reducing the urban heat island effect.
REPI-158 was approved by the full Residential Consensus Committee. This proposal requires documentation for renewable energy installation. This confirms that renewable energy certificates (RECs) will be properly tracked to the owner of the system.
REPI-163 was approved by the full Residential Consensus Committee. This proposal updates the Energy Rating Indexes for the Zero Home Appendix to a level that almost meets the Passive House standard. These efficiency improvements means the Zero Energy Homes will require less overall energy, reducing the size of renewable energy systems needed and increasing occupant comfort.
REPI-145 was approved by the full Residential Consensus Committee. This proposal requires duct testing for large existing building alterations. This will remedy existing buildings that have poor functioning ductwork, leading to increased occupant comfort.

April 2022 Updates

The full consensus committees approved several NBI code proposals, including:

CECPI-2 was approved by the full Commercial Consensus Committee. This proposal—a result of a collaboration between NBI and U.S. Dept. of Energy (DOE) with input from working group members from Solar Energy Industries Association, California Energy Commission, 2050 Partners, National Electrical Manufacturers Association, and the Department of Consumer and Regulatory Affairs—requires all new commercial buildings to install renewable energy generation on site.
CEPI-58 was approved by the full Commercial Consensus Committee. This proposal amends the air leakage testing requirements for multifamily commercial buildings, and its success included critical support from Steven Winter Associates and Holt Weston Consultancy.
REPI-28 was approved by the full Residential Consensus Committee. This proposal accepted modifications based on NBI’s REPI-29 and included collaboration with manufacturers, Northwest Energy Efficiency Alliance, and 2050 Partners to create a consensus version. It requires better performance from windows across all climate zones.

March 2022 Updates

Both the Residential and Commercial consensus committees have approved several NBI code proposals, including:

CECPI-1 was approved by the full Commercial Consensus Committee. This proposal, a result of a collaboration between NBI, ChargePoint, Edison Electric Institute (EEI), other national electric vehicle partners, and the U.S. Department of Energy (DOE), requires a certain percentage of parking spaces for new commercial buildings to have EV chargers, and a certain percentage to have the infrastructure to be able to cost-effectively install chargers in the future.
CEPI-012-21 Part II was approved by the full Commercial Consensus Committee. This proposal allows only biomass waste to count as a renewable energy resource.
CEPI-185 was approved by the full Commercial Consensus Committee. This proposal increases the efficacy of lighting used in horticultural facilities.
REPI-69 was approved by the full Residential Consensus Committee. This proposal Aligns requirements for multifamily buildings across commercial and residential provisions.

February 2022 Updates

Both the Residential and Commercial consensus committees have approved several NBI code proposals, including:

REPI-151 requiring right-sizing for equipment replacements was approved 30-7 by the Residential Consensus Committee.
REPI-152 requiring code-compliant controls for equipment replacement was approved by the Residential Consensus Committee.
CEPI-142 requiring grid integrated solar/energy storage inverters was approved by the Commercial Consensus Committee.
CEPI-215 passed the Commercial Consensus Committee. It expands commissioning requirements for buildings so that buildings greater than 10,000 square feet are commissioned, which aligns with the square footage requirements for many existing building policies currently in place.

January 2022 Updates

The 2024 IECC subcommittees have begun meeting to evaluate code change proposals. Several NBI code proposals have recently been approved in subcommittee meetings, and now require a vote by the full consensus committee. These include the following Commercial proposals:

CEPI-185-21 (horticultural lighting) was approved by the Commercial Electrical, Power, Lighting and Renewables subcommittee.
CEPI-12-21 Part II (biomass) was approved by the Commercial Electrical, Power, Lighting and Renewables subcommittee.
EV consensus proposal (a combination of CEPI-146 (NEVA) CEPI-26 (ChargePoint), CEPI-140 (NBI), CEPI-201 (EEI), and CEPI-258 (DOE/PNNL)), was approved by the Commercial Electrical, Power, Lighting and Renewables subcommittee.

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2024 IECC Code Change Proposal Synopsis