IECC Residential Proposals

2021 IECC: Flexibility for the Future | 2021 IECC: Ready and Resilient | 2021 IECC: Commercial

The following proposals address a wide range of issues and improve the code by improving efficiency, clarifying requirements and creating greater flexibility for code users. Official public comments which suggest changes to the proposal are also included below.


Code Change Proposal Number and Description in Numerical Order

RE 7. Approved as Modified by Public Comment 1. Increases the installed lighting efficacy requirements to 65 lumens/watt for lamps and 45 lumens/watt for luminaires. Eric Makela, New Buildings Institute, representing New Buildings Institute

RE 29. Approved as Submitted by Code Development Committee. Results in better wall insulation in cold climates (Climate Zones 4 and 5) by requiring cavity and continuous insulation. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an Energy-Efficient Economy

RE 32. Approved as Submitted by Code Development Committee. Results in increased slab edge insulation in Climate Zone 3 and increased insulation performance in Climate Zones 4 and 5. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an Energy-Efficient Economy

RE 33. Approved as Submitted by Code Development Committee. Increases ceiling insulation in hot climates (Climate Zones 2 and 3). Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an EnergyEfficient Economy

RE 35. Approved as Modified by Public Comment 1. Results in better windows in Climate Zones 2 – 4. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an Energy-Efficient Economy

RE 36. Approved as Submitted by Public Comment. Results in better insulation in above-and below-grade walls.in Climate Zones 4 to 8. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an Energy-Efficient Economy

RE 37. Approved as Submitted by Public Comment. Requires a solar heat gain coefficient (SHGC) of 0.40 in Climate Zone 5. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an Energy-Efficient Economy

RE 112. Approved as Submitted by Public Comment. Reduces heat and conditioned air loss. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an Energy-Efficient Economy

RE 126. Approved as Submitted by Public Comment. Reduces water heating energy use by requiring more efficient water heating systems. Proponent: Lauren Urbanek, representing Natural Resources Defense Council

RE 139 Approved as Submitted by Public Comment. Requires Heat Recovery Ventilators (HRVs) or Energy Recovery Ventilators (ERVs) are installed for ventilation systems in Climate Zones 7 and 8. Proponent: Mike Moore, Newport Ventures, representing Broan-NuTone

RE 147. Approved as Submitted by Public Comment. Requires buildings be electrification ready. Proponent: Lauren Urbanek, representing Natural Resources Defense Council
Public Comments

RE 148. Approved as Modified by Public Comment 1 & 2. This proposal adds a requirement for R-occupancy buildings (such as multifamily buildings) to meet the exterior lighting requirements in the commercial section. Proponent for this proposal is Eric Makela, representing New Buildings Institute.
Public Comments

RE 151. Approved as Submitted by Public Comment. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, representing American Council for an Energy-Efficient Economy
Public Comments

RE 182. Approved as Submitted by Public Comment. Requires the minimum level of efficiency for the building envelope be no worse than the prescriptive requirements of the current code if using renewables to comply with the Energy Rating Index (ERI) approach. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, representing American Council for an Energy-Efficient Economy

RE 192. Approved as Submitted by Public Comment. Improves the target Energy Rating Index (ERI) values, which were weakened from the 2015 to the 2018 version of IECC. Proponent: William Fay, Energy-Efficient Codes Coalition, representing Energy-Efficient Codes Coalition; Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Maureen Guttman, BCAP-IBTS, representing BCAP-IBTS; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an Energy-Efficient Economy

RE 209. Approved as Submitted by Public Comment. This Flex Point option that allows builder to select one of five packages options to achieve a 5% increase in efficiency. Proponent: Daniel Bresette, Alliance to Save Energy, representing Alliance to Save Energy; Harry Misuriello, American Council for an Energy-Efficient Economy, representing American Council for an Energy-Efficient Economy

RE 223. Approved as Modifed by Public Comment 2. Provides an optional path for jurisdictions that want to add an Appendix to the code that achieves zero energy. Proponent: Eric Makela, New Buildings Institute, representing New Buildings Institute; Lauren Urbanek, Natural Resources Defense Council, representing Natural Resources Defense Council


Contact Amy Cortese, NBI director of programs, at [email protected], with any questions.

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