States that strengthened their building energy codes are still seeing steady housing growth. (ACEEE)
Five states that adopted the 2021 International Energy Conservation Code have added 250K+ new single-family homes since the updates took effect—disproving claims that stronger codes slow housing construction.
Studies from Illinois and the Southeast confirm that stricter energy codes have no measurable impact on construction rates—but clear benefits for residents’ comfort, health, and long-term costs.