20 ILCS 3125/30

The Board, in consultation with the Agency, shall determine procedures for compliance with the Code. These procedures may include but need not be limited to certification by a national, State, or local accredited energy conservation program or inspections from private Code-certified inspectors using the Code. For purposes of the Illinois Stretch Energy Code under Section 55, the Board shall allow and encourage, as an alternative compliance mechanism, project certification by a nationally recognized nonprofit certification organization specializing in high-performance passive buildings and offering climate-specific building energy standards that require equal or better energy performance than the Illinois Stretch Energy Code.