50-60-802. Enforcement of energy code through builder self-certification. (1) Except as provided in subsection (2), a person who begins construction on a residential building in Montana after October 1, 1993, shall certify in writing to the building owner at the conclusion of construction that the residential building has been constructed in compliance with the energy-efficient construction standards adopted under the provisions of 50-60-203(1).

(2) A person who begins construction on a residential building in Montana after October 1, 2009, shall certify in writing to the building owner at the conclusion of construction that the residential building has been constructed in compliance with the voluntary energy-efficient construction standards adopted by a county, city, or town with a building code enforcement program that has jurisdiction over the construction if the building meets or exceeds those standards.