Concerning energy labeling of residential buildings.

HB 1015 requires cities and counties in Washington to mandate home energy performance reports before residential properties (like single-family homes and townhouses) are advertised for sale. The reports, valid for eight years, must include a U.S. Department of Energy home energy score, annual energy costs, greenhouse gas emissions estimates, and efficiency improvement recommendations. Local governments must first assess financial impacts on low-income sellers and implement cost-mitigation programs before enforcing the requirement. The bill also directs the Department of Commerce to create a standardized report format by November 2025.