The proposed bill aims to enhance energy efficiency and reduce greenhouse gas emissions in existing residential buildings in Washington State by establishing a home energy labeling program. It mandates that owners of various types of residential units, including single-family homes and duplexes, obtain and provide a home energy performance report before their property can be publicly advertised for sale. This report must include a home energy score, estimates of energy usage and costs, greenhouse gas emissions, and recommendations for efficiency improvements. Additionally, cities and counties are required to conduct a financial impact analysis to mitigate costs for low-income sellers before implementing this requirement.

Furthermore, the bill directs the Department of Commerce to develop a standardized format for these home energy performance reports by November 30, 2025. The reports must be prepared by certified home energy auditors and will remain valid for eight years, provided there are no significant changes to the property. The legislation emphasizes the importance of making energy efficiency information accessible to homebuyers, thereby promoting informed decision-making and potentially increasing the market value of energy-efficient homes.