The 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 stipulates that the home energy performance report must be prepared by a qualified home energy auditor and adhere to a standardized format developed by the Department of Commerce by November 30, 2025. The report will remain valid for eight years unless significant changes to the property occur. This initiative is designed to empower homebuyers with essential information regarding energy efficiency, ultimately influencing market values and supporting the state's climate goals.