Requires the department of community, trade, and economic development to develop and implement a strategic plan for enhancing energy efficiency in and reducing greenhouse gas emissions from homes, building, districts, and neighborhoods.

Directs the department of community, trade, and economic development and the state building code council to convene a work group to inform the initial development of the strategic plan.

Requires the state energy code to accelerate construction of increasingly energy efficient homes and buildings that help achieve the broader goal of building zero fossil-fuel greenhouse gas emission homes and buildings by the year 2031.

Requires the state building code council to adopt state energy codes that require homes and buildings constructed from 2016 through 2031 to meet certain energy efficiency targets, using the adopted 2006 Washington state energy code as a baseline.

Requires qualifying utilities to maintain records of the energy consumption data of all nonresidential and qualifying public agency buildings to which they provide service.

Requires the department of community, trade, and economic development to recommend to the legislature a methodology to determine an energy performance score for residential buildings and an implementation strategy to use such information to improve the energy efficiency of the state's existing housing supply.