Establishes the buy clean Washington act.

Requires the University of Washington, led by the college of built environments, and in collaboration with the department of enterprise services, to: (1) Analyze existing embodied carbon policy;

(2) Propose methods to categorize structural materials and report structural material quantities and origins, and global warming potential;

(3) Propose methods to establish maximum global warming potential limit;

(4) Convene a task force to give feedback on the proposed methods; and

(5) Report the developed methods, by January 31, 2019, to the legislature.

Requires the department of enterprise services to coordinate with certain projects.

Requires the awarding authorities for these projects to collaborate with the University of Washington college of built environments to test proposed methods and availability of environmental product declarations.