Washington

For Washington, energy code in force is 2021 EDITION OF THE INTERNATIONAL ENERGY CONSERVATION CODE, RESIDENTIAL; state amendments is ADOPTION AND AMENDMENT OF THE 2021 EDITION OF THE INTERNATIONAL ENERGY CONSERVATION CODE, RESIDENTIAL; statute / rule citation is WAC 51-11R, verified against its source on 2026-08-18.

State: Washington verified
Energy code in force: 2021 EDITION OF THE INTERNATIONAL ENERGY CONSERVATION CODE, RESIDENTIAL verified
State amendments: ADOPTION AND AMENDMENT OF THE 2021 EDITION OF THE INTERNATIONAL ENERGY CONSERVATION CODE, RESIDENTIAL verified
Statute / rule citation: WAC 51-11R verified

Sourceapps.leg.wa.gov

Verified2026-08-18

Review by2027-02-14

DatasetWhich energy code each US state enforces for new homes: the IECC edition (or state equivalent) actually in force, with effective dates and amendments, from the state rules themselves

What the source says

STATE BUILDING CODE ADOPTION AND AMENDMENT OF THE 2021 EDITION OF THE INTERNATIONAL ENERGY CONSERVATION CODE, RESIDENTIAL

— apps.leg.wa.gov, retrieved 2026-08-18

Source

apps.leg.wa.govhttps://apps.leg.wa.gov/wac/default.aspx?cite=51-11R

Last verified against source: 2026-08-18. Due for re-check by 2027-02-14. This page as Markdown · OKF bundle · full dataset as JSON.