US lawWashingtonRegulationsTitle 51 — ENTERPRISE SERVICES, DEPARTMENT OF (BUILDING CODE COUNCIL)Chapter 51-50 — STATE BUILDING CODE ADOPTION AND AMENDMENT OF THE 2021 EDITION OF THE INTERNATIONAL BUILDING CODE51-50-480907WAC 51-50-480907WAC 51-50-480907. Energy conservationLast amended: 2021Year: 2026Length: 22 wordsOfficial source 907.1 Minimum requirements. Level 3 alterations to existing buildings or structures shall comply with the Washington State Energy Code (chapter 51-11C WAC).PreviousWAC 51-50-480809NextWAC 51-50-481002