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King County Updates Building Codes with Optional Appendix for Solar Readiness

Posted on Oct 14, 2022 in:
  • Industry Issues
  • Building Codes
  • Advocacy

This week MBAKS staff and interested members met with leadership from King County Permitting for updates related to the recent building code adoption and new requirements for solar ready installation. After nearly a two year debate and pushback from the industry, King County updated its Code with the optional Solar-Ready Appendix  to the 2018 Washington State Residential Council. This appendix requires set aside of 300 sq. ft. of unshaded/uninterrupted roof area for new single family residential (SFR) and 150 sq. ft. for townhouse and duplex with a capped penetration sleeve and dedicated breaker. An exemption is granted if 70% of the roof area is shaded. The solar-ready requirement becomes effective Jan. 1, 2023.

To ease the transition for preapproved basics, County staff will accept a slip sheet added to the plans.
If you have questions on the requirements, please contact Kim Barker, Plans Examiner 206.848.0368.

For more information, please see the Oct. 12 presentation.


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