Solar Energy in Thurston County, WA (2026)
1 rule for unincorporated Thurston County, Washington.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Thurston County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Panel Permits
Thurston County does not require a building permit for a residential rooftop photovoltaic solar installation that complies with International Residential Code section M2301.2, per Code § 14.17.030 ([A]105.2, item 17). Fall outside that IRC section's requirements and the installation moves under the county's regular building-permit process.
Thurston County Rooftop Solar Permit Exemption
Few RestrictionsThurston County Code § 14.17.030 ([A]105.2, Item 17)
[A] 105.2 Work exempt from permit. ... Permits shall not be required for the following: Building: ... 17. Residential photovoltaic roof top solar energy installations in compliance with IRC section M2301.2.
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