Solar Energy in Franklin County, WA (2026)
1 rule for unincorporated Franklin County, Washington.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Franklin County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Panel Permits
Installing residential solar panels in unincorporated Franklin County without structural alterations costs a flat $100 permit fee under the county's building permit fee table. Commercial solar installations are priced per the contractor's bid instead of a flat fee.
Franklin County Solar Panel Permit Fee
Some RestrictionsFranklin County Code § 15.12.190
Pursuant to Section 109 of the 2021 International Building Code and Section R108 of the 2021 International Residential Code, the fee for each permit shall be as set forth in the following attached tables for valuations based upon the February 2020 Building Valuation Data as published by the International Code Council and as also amended, permit fee schedule, plumbing and mechanical fee schedule...
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