Franklin County, WA Solar Energy: Panel Permits (2026)

190, Fees, sets permit costs under Section 109 of the 2021 International Building Code and Section R108 of the 2021 International Residential Code, and directs applicants to the attached fee tables, which are based on the February 2020 ICC Building Valuation Data as amended. Within that fee schedule, item 12 of the Plumbing Permit Fee Table specifically prices solar panel installations: a residential installation performed without structural alterations to the building runs a flat $100 permit fee, while a commercial solar installation is priced per the contractor's submitted bid rather than a flat rate.

230 subjects a solar permit to the general permit expiration rule: work must start within 180 days of issuance and the permit lapses after two years unless it falls into one of the chapter's 90-day categories. Because the fee table ties the flat $100 rate specifically to installations without structural alterations, a project that adds structural support, such as reinforcing a roof to carry additional panel weight, would fall outside that flat fee and instead be valued under the general building-valuation fee schedule in the same section, which prices work by square footage or submitted contract value.