Solar Permit requirements across Washington
By Mario Bailey Last verified 2026-06-17
Requirements and size thresholds for solar permits vary by locality. The table below compares what each Washington county or city requires. Always confirm with the local office before starting.
What to know about solar permits in Washington
Solar permits in Virginia usually cover the rooftop PV system and its electrical interconnection. Costs depend on system size and your locality, and many homeowners weigh financing options such as solar loans against paying up front. Some Virginia localities use SolarAPP+ for faster automated approvals. Always use a licensed electrical or solar contractor, since the work must pass inspection.
| Locality | Permit required? | Typical threshold |
|---|---|---|
| Bellevue | Conditional | electrical permit required for all solar systems; building permit not required for rooftop single-family systems with dead load under 3.5 lbs per sq ft and panels no more than 18 inches above roof surface |
| King County | Conditional | roof-mounted solar PV panels weighing less than 4 pounds per square foot on residences do not require a building permit; heavier installations require a permit |
| Seattle | Yes | Not specified |
| Tacoma | Not confirmed | Not specified |