Panel Permits: Kent vs Seattle
How do panel permits rules compare between Kent, WA and Seattle, WA?
Kent and Seattle have similar restriction levels.
Kent, WA
King County
Kent uses the Washington State Building Code for rooftop solar. Most residential PV systems need an electrical permit from L and I and a structural review from Kent.
View full Kent rules →Seattle, WA
King County
Seattle requires building permits for solar panel installations under SMC Title 22, but has streamlined the process with expedited review for standard residential rooftop systems to encourage renewable energy adoption.
View full Seattle rules →Key Facts Comparison
| Fact | Kent | Seattle |
|---|---|---|
| Electrical permit | WA L and I | - |
| Building permit | Kent structural check | - |
| Fire pathway | IFC Ch 12 setbacks | - |
| Net metering | PSE under RCW 80.60 | - |
| Permit Type | - | Building permit plus electrical permit required |
| Expedited Review | - | Standard residential rooftop systems qualify for over-the-counter processing |
| Height Exemption | - | Panels within 4 feet of roof surface exempt from height limits |
| Lot Coverage | - | Solar panels excluded from lot coverage calculations |
| Net Metering | - | Available through Seattle City Light up to 100 kW |
Highlighted rows indicate differences between cities.
Kent FAQ
Do I need a permit to install Kent rooftop solar?
Yes, at minimum an L and I electrical permit and typically a Kent building permit for structural and fire review.
Can I DIY install solar?
A licensed electrical contractor must do the interconnection work; homeowners can install some structural components under permit.
Seattle FAQ
How long does it take to get a solar panel permit in Seattle?
Standard residential rooftop solar systems qualify for expedited over-the-counter permit review at SDCI, which can often be completed in a single visit. More complex installations such as ground-mounted arrays or commercial systems require standard plan review, which takes longer depending on current processing times.
Do solar panels affect my property's lot coverage or height limits?
No. Solar panels are excluded from lot coverage calculations, and panels that do not extend more than 4 feet above the roof surface are exempt from height limit calculations. This makes it easier to add solar to existing homes without triggering zoning issues.
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