Guides for Seattle Homeowners
Seattle has its own rules for sewers and plumbing. These guides summarize what the City and County say, with a link to every source.
Seattle Side Sewer Permits: What Homeowners Need to Know
Ownership, permits, fees, inspections and contractor rules, all in one place. Who owns your side sewer, when Seattle requires a permit, what SPU and SDOT permits cost, and who can do the work. Sourced from SPU, SDOT and city code.
Seattle’s Water Heater Permit Rule (July 2026)
Why a like-for-like water heater swap now needs a permit, and what happens if it’s skipped. From July 1, 2026, Seattle requires permits for all replacement water heaters. The phases, the fee for skipping it, and other permits that may apply.
Need a plumber in Magnolia or nearby Seattle?
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