Plumbing in Seattle

Galvanized supply lines in Capitol Hill bungalows don't fail all at once — they narrow slowly, cutting pressure until a Kohler shower valve can barely push enough flow for a decent shower. Seattle's core neighborhoods run heavy on pre-1960 housing stock, which puts galvanized-to-PEX retrofits on nearly every full bathroom or kitchen remodel we run. TopVolk handles rough-in plumbing as part of the full project scope, permitted through Seattle SDCI. WA Licensed Contractor, 100+ projects completed since 2017 across King County.

Zip codes 98102 and 98112 — Capitol Hill and Madison Park — are packed with 1910–1930 Craftsman bungalows that have never had supply lines touched since original construction. Wallingford and Fremont (98103) layer in post-war ranchers from the late 1940s and early 1950s, with original galvanized drain lines that corrode from the inside out over decades of Seattle's mineral-heavy city water. Those same Wallingford homes often run 2-inch cast iron vents that are partially blocked at the stack — slow drains in the kitchen and bath on the same wall is usually the tell. Seattle's 37 inches of annual rainfall keeps crawlspace moisture an ongoing concern; vapor barrier replacement is frequently added to scope once we open walls on a full plumbing rough-in. King County DPER requires permits for water heater replacements and any supply line rerouting — factor 3–5 weeks for plan review when scheduling your project start.