Whole House Repipe Cost in Seattle 2026
Whole House Repipe in Seattle costs between $5,650 and $21,187 in 2026, with the average around $11,300. Seattle pricing runs 41% above the US national average. Replacement of all supply water lines throughout the home with new PEX or copper piping, new shutoff valves, and fixture connections. Includes wall access, patching, and pressure testing.
What whole house repipe includes in Seattle
Replacement of all supply water lines throughout the home with new PEX or copper piping, new shutoff valves, and fixture connections. Includes wall access, patching, and pressure testing.
Typical time on site: 2 to 4 days. Local labor rate: $41/hour for an experienced plumbing pro.
What changes the price of whole house repipe in Seattle
- PEX versus copper
- Number of bathrooms
- Home size and stories
- Wall access and drywall repair
- Slab or crawlspace routing
A whole house repipe quote priced off statewide averages will be off by 10 to 20 percent for Seattle, because the metro has its own labor pool, material delivery distances, and permit timelines.
Seattle climate and demand for plumbing
Mild winters with persistent rain (moss/moisture on roofs); rare snow loads; minimal AC historically but warming trend
Seattle permits for whole house repipe
Building department: Seattle Department of Construction and Inspections (SDCI). https://www.seattle.gov/sdci
Typical permit cost: $400 - $5,000 residential. Inspection time: 10-25 business days; plan check 6-12 weeks. Seattle rule: Seattle SDCI has strict energy code (Stretch Code). Tree ordinance affects site work. ADU streamlined permitting. WA L&I license required for all contractors.
Washington sales tax and licensing for Plumbing
Washington sales tax: 6.5% + local (~9.3% combined avg) + 0.471% B&O. WASHINGTON TAXES CONTRACTOR LABOR. Retail Sales Tax applies to total construction contract (labor + materials) on speculative builders. Custom construction taxed differently.
State license: Washington Department of Labor and Industries (L&I), required: $117 (initial) + $12K bond + insurance.
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