Cost to Repipe a House in Washington: $5,000–$9,100
In Washington, a PEX repipe of a house with 2 full baths and 11 fixtures costs an estimated $5,000–$9,100, and copper runs $10,100–$14,700. The estimate is based on national published prices scaled by plumber wages in Washington, plus one local plumbing permit fee. A fixture is anything a supply line feeds: a toilet, sink, tub, shower, dishwasher, washing machine or hose bib.1,
This site found fewer than two plumbing companies in Washington that publish a repipe price, so the Washington figures are national prices scaled by the state's mean plumber wage.
Key figures for Washington
| Item | Figure |
|---|---|
| PEX repipe estimate (midpoint $7,100, a house with 2 full baths and 11 fixtures) | $5,000–$9,1001, |
| Copper repipe estimate (midpoint $12,400, same house) | $10,100–$14,7001, |
| PEX, per fixture (national prices scaled by state wage) | $440–$8101, |
| Plumbing permit example (Public Health - Seattle & King County) | $191–$21810 |
| Mean plumber wage (US mean $34.70/hr, May 2025) | $42.69/hr1 |
| Median year built (housing units, ACS 2024 1-year) | 198711 |
Estimate a repipe in Washington
Estimate: $5,000–$9,100, midpoint $7,100, for 11 fixtures.1,
| Line item | Low | High |
|---|---|---|
| Repipe, installed (pipe, fittings and labor)national prices scaled by Washington plumber wages | $4,840 | $8,9101 |
| Plumbing permitpermit fees published in Washington | $191 | $21810 |
| Total (rounded) | $5,000 | $9,100 |
Supply lines only. Wall and ceiling patching is not a line here, and some published prices leave it out, so ask whether a quote includes it.
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Repipe cost in Washington by number of bathrooms
| House | Fixtures | PEX | Copper |
|---|---|---|---|
| 1 bath | 8 | $3,700–$6,700 | $7,400–$10,800 |
| 1.5 baths | 10 | $4,600–$8,300 | $9,200–$13,400 |
| 2 baths | 11 | $5,000–$9,100 | $10,100–$14,700 |
| 2.5 baths | 13 | $5,900–$10,700 | $11,900–$17,400 |
| 3 baths | 14 | $6,400–$11,600 | $12,800–$18,700 |
| 4 baths | 17 | $7,700–$14,000 | $15,500–$22,700 |
Each full bath adds three fixtures (toilet, sink, and tub or shower) and each half bath adds two. Each row is the Washington estimate for that house size, permit included.
Where the money goes on a Washington repipe
| Line item | Low | High | Basis |
|---|---|---|---|
| Repipe, installed (pipe, fittings and labor) | $4,840 | $8,910 | national prices scaled by state plumber wages |
| Plumbing permit | $191 | $218 | published in this state |
| Total, rounded to $100 | $5,000 | $9,100 |
How Washington compares
The mean hourly wage for plumbers in Washington is $42.69, 23% above the US mean of $34.70. Because Washington uses national prices scaled by that wage, its estimate moves with it. None of the states bordering Washington has a page here yet, so the table compares it with the national estimate only.
| Area | Estimate | Midpoint | Plumber wage |
|---|---|---|---|
| Washington | $5,000–$9,100 | $7,100 | $42.69 |
| United States | $4,000–$7,500 | $5,800 | $34.70 |
Permits and licensing in Washington
Washington's Department of Labor and Industries certifies plumbers. Only a certified plumber may do plumbing work on someone else's property. Certificates cover journey-level plumbers and residential specialty plumbers, along with narrower specialties and trainees. You can check a plumber's license on the state license search. In Seattle and unincorporated King County, Public Health - Seattle & King County issues plumbing permits. For a repipe it asks applicants to list only representative repipe lines (hot water, cold water and drainage) plus any fixture whose in-wall plumbing changes, not every fixture in the house. Ask your building department how it prices a whole-house repipe.
- Public Health - Seattle & King County: Plumbing/Backflow Permit: $137 plus $27 per fixture; for re-pipe projects, only 're-pipe' representative fixtures (hot water, cold water and/or drainage) plus incidental fixtures needing in-wall work are listed. For a house with 2 full baths and 11 fixtures, that comes to $191–$218.
Public Health - Seattle & King County lets a homeowner who does the work pull the repipe permit.
Plumbing code in Washington
Washington adopts the 2021 Uniform Plumbing Code with state amendments in WAC 51-56. Your city or county can add local amendments, so the building department that issues the permit has the final word.
Sources17
Age of Washington's housing
Half of the housing units in Washington were built before 1987, by the Census Bureau's ACS 2024 1-year count. 19% were built before 1960, when galvanized supply pipe was common. 26% were built from 1980 to 1999, the two Census decades that overlap the years polybutylene pipe was made. Age alone does not tell you what pipe a house has; a plumber or inspector can.
Published prices in Washington
| Published by | Where | Material | Price | Covers |
|---|---|---|---|---|
| Action Craft Experts | Spokane, WA | PEX | $250–$8009 | per fixture |
One plumbing company in Washington publishes a repipe price. This site uses a state's own prices once two or more of its plumbing companies publish them, so this price is shown as published and does not set the Washington estimate.
Sources9
Common questions
Do you need a permit to repipe a house in Washington?
In Seattle and unincorporated King County, Public Health - Seattle & King County issues plumbing permits. For a repipe it asks applicants to list only representative repipe lines (hot water, cold water and drainage) plus any fixture whose in-wall plumbing changes, not every fixture in the house. Ask your building department how it prices a whole-house repipe. Under the fee schedule from Public Health - Seattle & King County, the fee for a house with 2 full baths and 11 fixtures comes to $191–$218.
Who licenses plumbers in Washington?
Washington's Department of Labor and Industries certifies plumbers. Only a certified plumber may do plumbing work on someone else's property. Its license lookup shows whether a plumber's license is current.
How much more does copper cost than PEX in Washington?
For a house with 2 full baths and 11 fixtures, PEX is estimated at $5,000–$9,100 and copper at $10,100–$14,700, a difference of about $5,300 at the midpoint. Per fixture, the Washington figures are $440–$810 for PEX and $900–$1,320 for copper.
How was the Washington estimate made?
The national per-fixture prices plumbers publish were multiplied by 1.230, the ratio of the Washington mean plumber wage to the US mean. That price times the fixture count, plus the permit fee from Public Health - Seattle & King County, gives the range. The methodology explains each step.
For every state side by side and the national figures, see costtorepipeahouse.com.
Sources
- Occupational Employment and Wages, May 2025: 47-2152 Plumbers, Pipefitters, and Steamfitters (state estimates), U.S. Bureau of Labor Statistics. Accessed November 10, 2026. Mean hourly wage for each state and for the US, from the BLS public data API (series OEUS{state FIPS code}00000000000047215203 for a state, OEUN000000000000047215203 for the US).
- How Much Does It Cost to Repipe My Home?, The Repipe Company. Accessed November 10, 2026.
- How Much Does It Cost to Replumb a 1,500 Square Foot House in 2026?, Repipe Solutions Inc. Accessed November 10, 2026.
- PEX vs Copper Piping: Which Is Better?, Kimco Plumbing & Air. Accessed November 10, 2026.
- PEX vs Copper, Repipe1. Accessed November 10, 2026.
- Copper Repipe vs PEX: Which Is Better for Your Home?, All Pro Repipes Inc. Accessed November 10, 2026.
- Whole-Home Repiping Pricing, Home Therapist Cooling, Heating, and Plumbing. Accessed November 10, 2026.
- Cost to Repipe a House in Florida: 2026 Pricing and Homeowner Guide, Alberto Pro Plumbing. Accessed November 10, 2026.
- Average Cost to Repipe a House with PEX, Action Craft Experts. Accessed November 10, 2026.
- Plumbing and Gas Piping Program fees, Effective January 1, 2026, Public Health - Seattle & King County, Community Environmental Health. Accessed November 10, 2026. Effective January 1, 2026.
- American Community Survey 2024 1-year, tables B25034 (Year Structure Built) and B25035 (Median Year Structure Built), U.S. Census Bureau. Accessed November 10, 2026. State rows of the summary files acsdt1y2024-b25034.dat and acsdt1y2024-b25035.dat.
- Construction Permit Fees, Effective October 1, 2026 (PG_012_INF Rev 7.2026), City of Philadelphia Department of Licenses and Inspections. Accessed November 10, 2026.
- 2026 Combined Development Related Fee Schedule, City of Columbus Building and Zoning Services. Accessed November 10, 2026.
- About the Plumber Program, Washington State Department of Labor & Industries. Accessed November 10, 2026.
- WAC 296-400A-010 Plumbing certificate types and scope of work, Washington State Legislature. Accessed November 10, 2026.
- Plumbing Permit Application Process for Re-Pipe Projects (Last Updated: 12/30/2024), Public Health - Seattle & King County. Accessed November 10, 2026.
- WAC 51-56-003 Uniform Plumbing Code, Washington State Legislature. Accessed November 10, 2026.
- Galvanized Iron Pipes, East Bay Municipal Utility District. Accessed November 10, 2026.
- Polybutylene Pipes, InterNACHI (International Association of Certified Home Inspectors). Accessed November 10, 2026. Source for the 1978 to mid-1995 production years and the 'up to 10 million homes' figure.
How these figures are built: methodology. Updated November 2026.