Key Takeaways
- Galvanized pipes in older homes often need replacement after 50+ years due to corrosion and leaks.
- PEX, copper, and CPVC are the main repipe materials; each has distinct pros, cons, and costs.
- A whole-house repipe in King or Pierce County typically costs $10,000–$22,000 for a standard 2-bath home.
- Permits and code compliance are required for repipes; expect 4–8 days of work, plus inspection time.
- Rusty water, low pressure, and recurring leaks are key signs your piping system is failing.
If your King or Pierce County home has rusty water, chronic leaks, or uneven water pressure, chances are your pipes are failing. Most 1970s ramblers and older Seattle Craftsmans still have some original galvanized steel or copper piping, which means corrosion and hidden leaks are common. A whole-house repipe replaces all water-supply lines and solves these problems for good.
What are the warning signs you need a repipe?
The big red flags for failing pipes in the Seattle-Tacoma area are:
- Rusty or brown tap water, especially after the water sits overnight
- Chronic pinhole leaks or visible corrosion on pipes
- Noticeable drop in water pressure (especially when multiple fixtures run)
- Old galvanized or thin-walled copper piping (common in homes built before 1980)
- Frequent slab or wall leaks
If you’re calling for leak repairs more than once every couple years, or you see rust stains in sinks and tubs, it’s time to consider a full repipe. Temporary repairs won’t solve systemic corrosion.
How do PEX, copper, and CPVC compare for whole-house repipes?
The main choices for repiping in King and Pierce County are PEX (cross-linked polyethylene), copper, and CPVC (chlorinated polyvinyl chloride). Each has pros and cons:
| Material | Pros | Cons | Typical Cost (2-bath house) |
|---|---|---|---|
| PEX | Flexible, fast install, freeze-resistant, least expensive | Not sunlight-friendly, fittings can fail if poor quality | $10,000–$14,000 |
| Copper | Long lifespan, high water quality, time-tested | Expensive, slow install, can corrode with hard water | $16,000–$22,000 |
| CPVC | Low material cost, easy to work with | Brittle over time, rare in WA, not for outdoor use | $11,000–$15,000 |
Most newer Maple Valley and Bonney Lake homes use PEX for its speed of install and freeze resilience, but copper remains common in high-end or historic renovations.
What does a whole-house repipe actually involve?
A repipe means replacing all incoming water lines—from where they enter the home up to every faucet, toilet, and shower. The process typically follows these steps:
- Shut down and drain the existing system
- Access walls, crawlspaces, or ceilings as needed
- Remove old galvanized, copper, or CPVC piping
- Install new PEX, copper, or CPVC runs to every fixture
- Patch drywall and repair tile or finishes as needed
- Pressure-test the new system
- Arrange for city inspection (required in most King/Pierce County cities)
In a standard 2-bath single-family home, the job takes 4–8 days, not including patching. Multi-story or large homes add time and cost.
How much does a repipe cost in King and Pierce County?
For most homes in the Seattle-Kent-Tukwila corridor, a whole-house PEX repipe runs $10,000–$14,000. Copper can cost $16,000–$22,000 or more due to material and labor. CPVC is rarely used but falls in between.
Variables that move the price up:
- Number of bathrooms and fixtures
- 2-story vs. rambler layout (multi-story is more work)
- Plaster, tile, or custom wall finishes (patching is pricier)
- Accessibility of crawlspace or basement
Most King and Pierce County cities, including Seattle, require a plumbing permit and inspection for repipes. Permit fees add $250–$600, depending on the city.
When is a spot repair enough—and when is it time to repipe?
If you’ve had one isolated leak in otherwise healthy copper or PEX, a spot repair is fine. But with galvanized lines, or if you’ve had two or more leaks in a year, repiping saves money in the long run. Repeated leaks mean underlying corrosion is widespread, not just a fluke.
A rule of thumb: if your line breaks in multiple places—or if you see water discoloration and pressure loss—patching is just buying time. Repiping brings the system up to modern code and eliminates recurring repair costs.
What code and permit requirements apply?
The Washington State Plumbing Code (based on UPC) governs repipes. King and Pierce County cities require a plumbing permit before starting, and most want a pressure test and on-site inspection before you can close up any walls.
- Plan for at least one inspection during the job
- Permit fees vary by city and home size
- Some older Seattle homes may need additional upgrades (like adding shutoffs or pressure regulators)
Unpermitted work can cause headaches during resale and can even void insurance claims if there’s a leak down the road.
How to prepare your home (and your family) for a repipe
You’ll lose water service for at least part of the repipe. Prepare by:
- Filling buckets for toilet flushing
- Stocking drinking water
- Securing pets away from open walls/crawlspaces
- Removing items from under sinks and clearing work areas
Most reputable plumbers (including Valor Plumbing) patch drywall roughly, but you may want to budget for a painter or tile pro for specialized finishes.
Choosing a plumber for your repipe project
Look for a plumber licensed in Washington with solid reviews and proof of insurance. Experience with local code, especially in older Seattle or Tacoma homes, is essential. BBB accreditation is a plus.
Valor Plumbing, for example, is licensed, insured, and A-rated with the BBB. The same team does the work—no farmed-out crews. You can call (425) 691-8064 to discuss your project or get a ballpark estimate.
Next steps if you think you need a repipe
Get a pipe inspection (video or physical) and a written estimate. Ask if the quote includes permits, wall patching, and fixture reconnection. Compare PEX and copper costs for your specific layout. Don’t wait for a major leak—replacing aging pipes before failure is always cheaper than emergency water mitigation.
Frequently Asked Questions
How long does a whole-house repipe take?
Most repipes in King and Pierce County take 4–8 days for a typical 2-bath house, plus extra time for patching and inspection.
Should I choose PEX or copper for my home's repipe?
PEX is usually less expensive and more freeze-resistant, while copper lasts longer but costs more. Both are code-compliant in Washington.
Do I need a permit for a repipe in Seattle or Tacoma?
Yes, all cities in King and Pierce County require plumbing permits and inspections for whole-house repipes.
How much does a whole-house repipe cost in King or Pierce County?
A PEX repipe usually costs $10,000–$14,000 for a standard 2-bath home. Copper runs $16,000–$22,000 or more depending on size and finishes.
Can I stay in my house during a repipe?
Yes, most families stay home during a repipe, though you’ll be without water for parts of the process and should prepare accordingly.