Key Takeaways
- A full repipe in King or Pierce County typically costs $12,000–$25,000 for a 2,000 sq ft home, depending on material and access.
- PEX is the most common repipe material in the Seattle area due to cost, flexibility, and resistance to freeze damage.
- Galvanized steel pipes in 1940s–1970s homes often need replacement due to corrosion and low water pressure.
- Permits are required for repipes in both King and Pierce County and inspections are handled by local building departments.
- Expect a repipe to take 3–7 days, with water shutoff limited to part of each day if scheduled efficiently.
A whole-house repipe in King or Pierce County means replacing all the water supply pipes—usually because of old galvanized lines, chronic leaks, or low water pressure. Homeowners in Seattle, Maple Valley, Kent, and surrounding cities face this when repairs become constant or pipes are simply at end-of-life.
How do you know you need a repipe?
If you have galvanized steel pipes—common in homes built before 1975 in Seattle, Auburn, and Tukwila—chances are they're corroding inside. Signs include brown water, reduced flow at fixtures, and leaks at joints. Chronic pinhole leaks in copper (especially from the 1980s and early '90s) or visible corrosion are also red flags. Multiple leaks in a year or water pressure below 40 psi on city supply usually means it's time to replace, not repair.
What does a whole-house repipe actually involve?
The crew maps your existing lines and plans new routes, usually in PEX, copper, or sometimes CPVC. Old pipes are left in place unless they pose a hazard. Installers cut drywall at key access points—under sinks, behind tubs, in basements or crawlspaces. New pipes are run, pressure-tested, then the drywall is patched. For most 2,000 sq ft ramblers or craftsman houses, expect 3–7 working days onsite.
A well-planned repipe limits water shutoff to a few hours per day, so you can stay in your home throughout the job.
PEX vs copper vs CPVC: Which pipe material makes sense?
Your main choices in King and Pierce County are:
- PEX (cross-linked polyethylene): Flexible, freeze-resistant, and affordable. Most common for repipes since the late 2000s. Handles PNW's mild but occasionally freezing winters well. Cost: $12,000–$18,000 for a typical home.
- Copper: Durable and traditional. Still chosen for resale value or when local code requires. Costs 2–3x more than PEX—expect $20,000–$25,000+. Susceptible to pinhole leaks if your water is acidic or has high mineral content (rare in Seattle, but possible in well systems).
- CPVC: Rigid plastic, less common here. Slightly cheaper than copper but not as flexible as PEX. Used mostly in specific remodels or additions.
PEX is the default for most Seattle-area repipes. It bends around corners, requires fewer wall cuts, and is less likely to burst in a freeze. Copper works but costs much more and needs skilled soldering, which adds labor hours.
Comparison table: PEX vs Copper vs CPVC
| Pipe type | Installed cost* | Lifespan | Freeze resistance | Typical use |
|---|---|---|---|---|
| PEX | $12–18k | 40–50+ yrs | Excellent | 90%+ repipes |
| Copper | $20–25k+ | 50+ yrs | Poor | Historic homes |
| CPVC | $13–20k | 40+ yrs | Good | Select remodels |
*For a 2,000 sq ft single-family home in King/Pierce County, 2026 estimates.
How long does a repipe take?
Most jobs run 3–7 days onsite for a typical home. Larger or multi-story homes, or those with hard-to-access crawlspaces or finished basements, can take longer. Water will be off for a few hours each day, not the whole week. Good scheduling means you’ll have running water mornings and evenings. Add 2–3 days for drywall and paint repairs if needed.
What does a whole-house repipe cost in King & Pierce County?
For a standard 2,000 sq ft house, expect:
- PEX: $12,000–$18,000
- Copper: $20,000–$25,000+
- CPVC: $13,000–$20,000
Cost drivers:
- Number of bathrooms/kitchens (fixtures add labor and material)
- Crawlspace/basement access vs. slab foundation (slab = more work)
- Wall finish type (plaster, tile, or complicated drywall means more patching)
- Rerouting pipes for code or to avoid future freeze risks
Larger, multi-bath homes or those needing extra code upgrades (like new shutoffs or earthquake bracing) can go higher. Permits, inspection, and drywall are usually included in the estimate, but confirm with your plumber.
Permits, code, and inspections: What do local rules require?
A repipe triggers a plumbing permit in all King and Pierce County cities. Seattle, Kent, Bonney Lake, and others use the Washington State Plumbing Code (UPC). Inspections are handled by each city’s building department. Final drywall patching often gets a second look to check for leaks. A reputable plumber won’t skip permits—unpermitted work voids insurance and complicates resale.
When should you repipe instead of repair?
If you’ve had more than two pipe leaks in a year, or if your water pressure keeps dropping and you have visible corrosion, a full repipe is usually cheaper in the long run. Spot repairs on old galvanized or corroded copper just kick the can down the road. Repipe is a big job, but it ends the cycle of leaks, drywall mess, and emergency calls.
What to expect from the process
- Site walk and estimate: Plumber surveys your house, counts fixtures, checks access, and gives a written quote (should include drywall, permits, and inspection fees).
- Scheduling: Most crews can start within 2–4 weeks, barring supply chain hiccups.
- Execution: 3–7 days onsite, with water shutoff managed for your routine.
- Inspection: Local building department checks work before walls are closed.
- Cleanup and patch: Walls patched, paint matched as close as possible.
If you have questions about your specific home, Valor Plumbing at (425) 691-8064 can walk you through a site-specific estimate, with material choices tailored to your city and house type.
Frequently Asked Questions
How do I know if my house needs a repipe?
Signs include brown or rusty water, frequent leaks, low water pressure, and pipes made of galvanized steel or corroded copper. Multiple leaks in a year usually mean it's time to repipe.
Is PEX safe and approved for use in Washington homes?
Yes, PEX is approved under the Washington State Plumbing Code and is widely used in King and Pierce County for repipes and new construction.
Will I need to move out during a repipe?
Usually not. Most repipes are done with water shut off only a few hours per day, so you can stay in your home throughout the process.
How long will a whole-house repipe take?
Most repipes in average-sized homes take 3–7 days, plus a few extra days for drywall and paint repairs if needed.
Are permits required for a repipe in King or Pierce County?
Yes, plumbing permits are required for repipes in every city in King and Pierce County, and inspections are done by local building departments.
