Quick Answer: Whole-house repiping in the Bay Area costs $8,000–$20,000 for copper pipe or $4,000–$12,000 for PEX (cross-linked polyethylene) in a 1,500–2,500 SF home. PEX has become the dominant choice in Bay Area repipes because it is 30–40% less expensive than copper, highly flexible (fewer fittings, easier to run through walls), freeze-resistant (though freezes are rare in the Bay Area), and resistant to the corrosion that has plagued copper in high-pH Bay Area water. Signs you need repiping: pinhole leaks in copper pipe, discolored water (rust/orange), low water pressure throughout the home, and pipes over 40–50 years old (galvanized) or 50–70 years (early copper).
Repiping Cost — Copper vs. PEX Bay Area 2025
| Home Size | Copper (installed) | PEX (installed) |
|---|---|---|
| 800–1,200 SF (2 bath) | $8,000–$14,000 | $4,500–$8,000 |
| 1,200–2,000 SF (2–3 bath) | $12,000–$18,000 | $6,000–$12,000 |
| 2,000–3,000 SF (3–4 bath) | $16,000–$25,000 | $8,000–$16,000 |
Question: Why is copper pipe failing in Bay Area homes? Copper pipe failure — particularly pinhole leaks — is widespread in Bay Area homes built from the 1950s through 1990s. The primary cause is the chemistry of Bay Area water: San Francisco Bay Area municipal water supplies have low pH (slightly acidic) and high dissolved oxygen, which accelerates a form of copper corrosion called pitting corrosion. This creates pinhole leaks that typically first appear in hot water lines (hot water accelerates corrosion). The problem is most severe in San Jose, Fremont, and the East Bay where water has traditionally been harder and more corrosive. PEX pipe, which replaced copper as the industry standard in the 2000s, is immune to this corrosion mechanism. Quartz Construction specializes in Bay Area PEX repipes and has done hundreds of homes in the Bay Area.
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