Quick Answer: Whole-house rewiring in the Bay Area costs $8,000–$25,000 for a 1,500–2,500 SF home, with most projects falling in the $12,000–$18,000 range. Cost factors include: home size, number of circuits, whether walls need to be opened (full gut rewire vs. “fish-through” method), and local permit fees. Bay Area homes with knob-and-tube wiring (pre-1940s) or aluminum wiring (1960s–1970s) should be rewired — insurance companies in California increasingly refuse coverage for knob-and-tube homes or charge 30–50% higher premiums. Rewiring during a full renovation is the most cost-effective time since walls are already open.
Bay Area Rewiring Cost by Home Size — 2025
| Home Size | Cost Range | Circuits Added |
|---|---|---|
| 800–1,200 SF | $6,000–$14,000 | 15–25 circuits |
| 1,200–1,800 SF | $10,000–$18,000 | 25–35 circuits |
| 1,800–2,500 SF | $14,000–$25,000 | 35–50 circuits |
| 2,500–3,500 SF | $20,000–$35,000 | 50–70 circuits |
Question: How do I know if my Bay Area home has knob and tube wiring? Knob-and-tube (K&T) wiring is found in homes built before 1940 and some early 1950s construction. To identify it: look in your attic or basement/crawl space for white ceramic knobs attached to framing lumber with wires threaded through them, and white ceramic tubes protecting wires where they pass through framing. K&T wiring is ungrounded (two conductors, no ground wire), which means modern three-prong outlets can’t be safely used without GFCI protection. It also cannot legally be covered with insulation under current California code. If you are buying an older Bay Area home (pre-1950), have an electrician inspect for K&T before closing — rewiring a 1,000 SF bungalow costs $6,000–$12,000 and should be negotiated into the purchase price.
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