Wondering whether your older Bay Area home needs a rewire? Short answer: whole-house rewiring typically costs $8,000–$20,000+ and becomes necessary when a home still has knob-and-tube, cloth-insulated, or aluminum branch wiring, or when you're seeing repeated electrical problems. It's disruptive but, on a pre-1970s house, it's often the difference between a safe home and a hidden fire risk. Here's how to tell if you're due — and what the job actually involves.
Pacific Edge Electric and Solar is a licensed C-10 electrical contractor (CA #1143455) in Los Gatos. We rewire older homes across the South Bay and Peninsula — the pre-1970 housing stock in places like Palo Alto, Willow Glen, and downtown San Jose — so this is grounded in real jobs.
Signs your home may need rewiring
- Knob-and-tube wiring. Common in homes built before ~1950; it has no ground and gets brittle with age.
- Cloth-insulated or fabric wiring. The insulation degrades and crumbles over decades.
- Aluminum branch wiring (1960s–70s). Prone to loose, overheating connections at outlets and switches.
- Two-prong outlets everywhere. A sign of an ungrounded system.
- Recurring symptoms: breakers that trip often, warm or discolored outlets, a burning smell, flickering lights, or shocks from switches.
- Insurance trouble. Some insurers won't cover (or will surcharge) homes with knob-and-tube or aluminum wiring.
If several of these ring true, get an evaluation before adding any major loads.
What whole-house rewiring costs
| Home size / scope | Typical installed cost |
|---|---|
| Smaller home / partial rewire | $8,000–$12,000 |
| Average single-family full rewire | $12,000–$20,000 |
| Larger or complex home (plaster walls, multiple stories) | $20,000–$35,000+ |
Cost drivers are square footage, number of circuits, wall construction (plaster is harder to fish than drywall), accessibility, and whether the panel is upgraded at the same time. See our transparent pricing for context.
What the job involves
A rewire replaces the old branch wiring throughout the house with modern copper wiring, new outlets and switches, proper grounding, and current safety devices (AFCI/GFCI protection where required). It's usually paired with a panel upgrade so the new wiring lands on a modern service. Electricians fish new wire through walls, ceilings, and floors with as little demolition as possible, but expect some access holes that get patched. On an occupied home it's typically staged room-by-room to keep power available.
Why it's not a DIY or handyman job
Rewiring is permitted, inspected work for good reason — it touches every circuit in the house and any mistake is hidden inside a wall. A licensed C-10 contractor pulls the permit, brings the whole house to current code, and gets it inspected, which also protects you at resale and with your insurer. Because we also do solar, battery, and EV work, a rewire is the perfect time to add the circuits and panel capacity for whatever's next.
Not sure if you need a full rewire?
Sometimes the answer is a targeted repair or a panel upgrade rather than a full rewire — and an honest electrician will tell you that. We evaluate what you actually have and recommend the least-invasive fix that makes the home safe. Explore our electrical services or request a free assessment.
Frequently asked questions
How much does it cost to rewire a house in the Bay Area?
A full single-family rewire typically runs $12,000–$20,000, with smaller or partial jobs from $8,000 and larger/complex homes $20,000–$35,000+. Wall construction, home size, and a simultaneous panel upgrade drive the number.
How do I know if my house needs rewiring?
Red flags include knob-and-tube, cloth-insulated, or aluminum branch wiring, widespread two-prong outlets, frequent breaker trips, warm or discolored outlets, burning smells, and insurance that won't cover the existing wiring. A licensed electrician can confirm with an evaluation.
Do I have to move out during a rewire?
Usually not. Rewires are typically staged room-by-room so the home stays powered and livable, though it is dusty and disruptive while it's underway. Timeline depends on home size and wall access.
Is a permit required to rewire a home?
Yes. Rewiring is permitted work with inspections, and it should bring the home to current code. Always use a licensed C-10 contractor — unpermitted rewiring is a serious safety and resale liability.
Ranges are typical Bay Area planning figures; your exact cost is quoted in writing after an on-site evaluation. Written by Adam Aksoy, licensed C-10 electrical contractor (CA #1143455), Pacific Edge Electric and Solar.