Rewiring Older Homes in Ventura County, CA

Rewiring replaces some or all of a home's original wiring with modern, grounded wiring that meets current code. It's most common in homes built before the 1960s and in homes where an inspection, an insurer, or a remodel has turned up wiring problems.

What kinds of old wiring are common in Ventura County homes?

Knob-and-tube wiring, used in many homes built before roughly the 1940s, such as some older homes in Ventura, Santa Paula, Fillmore, Ojai, and Oxnard's oldest neighborhoods. It has no ground wire, and its insulation may have deteriorated or been buried in attic insulation.
Cloth-insulated cable from the mid-century era, which can become brittle.
Ungrounded two-prong outlets, sometimes swapped for three-prong outlets without a ground behind them.
Aluminum branch-circuit wiring, used in some homes built roughly from the mid-1960s to the early 1970s. Connections can loosen and overheat if not handled properly. Repair methods exist that don't require a full rewire.
Do-it-yourself additions by previous owners, like splices without boxes or undersized wire.

What are the warning signs?

Breakers or fuses that trip or blow often.
Warm or discolored outlets and switches.
Flickering lights that aren't explained by a bulb.
Two-prong outlets throughout the house.
Few outlets per room and lots of extension cords.
Burning smells. If strong, or if you see smoke, leave and call 911.

Why rewire?

Old wiring isn't automatically dangerous, but it was designed for far smaller loads than modern homes use, it lacks grounding for shock protection, and it may have been damaged or modified over decades. Some insurers ask about knob-and-tube or older panels before writing or renewing a policy. A rewire also makes it easier to add modern protection like GFCI and AFCI devices where required.

What does a rewire involve?

Evaluation: the electrician surveys the panel, circuits, attic, crawlspace, and devices.
Plan and permit: scope (full or partial), new circuits, and the permit from your city or the County of Ventura.
Running new wire, often through the attic and crawlspace to reduce wall openings. Plaster walls in older homes take more care.
New devices: grounded outlets, switches, and boxes, with GFCI and AFCI protection where required.
Inspection, then wall patching, which may be by the electrician or a separate trade.

Many families stay in the home during a rewire, with power off in parts of the house at times. Ask about the schedule.

Older materials

Homes built before 1978 may have lead-based paint, and older homes may have asbestos in some plaster, ceiling textures, and insulation. Ask the electrician how they'll handle cutting into walls and ceilings, and whether testing is needed first.

Partial rewiring

A full rewire isn't always necessary. Kitchens, bathrooms, and laundry areas often get rewired first because they carry heavy loads and need GFCI protection. A planned remodel is a good time to rewire the affected rooms. See ADU and remodel wiring.

How do I prepare for a rewire?

Clear access to the attic hatch, crawlspace entrance, and panel. Move furniture away from walls where outlets will be replaced, and protect valuables from dust. Ask the electrician which rooms will be without power and when, and plan for refrigerators, medical devices, and work-from-home equipment. If you have pets, plan where they'll stay. Finally, ask for an updated panel directory when the work is complete, so every breaker is labeled with what it actually controls. That directory is valuable in any future emergency or repair.

Hiring tips

Check the contractor's license at cslb.ca.gov, ask for proof of liability insurance and workers' compensation, and get a written scope listing circuits, devices, permit, and patching. See also panel upgrades and safety inspections.

Frequently asked questions

Is knob-and-tube wiring illegal?

Existing knob-and-tube wiring isn't automatically illegal, but it lacks a ground, can be damaged with age, and isn't suitable to bury in insulation. Some insurers restrict coverage. An electrician can evaluate its condition.

Can I just replace two-prong outlets with three-prong ones?

Not safely without a ground or proper protection. Code allows certain options, like GFCI protection, but labeling and methods matter. Have an electrician do it.

Do I have to move out during a rewire?

Often not. Many rewires are done room by room. Ask the electrician about the schedule and how long power will be off in each area.

Rewiring Older Homes help around Ventura County

We take requests from 24 nearby communities. Local guides:

Back to Ventura County Electrician Pros

Rewiring Older Homes in Ventura County