Wiring doesn’t last forever. In older homes especially, aging or outdated wiring is one of the most overlooked electrical issues. Knowing the warning signs helps you decide what actually needs work. MDBC Electric does partial and whole-home rewires in Ventura and Santa Barbara counties (CSLB #1158234).
Signs Your Home May Need Rewiring
- Knob-and-tube or aluminum wiring (common in homes built before the 1970s)
- Two-prong (ungrounded) outlets throughout the house
- Outlets or switch plates that feel warm or look discolored
- Frequent breaker trips, or a burning smell near outlets
- Cloth-insulated wiring or a home that hasn’t been updated in 40+ years
A single warm outlet can be a local repair. A house full of two-prong receptacles, cloth NM, or knob-and-tube is a different project. We inspect before we recommend a full rewire. Related: home electrical safety and small repairs & troubleshooting.
Why It Matters
Deteriorated insulation, loose connections, and undersized circuits are common fire-investigation findings. Modern cable is grounded and sized for today’s loads. Insurers and buyers often ask about knob-and-tube, ungrounded outlets, and aluminum branch circuits. We do not quote insurance underwriting rules; we can tell you what is in the walls and what a permitted update looks like.
Rewiring is also how kitchens, bathrooms, and home offices get dedicated circuits instead of sharing one 15A run across half the house. Lighting upgrades and EV circuits assume the branch wiring can take them. See lighting & LED upgrades and EV charger guide.
What a Rewire Involves
We start with an inspection and a plan, then access the walls and ceilings as needed (working carefully to limit the mess), run new wiring, update outlets and grounding, and bring everything to current code. Rewires can be whole-home or partial — targeting just the circuits that need it. Every job ends with a permit inspection.
Service page: whole-home rewiring. Panel work that often travels with a rewire: electrical panel upgrades and panels explained.
What to Expect
Timelines depend on the size of the home and how much access is needed, but we keep disruption to a minimum, protect your floors and furnishings, and leave the space clean. You’ll know the plan and the schedule before we start.
Power is typically off in sections rather than the whole house for weeks. You will still live with some open plates, attic trips, and drywall patches. Patching and paint are usually coordinated with your painter or general contractor unless we agree otherwise in writing.
Knob-and-tube, cloth NM, and aluminum
Knob-and-tube
Common in early 20th-century houses. Individual hot and neutral run on porcelain knobs. It is ungrounded, often modified over decades, and frequently buried under insulation (which it was never designed for). Replacement of the remaining K&T is the usual recommendation when we find it in use.
Cloth-insulated NM
Mid-century cable with fabric jacket. The copper inside may still be fine while the jacket is brittle. We judge by condition, splices, and load — not by year alone.
Aluminum branch circuits
Some 1960s–70s homes used aluminum for 15A and 20A circuits. Connections need the right devices (CO/ALR) or, more often, a plan to replace those runs. This is different from aluminum service entrance cable, which is still used at the meter and is not the same issue.
Partial vs. whole-home
Partial rewire makes sense when one area is being opened anyway (kitchen, bathroom, addition) or when only certain circuits are failing. Whole-home makes sense when most rooms share the same outdated wiring, you are already in a renovation, or an insurer or sale requires it. We will not sell a whole-house job if a kitchen and bath plus a panel will solve what you actually asked for.
Ungrounded two-prong outlets can sometimes be replaced with GFCI-protected receptacles labeled “no equipment ground” where code allows — that is a safety improvement, not a full rewire. True three-prong grounded outlets require a ground path. See outlets, switches & surge protection.
Access, mess, and living in the house
Attics, crawlspaces, and closets are the usual highways. Finished plaster or drywall may need cut-ins at outlets and switches. Historic trim and lath-and-plaster take more care and more time. We plastic off work areas and clean up daily; we cannot promise zero dust on a rewire.
If you are already remodeling, the cheapest time to rewire is when walls are open. Call us before the drywall goes back up.
Permits, inspections, and the panel
Rewires are permitted. Inspectors will look at boxes, cable support, grounding, AFCI/GFCI, and smoke-alarm circuits as required by the adopted code. The panel often needs new breakers, more spaces, or a full replacement so new homeruns have a legal landing. Permits overview: permits & inspections. Capacity: Do I need a 200A service?
Questions about old wiring? Call (805) 627-4697 or email warning signs.
Is aluminum wiring always a full rewire?
Not always. It depends on how much is aluminum, the condition of terminations, and what you are trying to accomplish. We inspect and then give you options.
Do you pull the permit?
Yes. Rewiring is not a no-permit job in our cities and counties.