Knob-and-Tube Wiring Replacement · Los Angeles, CA
Knob-and-Tube Wiring Replacement in Los Angeles, CA
Knob-and-tube replacement removes early wiring (about 1880s to 1940s) that runs on ceramic knobs and tubes without a ground, and replaces it with modern grounded cable. It is commonly done before insulating, during renovations, or when an insurer requires it.
- Call now to check electrician availability in your area
- Independent, licensed electricians
- Serving Downtown, Silver Lake, Westchester and more
Why knob-and-tube wiring replacement comes up in Los Angeles
Craftsman bungalows in Highland Park, Eagle Rock and West Adams and Spanish Revival homes in Los Feliz and Silver Lake were often wired with knob-and-tube in the 1910s and 1920s, and much of it is still live, buried under decades of attic insulation that it was never designed for. Insurers and buyers often flag it during inspections. Raised foundations make the crawl space the main route for new circuits, with the attic covering ceiling lights.
Historic Preservation Overlay Zones review visible exterior changes. The work is permitted through LADBS, and LADWP coordinates any service upgrade.
- Craftsman bungalows and Spanish Revival homes from the 1910s to the 1930s fill neighborhoods such as Highland Park, Silver Lake, Los Feliz and West Adams, and many still carry knob-and-tube or ungrounded wiring hidden behind plaster.
- Common problems include Zinsco or Federal Pacific breakers that overheat, aluminum branch wiring in late-1960s homes, and Craftsman bungalows with knob-and-tube spliced into newer circuits.
- Permits in Los Angeles
- In the City of Los Angeles, electrical permits are issued by LADBS. Other cities in the county, and unincorporated areas, have their own building departments.
- Electric utility
- LADWP (city of Los Angeles)
Signs to look for
- Ceramic knobs and tubes visible in the attic or basement
- Two-prong outlets throughout the house
- An insulation contractor or energy program requiring an assessment
- An insurer asking about wiring type
- Fuses or a small service alongside old wiring
How the work is done
1. Trace active circuits
The electrician identifies which knob-and-tube runs are still live and where they go.
2. Plan the routes
New cable routes are planned through attics, basements and walls to minimize openings.
3. Install new circuits
Grounded cable, boxes and devices are installed and the old wiring is disconnected.
4. Inspect and patch
Rough-in and final inspections are completed, and access holes are patched.
What moves the price in Los Angeles
Electricians set their own prices. Electrification is the biggest driver of panel work in LA: heat pumps, induction cooking, EV chargers and rooftop solar often all land on a panel that dates to the original build.
- How much knob-and-tube is still active
- Plaster versus drywall walls
- Attic and basement access
- Number of floors
- Panel upgrade at the same time
- Wall patching and painting
Knob-and-Tube Wiring Replacement in Los Angeles: questions
Do I need a permit for knob-and-tube wiring replacement in Los Angeles?
Usually, yes. In the City of Los Angeles, electrical permits are issued by LADBS. Other cities in the county, and unincorporated areas, have their own building departments. The electrician normally pulls the permit and schedules the inspection.
Is the utility involved in Los Angeles?
If the work affects the meter or service, the electrician coordinates with LADWP (city of Los Angeles), which owns the meter and service drop.
Is knob-and-tube wiring illegal?
Existing knob-and-tube is generally not illegal, but it cannot be extended, and many insurers and lenders treat it as a reason to replace.
Can knob-and-tube be insulated over?
It is not recommended, and many codes and insulation programs prohibit it, because the wiring relies on open air to cool.
How do I know if mine is still live?
An electrician can test it. Many homes have a mix of active and abandoned knob-and-tube.
How long does replacement take?
From a few days for a small home with good access to a few weeks for larger plaster-walled homes.
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