Knob-and-Tube Wiring Replacement · South Carolina

Knob-and-Tube Wiring Replacement in South Carolina

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.

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Local notes for 3 South Carolina cities

An electrician running new wiring through open wall studs

Knob-and-Tube Wiring Replacement across South Carolina

Knob-and-Tube Wiring Replacement in Charleston, SC

Charleston's single houses and townhouses south of Broad, in Ansonborough and Harleston Village, and the early-1900s bungalows of Wagener Terrace and Hampton Park often still carry knob-and-tube wiring. Humidity, termites and periodic flooding are hard on old insulation.

Historic homes may have wiring from many eras, and the city's Board of Architectural Review regulates visible exterior changes. Low-lying neighborhoods flood from storms and king tides, so elevating panels, meters and AC equipment is common.

Knob-and-Tube Wiring Replacement in Columbia, SC

Shandon, Elmwood Park, Earlewood and Cottontown hold many of Columbia's homes from the 1900s to the 1940s, and knob-and-tube wiring still turns up in some of their attics and crawl spaces. Homes repaired after the October 2015 flood may have new wiring low on the walls and old wiring above.

Older homes may have original wiring and small panels, and air conditioning runs hard for months, stressing older circuits. Homes in low-lying areas near creeks can face flood risk to panels and outlets.

Knob-and-Tube Wiring Replacement in Greenville, SC

Greenville's old mill villages, built for textile workers in the early 1900s, and the larger homes of North Main and Overbrook sometimes still have knob-and-tube or very early cloth wiring. Mill houses being renovated during Greenville's boom often need complete rewiring because they were built with only a few circuits.

Mill-village houses are often small with limited circuits and small services, and many have been renovated in stages. New construction brings EV chargers and generator requests.

What knob-and-tube wiring replacement involves

Knob-and-tube wiring was designed to release heat into open air. Over a century, its insulation becomes brittle, connections are often modified by later owners, and it has no ground conductor for modern three-prong outlets or GFCI-friendly appliances.

The biggest practical issue is insulation: blowing insulation into walls or attics around active knob-and-tube traps heat, so many insulation programs and contractors require it to be assessed or replaced first. Insurers also frequently ask about it.

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

What moves the price

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 South Carolina: questions

Where in South Carolina is knob-and-tube wiring replacement common?

Our local notes cover Charleston, Columbia, Greenville. Charleston's single houses and townhouses south of Broad, in Ansonborough and Harleston Village, and the early-1900s bungalows of Wagener Terrace and Hampton Park often still carry knob-and-tube wiring.

Who issues permits for knob-and-tube wiring replacement in South Carolina?

The city or county building department where the home is. Charleston: Electrical permits inside city limits come from the City of Charleston's building inspections division; other municipalities and unincorporated Charleston County have their own. Columbia: Inside city limits, electrical permits come from the City of Columbia's building inspections; Richland and Lexington counties and nearby cities have their own. Greenville: Electrical permits inside city limits come from the City of Greenville's Planning and Development office; unincorporated areas are permitted by Greenville County.

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.

Related help in South Carolina

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