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Knob-and-Tube Wiring Replacement · Georgia
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.
Atlanta's in-town Victorians and Craftsman bungalows in Inman Park, Grant Park, Kirkwood and Virginia-Highland often still have knob-and-tube wiring from the early 1900s, sometimes extended during later renovations. Insurers and buyers frequently ask about it.
Older in-town bungalows often have mixed wiring from several renovations. Fast suburban growth brings a steady stream of EV chargers, basement finishes and panel upgrades.
Summerville, on the hill above downtown Augusta, and the Olde Town and Harrisburg neighborhoods by the river hold homes from the 1800s and early 1900s, and knob-and-tube wiring still runs through many of their attics and crawl spaces. After Hurricane Helene in 2024, owners repairing storm damage often discovered how much old wiring was left.
Historic homes in Summerville and Olde Town can have knob-and-tube or cloth wiring, and mid-century homes often have 100 amp panels. Mature trees mean frequent storm damage to service drops. Raised homes are common in older areas.
Savannah's Landmark Historic District and Victorian District hold homes from the 1800s and early 1900s, and knob-and-tube wiring still runs through many of their attics and crawl spaces. Humidity, termites and periodic flooding are hard on old insulation.
Historic homes often have wiring from many eras, and the historic district's review board regulates visible exterior changes such as meters and equipment. Outdoor equipment near the marsh and water corrodes faster in salt air.
Marietta's historic homes along Whitlock Avenue and Kennesaw Avenue and in the Church Street–Cherokee Street district were built from before the Civil War into the early 1900s, and knob-and-tube wiring survives in some of them, often extended during later renovations. Crawl spaces and attics give the electrician routes for new cable.
Historic homes can have knob-and-tube or cloth wiring, and mid-century homes often have 100 amp panels. Newer subdivisions add EV chargers and generators.
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.
Our local notes cover Atlanta, Augusta, Savannah, Marietta. Atlanta's in-town Victorians and Craftsman bungalows in Inman Park, Grant Park, Kirkwood and Virginia-Highland often still have knob-and-tube wiring from the early 1900s, sometimes extended during later renovations.
The city or county building department where the home is. Atlanta: Inside city limits, electrical permits come from the City of Atlanta's Office of Buildings; surrounding cities and counties issue their own. Augusta: Electrical permits come from Augusta's planning and development department. Savannah: Inside city limits, electrical permits come from the City of Savannah's development services; Chatham County and the island communities have their own.
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.
It is not recommended, and many codes and insulation programs prohibit it, because the wiring relies on open air to cool.
An electrician can test it. Many homes have a mix of active and abandoned knob-and-tube.
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