Knob & Tube Wiring in Alton, IL

Look up at the joists. Knob and tube runs as separate hot and neutral wires spaced apart, threaded through white porcelain tubes where they pass through the framing and supported along their length by porcelain knobs nailed to the wood. Where a wire enters a box or a fixture it is sleeved in a flexible cloth called loom. Nothing about it looks like the plastic-jacketed cable in a newer house.

Inside the living space, the tells are indirect: two-prong outlets throughout, a fuse box instead of breakers, cloth-covered cords coming out of ceiling boxes, and light switches with a push-button or a distinctive toggle. None of those proves knob and tube by itself, and a house can have some original wiring left behind walls after decades of partial updates. That is exactly the situation worth having somebody confirm before you buy or sell.

Knob and tube appears in many older North American homes, and about 27.6% of Alton's housing units were built in 1939 or earlier. In an older house, original wiring is one possibility to consider when outlets in a room go dead for no obvious reason.

Housing age: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B25034 (Alton city, Illinois). Wiring era and characteristics: InterNACHI.

National Electrical Code Article 394 restricts energized knob and tube in hollow spaces of walls, ceilings, or attics where loose, rolled, or foamed-in-place insulation envelops the conductors. How that provision and any local requirements apply depends on the wiring and project, so confirm the scope with the local authority having jurisdiction.

Code reference: NFPA 70, National Electrical Code, Article 394, Concealed Knob-and-Tube Wiring.

Insurance can create a deadline for this work. InterNACHI reports that many insurers will not insure houses with knob and tube wiring, while some may consider an exception after an electrician evaluates the system. The carrier decides its own underwriting requirements, so ask what documentation or work it requires.

For an Illinois non-renewal, review the notice's stated reason and deadline. The Illinois Department of Insurance explains notice timing, appeal rights, and the Illinois FAIR Plan Association for people who cannot find coverage elsewhere. Confirm the details that apply to your policy with the insurer or the Department.

A sale can create a separate timeline because buyers and lenders may have insurance requirements. If knob and tube appears in an inspection report, clarify what the insurer, lender, and local jurisdiction require before deciding the scope.

Sources: InterNACHI on knob-and-tube and insurance · Illinois Department of Insurance, If Your Homeowners Insurance Policy is Non-Renewed.

Access is a major cost factor in a rewire. Getting new cable to device locations in a finished older house can take very different amounts of labor, which is why two houses of the same square footage can price differently. A site visit may be needed before Justin can price the work.

These are the things that move it:

• How much is still live. Two remaining circuits and a whole-house rewire are different projects.
• Square footage and the number of device locations. Every outlet, switch, and fixture is a termination.
• Plaster or drywall. Lath and plaster is slower to open and slower to patch than drywall.
• Access. A full basement and a walkable attic cut labor. A crawlspace, a finished basement ceiling, or a balloon-framed wall adds it.
• Whether the panel is part of the scope. A fuse box or a full panel may need to be addressed so new circuits have suitable capacity and spaces.
• How much you do at once. Staged work spreads the cost, but a mobilization repeats each time.

A phased approach may be possible when the circuit layout allows it. Priority depends on loading, insulation contact, damage, and other site conditions. If an insurer or closing has set a date, share it on the first call.