Is it safe to live in a house with knob-and-tube wiring?

Knob-and-tube wiring in undisturbed, original condition may still function, but it has no ground wire, cannot safely handle modern electrical loads, and becomes hazardous when insulation is blown over it. Most electricians and insurance companies recommend replacement.

Will insurance cover a home with knob-and-tube wiring?

Many Kentucky insurance companies will not write new policies for homes with active knob-and-tube wiring, or they charge significantly higher premiums. Some require a licensed electrician's inspection before binding coverage.

How do I know if my house has knob-and-tube wiring?

Look in the attic, basement, or crawl space for porcelain knob insulators and tube sleeves with cloth-covered wires running between them. A licensed electrician can confirm during an evaluation.

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Electrical

Is Knob-and-Tube Wiring Dangerous? What Kentucky Homeowners Should Know

What knob-and-tube wiring is, why insurance companies flag it, and when Kentucky homeowners should replace it.

Lexington Electrical & HVAC TeamOctober 15, 20266 min read

Is Knob-and-Tube Wiring Dangerous? What Kentucky Homeowners Should Know

Knob-and-tube wiring was the standard electrical installation method from the 1880s through the 1940s. In its original, undisturbed state, it can still carry a light load safely. The danger comes when it is asked to carry modern electrical loads it was never designed for, when insulation is blown over the wires, or when the cloth insulation deteriorates and exposes bare conductors.

Why is knob-and-tube a concern today?

The fundamental limitations:

No ground wire — no protection against shock or equipment damage
Not rated for modern amperage — outlets, kitchens, and HVAC draw far more than 1920s homes did
Insulation contact creates fire risk — blown-in insulation traps heat around the wires
Aging connections become brittle and high-resistance — generating heat at junction points

Insurance and real estate implications

Many Kentucky insurance companies flag knob-and-tube wiring during policy reviews or home purchases. Some will not insure an active K&T system at all. A whole-home rewiring resolves the insurance concern and updates the home to a safe, code-compliant system.

What to do next

If your Lexington-area home has knob-and-tube wiring, schedule an evaluation or call 859.457.0426. A licensed electrician can assess the condition and recommend the most practical replacement scope.

Frequently Asked Questions

Is it safe to live in a house with knob-and-tube wiring?: Knob-and-tube wiring in undisturbed, original condition may still function, but it has no ground wire, cannot safely handle modern electrical loads, and becomes hazardous when insulation is blown over it. Most electricians and insurance companies recommend replacement.
Will insurance cover a home with knob-and-tube wiring?: Many Kentucky insurance companies will not write new policies for homes with active knob-and-tube wiring, or they charge significantly higher premiums. Some require a licensed electrician's inspection before binding coverage.
How do I know if my house has knob-and-tube wiring?: Look in the attic, basement, or crawl space for porcelain knob insulators and tube sleeves with cloth-covered wires running between them. A licensed electrician can confirm during an evaluation.