Knob-and-Tube Wiring: What It Means for Your Sale

What sellers of older homes should know about knob-and-tube wiring, how it affects a sale, and how to talk about it honestly.

If your house has knob-and-tube wiring somewhere in it, you are not alone, and it is not a reason to panic. It is a reason to get informed before you put a sign in the yard.

Knob-and-tube was standard wiring for a long stretch of house-building history, and a lot of it is still doing its job quietly in attics and walls. The issue is not that it is old. The issue is that it was not designed for the electrical load of a modern household, it usually has no ground wire, and insulation packed around it over the decades can be a fire risk in a way it was not when the house was built.

For a sale, the practical impact is usually about insurance and financing before it is about the wiring itself. Some insurers will not write a policy on a home with active knob-and-tube without an inspection or an upgrade. Some lenders ask about it too. This can affect your buyer pool more than it affects your negotiation, because it may limit who can even finance the purchase in the first place.

Before you list, it is worth finding out how much of the house is still on knob-and-tube versus how much has already been updated. Many older homes have a mix, where some circuits were replaced over the years and others were not. A licensed electrician can tell you exactly what is live and what it would cost to bring the rest current.

Once you have that number, you have options. You can complete the update before listing, which widens your buyer pool and often justifies your price. You can disclose it clearly and price the home to reflect the remaining work. What you should not do is leave it as a surprise for the inspection report, because by then it reads as something hidden rather than something factored in.

A beautiful house and an outdated panel are both true at the same time. The sellers who do well are the ones who say so plainly and let the number speak for itself.