Are you getting your house ready to sell this spring? One thing that you should do is make sure your house doesn’t have Knob and Tube wiring, and consider getting it replaced with modern wiring. We know the amount of work this takes, and that’s why we’re here to help.
What is Knob and Tube Wiring?
Knob and tube wiring was the standard electrical system used in North America from the 1880s through the 1940s. It consists of single-insulated copper wires run through porcelain tubes and supported by porcelain knobs to keep wires away from wood. Often, old wires are visible but have already been disconnected and replaced with modern Romex. It should be looked at regardless because of safety concerns. While not illegal to have or sell, knob and tube is an outdated electrical system that lacks a ground wire and was never designed for modern electrical loads. Because of this, knob and tube wiring is a significant “red flag” in the real estate market that can complicate your selling experience. Here’s everything you need to know.
It Scares Buyers and Their Inspectors
Knob-and-tube is an outdated system (pre-1950s), and most modern buyers hear one thing: “This house needs electrical work = more money.”
Home inspectors will flag it immediately, which:
- Creates doubt
- Slows negotiations
- Leads to lower offers
Even if it’s technically still functioning, it feels risky to buyers.
It gives Buyers the Leverage to Negotiate
Once knob-and-tube shows up in an inspection report, buyers will:
- Ask for a credit
- Demand replacement before closing
- Or walk away
And they usually overestimate the cost.
Example:
- Actual replacement: $8–15k
- Buyer asks for: $20k+ credit
So you lose more money than the upgrade would’ve cost.
Financing Can Fall Apart
Some lenders won’t approve mortgages on homes with knob-and-tube wiring.
That means:
- Fewer qualified buyers
- Deals falling through late
- Longer time on market
This is especially true with stricter loan types.
Insurance Becomes a Nightmare
Many insurance companies:
- Refuse coverage
- Or charge much higher premiums
No insurance = no closing.
So even if a buyer wants the house, they might not be able to insure it.
It Limits the Home’s Functionality
Knob-and-tube wiring:
- Wasn’t designed for modern electrical loads
- Often can’t safely support today’s appliances
Buyers think: “I’m going to have to redo this anyway.”
It Increases Your Sale Price
Upgrading the electrical system:
- Makes the home feel move-in ready
- Increases perceived value
- Attracts stronger offers
It turns your home from: “project house” into: “ready to go”
If you are selling, have us confirm if the knob and tube is active. After our inspection, you’ll know the degree of threat it might pose and whether your wiring needs may exceed its capacity. We can also advise you on the cost to replace knob and tube. At Tri‑Point Electric, our licensed electricians are veterans at remediating this wiring method to give you peace of mind. Click here to learn more and get your free knob and tube inspection.