Knob and Tube Wiring & Home Insurance: What Kingston Homeowners Need to Know

Why the insurance industry turned against knob and tube

Knob & Tube Kingston exists because of one specific piece of mail: the letter from your insurance company about the wiring in your walls. Nobody calls an electrician about hundred-year-old wiring on a quiet Tuesday — they call because TD, Aviva, Intact or another Ontario insurer just refused coverage, quoted a punishing surcharge, or made the policy conditional on rewiring within 30–90 days. If that's the letter on your kitchen table, this page is the map.

The insurers' position isn't arbitrary. Knob and tube — standard wiring from the 1880s through the 1940s — has no third grounding conductor anywhere in the system. Its rubberized-cloth insulation dries out and cracks after a century in the walls. It was designed to shed heat in open air, which makes it genuinely dangerous under the blown-in insulation added to most attics since. And it was never rated for modern loads. Add decades of amateur splices buried in walls, and underwriters see a documented fire risk they can quantify — so they price it, or decline it.

The three letters, decoded

• The refusal. Most standard insurers now simply decline new policies on homes with active knob and tube. If you're buying in Sydenham Ward or Portsmouth, this can surface days before closing — and no insurance usually means no mortgage funding
• The surcharge. High-risk and specialty markets will cover the house — at 50–300% above standard rates. That's real money every single year, for as long as the old wiring stays live
• The conditional policy. The most common letter in Kingston: coverage issued or renewed on condition that the knob and tube is replaced within 30–90 days, with proof. Miss the deadline and the policy can be cancelled or non-renewed

The one document that changes everything

Insurers don't want your contractor's invoice, photos, or a home inspector's opinion. They want the ESA Certificate of Inspection — the Electrical Safety Authority's independent, provincial confirmation that the rewiring was done under permit and passed inspection. It's the difference between "the homeowner says it's fixed" and "the regulator says it's fixed." What the inspection involves is on our ESA inspection page; the short version is that it only exists when the work is done by a Licensed Electrical Contractor (ECRA/ESA) under an ESA permit. This is why a cheap unpermitted rewire solves nothing: no permit, no certificate, no change in your insurer's position.

The exact path from letter to standard rates

Five steps, in order — and the order matters when a deadline is running:

• 1. Written quote. A licensed electrician traces the live knob-and-tube circuits and quotes the scope — full or partial removal. Get this in week one
• 2. Rewire under permit. The contractor files the ESA permit and replaces every live knob-and-tube circuit with grounded cable. Typically days, not months, of work
• 3. ESA inspection. Booked for the final day of work wherever possible
• 4. Certificate of Inspection issued. The provincial proof that no active knob and tube remains
• 5. Send it to your insurer. Conditions lifted, refusal reversed, or high-risk coverage replaced with a standard policy

If your deadline gets tight, don't go silent — insurers routinely extend for homeowners who can show a signed contract and a scheduled work date. What kills files is inaction, not timelines.

The savings math

Restoring standard rates typically saves Kingston homeowners $500–$1,500 per year versus surcharged coverage — every year, permanently. Set that against the rewiring cost — $3,000–$6,000 for a partial replacement, up to $14,000–$25,000 for a large century home with a 200-amp panel upgrade (full breakdown on the cost page) — and a partial job can pay for itself inside five years. The certificate also travels with the house: future buyers, lenders and insurers all accept it, which is worth real money the day you sell.