Knob and Tube Wiring Removal in Kingston

What removing knob and tube actually involves

Knob & Tube Kingston connects homeowners with licensed ECRA/ESA electricians who remove knob-and-tube wiring the way insurers require it to be done: under an ESA permit, fully documented, and finished with a Certificate of Inspection. If you're picturing a demolition site — plaster torn open in every room, the family in a hotel for a month — take a breath. That's not how a modern rewire works in a Kingston century home.

Knob and tube was standard from roughly the 1880s to the 1940s: two separate strands of copper strung through ceramic knobs and tubes, insulated with rubberized cloth that has been drying and cracking for close to a century. It has no ground conductor, was never rated for modern loads, and becomes genuinely unsafe when it's buried under blown-in attic insulation. The fix isn't a repair — it's replacement, circuit by circuit, until nothing old is left live.

How the crew gets new cable through finished walls

The core technique is fishing: the electrician runs new NMD90 grounded cable through the existing wall and ceiling cavities, working from the basement below and the attic above. Access comes from small, strategic openings — behind outlet boxes, at ceiling fixtures, inside closets — that are patched at the end of the job. In most homes, what's visible afterward is a handful of neat drywall patches ready for paint, not open framing.

As each new circuit goes live, the old knob-and-tube run is disconnected and, wherever it's accessible, physically removed. The dead wiring left inside sealed cavities is abandoned in place — that's standard practice and the ESA inspector expects it. What matters is that nothing old carries current anymore.

Partial vs full rewire

Very few Kingston century homes are 100% knob and tube in 2026. Most have been renovated in waves — a rewired kitchen from the 90s, new basement circuits from a 2010 finishing job — with the original wiring surviving in the upstairs bedrooms and the ceiling lighting. That's why the first step is always a trace: the electrician identifies exactly which circuits are still live knob and tube.

• Partial replacement — only the remaining live knob-and-tube circuits are rewired. Typical range $3,000–$6,000. Often all your insurer actually requires
• Full bungalow rewire — every circuit replaced, typically $5,000–$8,000
• Full two-storey rewire — $8,000–$15,000 depending on finishes and access
• Large century home + 200 A panel upgrade — $14,000–$25,000, the whole electrical file closed in one project

What drives your number up or down — storeys, finished ceilings, panel age, attic and basement access — is broken down in detail on our 2026 cost page.

How long it takes, and living through it

Most removals run 2 to 5 working days. A partial replacement can be done in two; a full two-storey rewire sits closer to five; a large home with a panel upgrade can stretch beyond a week. Crews work room by room and keep essential circuits — fridge, heat, some lights — powered overnight, so you can almost always stay in the house. Expect dust sheets, furniture pulled off the walls, and short planned outages during changeovers.

What's included when it's done right

In Ontario, this work must be performed by a Licensed Electrical Contractor (ECRA/ESA) under an ESA permit — that's the law, and it's also the only path to the document that actually solves your problem. A proper quote includes:

• The trace and written scope — full or partial, no guesswork
• New NMD90 grounded cable, boxes, outlets and switches
• The ESA permit and inspection fees — filed and booked by the contractor
• Patching of the access openings
• The ESA Certificate of Inspection at the end

That certificate is the entire point. It's the piece of paper that lifts your insurer's conditions and restores standard rates — typically saving Kingston homeowners $500–$1,500 per year versus surcharged high-risk coverage. The full mechanics of refusals, conditional letters and deadlines are on our insurance page, and what the ESA inspection itself involves is covered on the ESA inspection page.