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Knob-and-tube or aluminum wiring in an older Kitchener home: what insurers ask and what the fix involves

ESA's position is that knob-and-tube wiring is safe when properly maintained by a Licensed Electrical Contractor, and that aluminum wiring is safe when connections are made properly with approved devices. The reason Kitchener homeowners end up dealing with either is usually an insurer, not a code requirement, and the fix is often smaller than the first quote suggests.

Last updated October 24, 2026 · Reviewed by the Kitchener Electricians team

Which Kitchener houses have which wiring

Knob-and-tube was the wiring method used in homes from the early 1900s to the 1940s, according to the Electrical Safety Authority. In Kitchener that means the pre-war brick streets around Victoria Park, Cedar Hill, Mount Hope, the Civic Centre district and the older stretch of King East. Aluminum branch wiring belongs to a different generation: ESA says homes built between the mid-1960s and the late 1970s may have it, which in Kitchener points to the earlier streets of Forest Heights, Stanley Park, Country Hills and Centreville-Chicopee. They are different materials with different problems, and neither automatically means rewiring the house.

Is knob-and-tube wiring safe?

ESA states that knob-and-tube wiring is safe, provided it is properly maintained by a Licensed Electrical Contractor. It also notes that these older systems do not have the safety benefits of modern ones, such as ground fault protection in wet areas, and that the 2021 Ontario Electrical Safety Code removed the installation rules for knob-and-tube because it is no longer installed. The code is not retroactive, so nothing in it requires you to remove wiring that was legal when it went in.

What has usually gone wrong in a Kitchener century home is not the original installation but what came after it: attic insulation blown over the conductors, splices made outside boxes when newer cable was tied in, circuits now feeding a kitchen's worth of appliances, oversized fuses, and no ground for anything with a three-prong plug. ESA's advice is to have a Licensed Electrical Contractor assess the home's electrical system, which it points out is different from a home inspection because it focuses only on the electrical. The contractor checks the conductors for deterioration or damage and recommends replacement only where it is needed.

Is aluminum wiring a problem?

ESA says aluminum wiring is safe if proper connections and terminations are made without damaging the wire, only devices approved for aluminum wire are used, and the installation follows the Ontario Electrical Safety Code and the manufacturer's instructions. The code still permits aluminum wiring today. The weak point in a 1970s side-split is the screw terminal on each receptacle and switch, where decades of expansion and oxidation have loosened the connection. A receptacle that feels warm, a cover plate that has yellowed, a switch that crackles or lights that dim when the fridge starts are the signs the contractor we book for Kitchener looks for first.

What insurers usually ask for

This is the part that actually drives most calls. On knob-and-tube, ESA says many insurers will not provide or renew coverage on homes with this type of wiring, and that some insurers may make you replace it before they provide coverage. On aluminum, ESA says some insurers will not provide or renew coverage without an ESA inspection, and may require repairs or replacement plus a copy of the ESA Certificate of Acceptance.

Insurers set their own rules, and they vary. ESA's advice is to ask your insurance company for its requirements. If you have a renewal letter or a broker's email, give it to the contractor before the visit so the assessment can be written to answer the exact question the insurer is asking, rather than a general one.

What the repair or replacement actually involves

Assessment first. The contractor traces which circuits are still live on the old wiring, opens accessible junction points in the attic and basement, checks the condition of the conductors and the service and panel they hang from, and gives you written findings with photographs and the options priced.
Knob-and-tube replacement, where justified. New cable is fished from the basement and attic through wall cavities with as few openings in the plaster as possible, every device gets a proper box, and the old wiring is disconnected at both ends. Because most knob-and-tube houses also have a small fuse service, the panel and service are often part of the same job. A partial rewire of the floor or rooms that carry the load is a legitimate scope when the assessment supports it and the insurer accepts it.
Aluminum remediation. The fix is at the connections, not the walls: devices rated for aluminum conductors, or copper pigtails joined with connectors made for that purpose, at every device and junction box, plus correct terminations at the panel. It is counted by device and does not open walls.
ESA notification and review. The contractor files the notification under their own licence, ESA reviews the work, and ESA issues the Certificate of Acceptance. ESA suggests keeping a copy for your records; it is the document your broker wants.

What this means for your quote

Expect the contractor to quote an assessment before quoting a rewire, and to split the quote so you can see what the insurer requires versus what is optional. The scope ranges from re-terminating a few dozen devices in a Forest Heights bungalow to rewiring the upper floor of a Victoria Park house with a new 200-amp service, and the Kitchener electrician cost guide explains what moves the number between those two. Details of the knob-and-tube and aluminum wiring service are on that page, or you can describe your house and what the insurer said and the contractor will call back.

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