Lighting & Pot Lights
Transform any room with expertly installed lighting.
About lighting & pot lightsKnob & Tube Replacement
Knob-and-tube wiring was standard before the 1950s but is now considered a significant safety hazard. We safely remove and replace it with modern wiring.
Scope of work
- Complete knob-and-tube removal
- Modern NMD90 copper wire replacement
- Proper grounding (original had none)
- Insurance compliance documentation
- Insulation can be safely added after
- ESA inspection and certificate
Knob-and-tube wiring lacks a ground wire, uses degraded rubber insulation that cracks and exposes conductors, and cannot handle modern electrical loads. Many insurance companies refuse to cover homes with active K&T wiring. Our rewiring process involves carefully removing old wiring, running new NMD90 cables through walls, installing modern receptacles with grounding, and providing documentation for your insurance company.
Knob & Tube Replacement FAQs
How much does knob and tube replacement cost in Toronto?
Full knob-and-tube replacement in a typical Toronto home runs $9,000–$15,000 depending on home size, wall finishes, and accessibility. Many homeowners phase the work by floor. The price includes new NMD90 copper wiring, grounded outlets, ESA permit and inspection, and insurance documentation.
Is knob and tube wiring illegal in Ontario?
It isn't illegal, but it's a recognized fire and insurance risk: no ground wire, brittle insulation, and no capacity for modern loads. Most insurers refuse new policies or charge steep premiums on homes with active K&T, which is why buyers and sellers usually replace it.
Can you replace knob and tube without destroying plaster walls?
Yes. We specialize in fishing new wiring through finished walls with minimal, strategic openings — particularly important in Toronto's century homes with original plaster and trim. Patching is dramatically cheaper than re-plastering entire walls.
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Wiring & Rewiring
Whether you're building new or renovating, we provide complete electrical wiring services that meet or exceed the Ontario Electrical Safety Code.
About wiring & rewiringNeed knob & tube replacement?
Free estimates on all projects. Same-day service available across the GTA. Send the details and a licensed electrician replies the same day.
Or call 416-837-4038Free written quote
Free quote: Knob & Tube Replacement
Tell us about the job and we reply the same day. For an emergency, call 416-837-4038 instead.
A licensed electrician answers every call, day or night.