Toronto · Toronto Hydro service area
Knob-and-tube removal and replacement in Toronto
Toronto has more knob-and-tube left in its walls than anywhere else in the GTA. We inspect the house first, make anything urgent safe, then replace the old circuits with grounded wiring and hand you ESA's certificate for your insurer.
Toronto housing
Where knob-and-tube turns up in Toronto
The old city was largely built while knob-and-tube was the normal way to wire a house. Victorian and Edwardian semis in the Annex, Riverdale and Leslieville, row houses off the Danforth, and early 1900s homes in the Beaches and Roncesvalles all went up in that era. Leaside and much of East York followed in the 1920s to 1940s, near the tail end of it.
Most of these houses have been partly rewired since. What we usually find is a mix: a newer panel, a renovated kitchen on modern cable, and original runs still feeding bedrooms, hallway lights or an upper floor. Those leftover circuits are the ones insurers ask about, and the ones a home inspector flags when the house is sold.
Narrow lots and shared walls shape the job too. In a semi or a row house, your wiring stays on your side of the party wall, and cable routes have to run within your own half. We plan around that from the start.
The house type changes the job
Replacing knob-and-tube in Toronto's common house types
Every house is different, but these patterns hold across most of the jobs in the old city.
| House type | Typical areas | What shapes the work |
|---|---|---|
| Victorian or Edwardian semi | The Annex, Riverdale, Leslieville | Tall plaster walls and a shared party wall. Cable runs up your own exterior walls and down from the attic. |
| Row house | Off the Danforth, parts of Leslieville | Narrow floor plates and little attic space. More small openings, carefully patched. |
| 1920s to 1940s detached | Leaside, East York, Davisville | Often an open attic and an unfinished basement, which make fishing cable much easier. |
| Converted multiplex | The Annex, High Park, Roncesvalles | Several units, sometimes with their own panels. Each unit's circuits are traced and replaced in turn. |
Ages are approximate. Renovations change what's behind the walls more than the original build date does.
How we do it
Inspection first, then the old runs come out
Insurers and homeowners both call us for knob-and-tube work, and we always start with a full home electrical inspection of the house as it is. We map every circuit still running on the original wiring, check for splices into newer cable, and look for insulation, heat damage or overfused circuits. Anything urgent is made safe first.
Then we file the ESA permit and replace the old circuits with grounded copper wiring, built to today's code. Old runs are disconnected and made dead at the panel. If the panel is full or still on fuses, we'll tell you whether a panel upgrade in Toronto belongs in the same job.
For the full service, including what replacement involves and what affects the price, see knob-and-tube replacement.
- Every live run foundIncluding the one to the porch light
- Urgent fixes firstDamaged or overheating circuits made safe
- Grounded copper circuitsRun within your side of a semi or row house
- Old wiring made deadDisconnected at the panel for good
- Certificate of AcceptanceESA's sign-off, ready for your insurer
How it works
Knob-and-tube replacement in a Toronto house
Inspection
Every remaining knob-and-tube circuit traced and recorded.
Written plan
Routes, openings, phases and a fixed price.
Permit
Filed with ESA before the work starts.
Rewire
Floor by floor, with power back each evening.
Sign-off
ESA inspects, and you get the certificate.
Questions
Knob-and-tube replacement in Toronto: questions
Our insurer gave us 60 days to remove knob-and-tube. Is that realistic?
Often, yes, if we can inspect early. Tell us the deadline when you get in touch. The inspection shows how many circuits are left, and from that we can say whether the work fits the window or whether it's worth asking your insurer for more time with our written plan in hand.
The seller said the house was rewired. Can there still be knob-and-tube?
It happens a lot in Toronto. A house can be rewired floor by floor over decades, and a single run to a third-floor bedroom or a porch light gets missed. Rewired can also mean the panel was replaced and nothing else. Our inspection traces what is still live, not what the paperwork says.
We want to insulate the attic. Does the wiring matter?
Yes. Knob-and-tube relies on open air around the wires to stay cool, so it shouldn't be buried in blown-in insulation. If your attic still has it, have it checked and replaced, or at least disconnected, before the insulation goes in.
Does the work need anything from Toronto Hydro?
Not for the rewiring itself, which happens on your side of the panel. If the panel or the service has to be upgraded at the same time, we arrange the disconnect and reconnect with Toronto Hydro as part of that job.
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