A knob and tube removal follows a clear sequence. An electrician maps how much of the original wiring is still live, runs new grounded cable to your outlets and fixtures, decommissions the old knob and tube, and then has the work permitted and inspected. In a typical Winnipeg home the job takes anywhere from a couple of days for a partial removal to one to three weeks for a full rewire, depending mostly on access.
If you have decided the wiring needs to go, the next question is usually what the job is actually like to live through. This walks through the process step by step, including the parts that matter most in Winnipeg’s older homes: plaster walls, the choice between removing and abandoning the old wiring, and the chance of asbestos in the building materials. If you are still confirming what you have, start with our guide on the signs of knob and tube wiring, and our guide on how knob and tube compares to modern wiring shows what the new grounded system replaces it with.
The process runs in five stages, from the first assessment to the final inspection. The Electrical Safety Authority recommends starting any older-wiring project with a licensed electrician’s assessment, and that first step is what makes the rest predictable. The table lays out what happens at each stage.
| Stage | What happens |
|---|---|
| 1. Assessment | We trace how much original knob and tube is still live and check its condition and how easy it is to reach. |
| 2. Plan and permit | We scope a partial removal or a full rewire, pull the City of Winnipeg permit, and plan the cable routes. |
| 3. Run new grounded wiring | We fish new grounded cable to your outlets, switches, and fixtures. |
| 4. Decommission the old wiring | The original knob and tube is removed where it is accessible and safely de-energized where it is not. |
| 5. Inspection and patching | The work is inspected to the Manitoba Electrical Code, and we patch the access points we opened. |
The work is done by a licensed electrician throughout, and the permit and inspection are built into the job from the start. By law, all electrical wiring in Manitoba must be inspected, which the City handles inside Winnipeg and Manitoba Hydro handles outside it. Part of the work in many older homes is also clearing the blown-in insulation that was packed around live knob and tube over the years, which home-inspection reference InterNACHI notes is a fire-safety step in itself. That paperwork is what your insurer and a future buyer will ask for, which we cover in our guide on knob and tube and home insurance.
Both happen on a typical job, and the difference comes down to access. Where the old wiring is reachable, in an open basement or attic, we physically remove it. Where a run is buried inside a finished wall that would have to be torn open to reach it, the accepted practice is often to disconnect and de-energize that section and leave it dead in the wall rather than destroying the wall to pull out wire that is no longer carrying power.
The important part is that the old wiring is no longer live, so it is no longer a hazard. One caveat worth knowing is that some insurers want confirmation that all knob and tube has been fully removed, while others accept that it has been properly disconnected. We work to whatever standard your situation calls for, and we document what was removed and what was abandoned so there is a clear record either way.
Some access is unavoidable, but far less than most people expect, and we plan the routes to keep wall and ceiling openings to a minimum. The honest part of this conversation in Winnipeg is plaster. A lot of the city’s older homes have lath-and-plaster walls rather than drywall, and plaster is harder to open cleanly and to patch than drywall is, so it takes more care and adds time.
We fish cable through existing cavities, floor and ceiling gaps, and closets wherever we can, and we show you the access points we expect to open before we start so there are no surprises. The openings we do make are patched as part of the job. What we do not do is open more than the work requires, because every extra hole is more plaster to repair.
It is possible, and it is worth knowing about before any walls or attics are opened. Homes from the knob and tube era can contain asbestos in materials like old plaster or vermiculite attic insulation. The wiring itself is not usually the concern, but the work of reaching it can disturb those materials if they are present.
If asbestos is suspected, it should be tested and, where it is found, removed by a licensed abatement specialist before electrical work begins. That is a separate trade from electrical work, and a responsible electrician will flag the possibility and pause rather than disturbing something that needs a specialist. In a home of that age it is simply a step worth taking before the walls are opened.
A partial removal can be a one- or two-day job, while a full rewire of a whole house usually runs one to three weeks. What moves the timeline is how much original wiring is still live and how hard it is to reach. A home where the wiring is accessible in the basement and attic goes faster than a two-storey with finished plaster walls on every level.
We give you a real timeline after the assessment, once we have actually seen what your house involves. For a sense of the budget alongside the schedule, our knob and tube removal cost guide for Winnipeg covers what the work typically runs.
Most knob and tube removals are done with the family still living in the home, and we work to keep it that way. Power is shut off to the sections being worked on rather than the whole house where possible, so you keep the lights and fridge running in the rest of the home. We work area by area and keep the dust from opening walls and ceilings contained, cleaning up as we go.
Because older homes that need this work often have an undersized panel as well, a knob and tube removal is frequently paired with an electrical panel upgrade or a full home rewiring so the same walls are only opened once. We see this regularly in the plaster-walled character homes around Crescentwood and River Heights, where the access is the hard part and it pays to handle everything together. When the wiring is done, a final inspection signs the work off.
No, knob and tube removal is not a do-it-yourself job. It involves working on live and dead circuits in an older home, running new grounded wiring to code, and pulling a permit, and in Winnipeg the work has to be done by a licensed electrician and inspected. The risks of getting it wrong, from shock to fire, are exactly the ones the work is meant to remove.
A partial removal can take a day or two, while a full rewire of a whole house usually runs one to three weeks. The biggest factors are how much original wiring is still live and how accessible it is, with finished plaster walls adding time. You get a real timeline after an on-site assessment.
Accessible wiring is physically removed, while sections buried in finished walls are often disconnected and left dead in place without tearing the wall open to reach them. Either way the old wiring ends up de-energized and no longer a hazard. Some insurers ask for full removal, so we confirm what your situation requires and document what was removed and what was abandoned.
Sometimes. Homes from that era can contain asbestos in materials like old plaster or vermiculite attic insulation, though the wiring itself is not usually the concern. If asbestos is suspected, it should be tested and, where present, removed by a licensed abatement specialist before the electrical work starts. A good electrician will flag it for testing before disturbing anything.
Usually not. Most removals are done with the family still in the home, with power shut off only to the areas being worked on and the dust contained as walls are opened. A very large full rewire on a tight schedule can be an exception, but for most homes the work is planned around keeping the house livable.
If your home has knob and tube and you want to know exactly what the job would involve, we will assess it and walk you through the scope, the timeline, and the access before anything starts. Learn more about our knob and tube removal service.
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