Buying, selling or insuring an older Winnipeg home? Here's what knob and tube wiring actually means for your safety, your insurance and your budget.
If you live in one of Winnipeg's older neighbourhoods, there's a fair chance part of your house was wired before your grandparents were born. Wolseley, River Heights, Crescentwood, St. Boniface and the West End are full of beautiful homes from the early 1900s, and plenty of them still have some original knob and tube wiring tucked behind the plaster.
Most people find out one of three ways. A home inspector flags it during a sale. An insurance company asks for an electrical inspection before renewal. Or someone opens a ceiling during a reno and finds porcelain knobs and cloth-covered wire running across the joists.
None of those is a reason to panic. It is a reason to get some straight answers. We're Camco Electric Ltd., and we inspect and replace knob and tube wiring in Winnipeg homes. These are the questions homeowners ask us most.
Not sure what’s in your walls? Book a knob and tube inspection →
What Is Knob and Tube Wiring?
Knob and tube was the standard way to wire a house in Canada from roughly the 1880s until the 1940s. Instead of the plastic-sheathed cable you'd find in a new build, it uses single wires run separately through the house, held in place by two porcelain parts:
- Knobs hold the wires away from the framing, usually nailed to joists or studs.
- Tubes protect the wires where they pass through holes drilled in the wood.
For its time, it was good work, and many of these systems have lasted far longer than anyone expected. The catch is that they were designed for a house with a few light bulbs and maybe a radio. Not one with a microwave, a window air conditioner, a home office and a phone charger in every room.
Is Knob and Tube Wiring Dangerous?
Knob and tube wiring isn't automatically dangerous just because it's old. The real risks come from decades of wear, amateur modifications, insulation packed around the wires and the lack of a ground wire. Whether your system is safe comes down to its condition, and only an inspection can tell you that.
Here's what we're actually looking for when we inspect it:
- No ground wire. Knob and tube has no grounding conductor, so it doesn't give you the protection a modern three-prong circuit does. It's also why you can't just swap in three-prong outlets and call it done.
- Brittle insulation. The rubber and cloth covering on these wires dries out and cracks over time, especially in hot attics. Once it starts to crumble, you can end up with bare copper sitting next to wood framing.
- Bad splices and add-ons. This is the big one. Over 80-plus years, plenty of homeowners and handymen have tapped into old circuits to add an outlet or a light. Those connections are often where the trouble starts.
- Insulation around the wires. Knob and tube was built to shed heat into open air. When an attic or wall gets filled with blown-in insulation, those wires can run hotter than they were ever meant to.
- Too few circuits. Older homes often have only a handful of circuits for the whole house. And if someone has ever put in a bigger fuse to stop one from blowing, that wire is no longer properly protected.
- Problems you can't see. Most of the system is hidden inside walls and ceilings, which is exactly why issues go unnoticed for years.
A partial upgrade isn't a full upgrade
This catches a lot of Winnipeg homeowners off guard: your house can have modern wiring and knob and tube at the same time. It's common to see a renovated kitchen on brand-new circuits while the upstairs bedroom lights still run on the original wire.
A new breaker panel or a few new outlets doesn't prove the old wiring is gone. Someone has to trace the circuits to know for sure, and that's what a professional electrical inspection does.
How Knob and Tube Wiring Affects Your Manitoba Home Insurance
For a lot of people, insurance is a bigger headache than the wiring itself. Insurers look at the age and condition of your electrical system when they decide whether to cover a home, and knob and tube ticks several of their boxes at once: it's ungrounded, it's old, and nobody knows for sure what's been done to it over the years.
Depending on your insurer and your house, you could be asked to:
- Get an inspection from a licensed electrician before they write or renew a policy
- Make specific repairs as a condition of coverage
- Pay a higher premium until the wiring is upgraded
- Replace some or all of the active knob and tube, sometimes within a set timeframe
Some insurers will simply decline a new policy or a renewal while active knob and tube is in the house.
Can you get home insurance with knob and tube wiring in Manitoba?
Often, yes. Insurers in Manitoba don't all follow the same rules, and having knob and tube doesn't make a house uninsurable. Some companies will offer coverage after a satisfactory electrical inspection. Others want it replaced first, or within a certain period after you take possession.
If you're buying an older home, call your insurance broker before you remove conditions on your offer, not after. Ask exactly what they need to see. It's a much easier conversation while you still have time to book an inspection or get a quote.
Insurer asking for an electrical inspection? We can help you get the paperwork they need →
Knob and Tube Removal in Winnipeg: What's Involved?
Most people picture every wall in the house getting torn open. That's rarely how it goes. Older Winnipeg homes have plaster walls, original trim and built-ins worth keeping, and a good electrician works around them. Here's how a typical knob and tube replacement runs with us.
1. Inspection and assessment
We start by figuring out what's actually there: which circuits are still knob and tube, which ones are live, what shape they're in, and what has already been updated.
2. A plan that fits your house
No two older homes are wired the same way. How much needs replacing depends on the size of the house, how easy it is to get into the walls and attic, past renovations and how many original circuits are still in use. You get a plan based on what we found, not a one-size-fits-all package.
3. New wiring
We run new, grounded circuits that meet current code. Wherever we can, we fish the wire through existing wall and ceiling cavities from the basement and attic to keep openings to a minimum. Some houses do need a few access holes, and we'll tell you where before we start.
4. Disconnecting the old wiring
Once the new circuits are in, the old knob and tube is disconnected from power and tested to confirm it's dead. It doesn't all have to be pulled out of the walls. What matters is that it's properly disconnected and can't be accidentally re-energized.
5. Permits, inspection and paperwork
Rewiring in Winnipeg requires an electrical permit. Inside city limits, permits are issued by the City of Winnipeg under its Electrical By-law, not by Manitoba Hydro. We take care of the permit and the inspection, and you end up with documentation you can hand straight to your insurer.
How Much Does Knob and Tube Replacement Cost in Winnipeg?
Honest answer: it depends on the house. Some homes only have two or three active knob and tube circuits left. Others are original from top to bottom. Anyone who quotes a firm number without seeing the house is guessing.
The main things that affect the cost:
- The size of the home and the number of floors
- How easy it is to reach the attic, basement and wall cavities
- How many active knob and tube circuits are left
- Whether the panel or electrical service needs upgrading too
- How much renovation work has already been done
- How much wall or ceiling access the job needs
- Anything extra you want done while we’re in there, like added outlets or new lighting
The way to get a real number is an on-site assessment and a written quote. We'll walk you through the scope before you commit to anything, so you know what you're paying for and why.
Should You Replace Knob and Tube Before Selling Your Winnipeg Home?
If you're getting ready to list an older home in Wolseley, River Heights or Crescentwood, expect knob and tube to come up. A buyer's home inspector will almost certainly flag it, and that can lead to:
- Requests for a separate electrical inspection
- Buyers worried about getting insurance
- Negotiations over the price
- Requests to have the work done before possession
- Delays while insurance and financing get sorted out
Dealing with it before you list takes those questions off the table and can make the house easier to sell. That said, replacing it isn't the right financial call for every seller. An inspection gets you the facts first, so you can decide whether to rewire, disclose it and price accordingly, or land somewhere in between.
Knob and Tube Wiring FAQs
Is knob and tube wiring illegal in Manitoba?
No. Having existing knob and tube isn't illegal on its own. Its condition and any changes made to it still have to meet electrical safety requirements, all new work has to follow current code, and your insurer may set its own conditions on top of that.
Can knob and tube wiring be repaired instead of replaced?
Sometimes. Depending on what an inspection finds, an electrician may recommend targeted repairs rather than a full rewire. Whether that's enough also depends on what your insurer will accept.
Does a new electrical panel mean the knob and tube is gone?
No. A new panel replaces the panel, not the wiring inside your walls. Old circuits stay connected unless someone specifically traces and replaces them.
Do you have to open up all the walls to replace knob and tube?
Usually not. Most new wiring can be fished through existing cavities with a few small openings. Some homes need more access than others, depending on how they were built.
Can I buy a home in Winnipeg that still has knob and tube wiring?
Yes. Just have the wiring inspected and confirm you can insure the house before you firm up the deal, so you know what upgrades and costs you're taking on.
How do I find out if my home needs knob and tube removal?
Book an inspection with a licensed electrician. They'll check the accessible parts of the system, identify any active original circuits and tell you whether replacement makes sense.
Book a Knob and Tube Inspection in Winnipeg
Whether you've just spotted knob and tube in an inspection report or your insurer is asking for an electrical assessment, we can help you figure out what you're dealing with. Camco Electric works on homes across Winnipeg, including older neighbourhoods like Wolseley, River Heights, Crescentwood, St. Boniface and the West End.
We'll tell you what's in your walls, what needs fixing now, and what your options are.
Camco Electric Ltd. · Winnipeg, Manitoba
Phone: 204-880-1000
Website: www.camcoelectric.ca
Camco Electric Ltd. — Built on Trust.
