Aluminum branch wiring went into Canadian homes from roughly the mid-1960s to the late 1970s, and in 2026 many insurers will not bind or renew a policy on one of those homes without a licensed electrician’s inspection and, where needed, proof that the connections have been remediated. The wire itself is not the hazard; the connections are. Three remedies are accepted: CO/ALR-rated devices, approved copper-to-aluminum connectors at every connection, or a full rewire to copper. In Edmonton all three need an electrical permit.
Which Edmonton homes have aluminum wiring
Copper prices spiked in the 1960s and builders switched to aluminum for the 15 and 20 amp branch circuits that feed lights and receptacles. The Electrical Safety Authority puts the era at the mid-1960s to the late 1970s. In Edmonton that lines up with a large share of the bungalows, split-levels and early two-storeys in neighbourhoods that filled in during the city’s late-1960s and 1970s growth.
You can often tell without touching anything. Look at exposed cable in an unfinished basement ceiling, the furnace room or the attic hatch. Aluminum cable jackets are printed with ALUMINUM, AL or ALUM along their length. Do not pull receptacles or switches out of the wall to look; that is a job for an electrician with the circuit de-energized.
One point of confusion: the large service conductors that feed your panel from the meter are commonly aluminum, even in new homes, and that is normal. The insurance concern is the small branch wiring behind your light switches and plugs.
Why aluminum wiring fails at the connections
The Electrical Safety Authority states it plainly: aluminum wiring is safe when the connections are made correctly with devices approved for aluminum. The problems happen at screw terminals and wire joints. Aluminum expands and contracts more than copper as a circuit heats and cools, so terminals loosen over decades. The metal oxidizes, and the oxide layer resists current. It is also softer, so a nick during the original installation becomes a weak spot. A loose or corroded connection heats up, the heat loosens it further, and eventually it arcs.
Warning signs include cover plates that feel warm, flickering lights, a smell of hot plastic near a receptacle, discoloured plates, and receptacles or switches that work intermittently. Any of these on a 1970s circuit is a call-today situation, not a watch-and-see one.
The Canadian Electrical Code does not require you to remove existing aluminum wiring. Nothing in the 2024 edition changed that. What the code does require is that any work on it, repair or replacement, is done under a permit to the current edition.
The three accepted remedies
CO/ALR devices
Receptacles and switches marked CO/ALR are designed for direct connection to aluminum conductors. Replacing every standard device on an aluminum circuit with a CO/ALR device is the lowest-cost route, but it only addresses the device terminals. Splices in ceiling boxes, behind light fixtures and in junction boxes are left as they were, and some insurers will not accept this method on its own.
Approved connectors (pigtailing)
An electrician adds a short copper pigtail to each aluminum conductor using a connector that is approved for joining copper to aluminum, then lands the copper on a standard device. Done at every device and every splice in the house, and documented, this is the remedy most insurers in our experience accept. Ordinary twist-on wire connectors not rated for aluminum do not count, and neither does anti-oxidant paste on a standard device.
Full rewire to copper
Replacing the aluminum branch circuits with copper removes the question permanently. It is the most disruptive option and usually makes sense during a major renovation, when walls are open anyway, or when the insulation on the aluminum conductors is already brittle or damaged. One Edmonton price guide puts a full aluminum-to-copper rewire at roughly $8,000 to $20,000 depending on the size of the house and how much finished wall has to be opened and patched. Our home rewiring page explains how we scope that kind of job.
What the insurer letter actually asks for
Insurer wording varies, but the letters we see from Edmonton homeowners usually ask for the same things:
- An inspection of the electrical system by a licensed (sometimes worded as certified) electrician.
- A written report on company letterhead describing the wiring type, its extent and its condition.
- A description of the remediation performed, or a quote and a date by which it will be done.
- The City of Edmonton permit number and confirmation that the work passed inspection.
Ontario and Alberta brokers describe the same pattern: many insurers require a full inspection and may require copper upgrades or approved remediation before they will bind coverage. A report that says only “wiring appears fine” rarely satisfies an underwriter; one that names the remedy, the permit and the inspection date usually does.
Homes from this era often come with two other items underwriters flag. A 60 amp service may need to be upgraded to 100 amps before some insurers will write the policy, and a Federal Pioneer Stab-Lok panel is commonly flagged on its own. If your letter mentions either, see our posts on Federal Pioneer panels and electrical panel upgrades.
Permits, inspection and timelines
The City of Edmonton lists repair or replacement of aluminum wiring specifically as work that requires an electrical permit. A few practical points follow from the City’s rules:
- Homeowner permits are available only to someone who owns and lives in a single-family house and does the work personally. A rental, a duplex or a condo must be done under a master electrician’s permit.
- Permits are not issued for wiring that is already concealed, so a rewire is inspected before the drywall goes back on.
- Work must start within 90 days of the permit being issued, and the permit expires after one year.
- Inspections are booked through 311 or the City’s SelfServe portal, and Edmonton offers remote video inspections for some trade permits.
Pigtailing a typical bungalow is measured in days; a full rewire is measured in weeks, mostly because of the drywall and painting that follow. If your insurer has given you a deadline, tell us the date when you request an estimate so the permit and inspection can be scheduled to meet it. Our post on electrical permits in Edmonton covers the permit process in more detail.
When to call an electrician
- Your insurer or mortgage lender has asked for an electrical inspection or remediation letter.
- You are buying or selling a home built between the mid-1960s and the late 1970s.
- A cover plate is warm, a receptacle smells hot, or lights flicker on one circuit.
- You are planning any renovation that touches the existing circuits, including swapping light fixtures.
- A receptacle or switch has stopped working and the breaker has not tripped.
MNR Electric has worked on Edmonton homes since 2005, and aluminum remediation is routine work for us. We inspect, write the report your insurer needs, pull the permit, do the remediation and attend the inspection. For a hot receptacle or a burning smell, treat it as a repair call today rather than an estimate next month.
Quick answers
Is aluminum wiring illegal in Alberta?
No. The Canadian Electrical Code does not require existing aluminum wiring to be removed. Any repair or replacement, however, must be done under an electrical permit and built to the current code edition.
Will my insurer cancel my policy over aluminum wiring?
Many insurers require an inspection by a licensed electrician and may require approved remediation or a copper upgrade before they bind or renew coverage. Most letters set a deadline, and a documented, permitted remediation normally satisfies them.
Can I pigtail aluminum wiring myself?
Edmonton treats repair or replacement of aluminum wiring as permit work, and homeowner permits are limited to owner-occupied single-family homes. Because the connections are exactly where aluminum fails, and insurers want a licensed electrician’s report, we recommend against it.
How much does aluminum wiring remediation cost in Edmonton?
Pigtailing is priced per device and splice, so it depends on the size of the house. A full rewire to copper has been quoted in Edmonton price guides at roughly $8,000 to $20,000. MNR Electric provides a written quote after an inspection.
