Aluminum electrical wiring: danger or simple precaution?

In short

Between roughly 1965 and 1975, copper was expensive and many homes were wired with aluminum. The wire itself is not dangerous; its connections are the issue: aluminum expands, oxidizes and loosens at outlets, switches and splices, which can overheat. The answer is not to rewire everything, but to have every connection checked and secured by a master electrician.

How it shows

Silver rather than copper-coloured wire at the ends, “AL” or “ALUMINUM” printed on cable sheathing visible at the panel or in the basement, and a house from 1965 to 1975. The inspector flags it when seen; he does not remove outlets to check every splice.

Recognized remedies are devices rated for aluminum (marked CO/ALR), approved connectors to join aluminum to copper, or crimp-type connections done by an electrician.

What it changes for the purchase

Most insurers accept an aluminum-wired house provided a verification report from a master electrician, sometimes required within a period after purchase.

The cost is moderate and predictable, so easy to negotiate; the lack of verification is mostly an unknown to resolve.

Orders of magnitude

Verification and securing of connections by a master electrician most often runs from hundreds to a few thousand dollars depending on the number of outlets and devices. Full rewiring is generally not necessary. Orders of magnitude to confirm with a quote.

What to do before buying

Ask the insurer its conditions for an aluminum-wired house.
Have a verification report produced by a master electrician during the inspection condition or right after purchase.
Watch for overheating signs: warm outlet covers, plastic smell, flickering lights.

What Clarity does with it

Clarity flags the mention, files it under the inspector’s label, and adds the insurer and the master-electrician check to the steps before signing.

Does your report mention this? Clarity tells you in five minutes what is priority, what to have checked and what to ask the seller.

Analyze my report

Frequently asked questions

Does all the wiring have to be replaced?

Rarely. Securing the connections is the recognized fix; full rewiring is mostly justified during a major renovation.

An aluminum wire at the main panel, is that the same thing?

No. Large-gauge aluminum service cable is common and accepted; the issue concerns small-gauge branch circuits.

How do you know whether the connections were already secured?

From an electrician’s report or CO/ALR-marked devices; otherwise assume it was not done.

Sources