Aluminum branch circuit wiring in Ontario homes (1965-1980) is a documented fire risk that requires assessment and remediation. Here is a complete guide for 2026.
Why Aluminum Wiring Is a Fire Risk
Aluminum expands and contracts more than copper under heat cycles, loosening connections at outlets and switches. Loose connections create high electrical resistance, generate heat, and can cause fires. Aluminum also oxidizes at connections, further increasing resistance.
ESA-Accepted Remediation Options
Full copper rewire: $8,000-$20,000+. Most complete solution. CO/ALR rated devices: Replace every outlet and switch with CO/ALR-rated devices designed for aluminum wiring. $1,500-$4,000 throughout. AlumiConn connectors: Pigtail each device with a connector rated for aluminum-to-copper joining. $2,000-$5,000. All require ESA permit and inspection.
Insurance Impact
Many Ontario insurers refuse coverage or charge premium surcharges until ESA Certificate of Inspection for remediation is provided. ESA certificate satisfies most Ontario insurer requirements.
How to Identify
Check panel for aluminum-labeled wires. Outlet wiring is silver-colored, larger gauge than copper, possibly stamped AL. Hire a licensed electrician for comprehensive assessment.
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