Aluminum Wiring in Older Homes: Risks & Remediation

What Aluminum Wiring Is, and Why It Was Used

In the mid-1960s, copper prices spiked sharply. To keep new-home construction affordable, builders across the country — including plenty of homes throughout Anne Arundel County — switched to single-strand aluminum wire for 15- and 20-amp branch circuits: the wiring that runs to your outlets, switches, and light fixtures. It was code-compliant, cheaper, and widely used until roughly 1973, when the safety issues became clear enough that most builders went back to copper.

To be clear: this isn't about the thick aluminum feeder cable that still runs safely to service panels and large appliances today. The concern is specifically the smaller-gauge branch-circuit wiring installed in homes built or rewired between about 1965 and 1973.

Why Aluminum Branch Wiring Is a Fire Risk

The U.S. Consumer Product Safety Commission (CPSC) found that homes with this era of aluminum wiring are 55 times more likely to develop fire-hazard conditions at connection points than comparable copper-wired homes. The wire itself isn't the danger — the problem is what happens where aluminum meets a screw terminal or a wire nut:

• Aluminum expands and contracts more than copper with temperature changes, gradually loosening connections
• Aluminum oxidizes at the surface, which increases resistance at the connection point
• Increased resistance means more heat is generated right at that loose, oxidized connection
• Over years, this cycle can progress to arcing, melting insulation, and fire

This is exactly why aluminum wiring problems tend to show up gradually — a warm outlet cover, a flickering light, a faint burning smell — rather than all at once.

Signs to Watch For

• Outlet or switch cover plates that feel warm to the touch
• Flickering lights that aren't explained by the bulb
• A faint burning or "hot plastic" smell near outlets or the panel
• Discoloration or scorch marks around an outlet or switch
• Outlets or switches that stop working intermittently

How to Check If Your Home Has It

1. Check your home's age. Built or last rewired between 1965 and 1973? You're in the primary risk window.
2. Look in the attic or basement. Cable sheathing is often stamped "AL" or "Aluminum" along its length.
3. Have an electrician check a sample outlet. With power safely off, aluminum wire looks dull silver; copper looks orange or reddish-brown. This isn't a DIY step we'd recommend — a licensed electrician can confirm it safely in a short visit.

CPSC-Approved Remediation Options

Not every aluminum-wired home needs a full rewire. The CPSC recognizes three legitimate, permanent remediation paths:

1. AlumiConn Connectors

A set-screw connector block rated specifically for joining aluminum wire to a short copper pigtail at every connection point. It doesn't require specialized tooling, which generally makes it the more widely available and often more affordable connector option.

2. COPALUM Crimp Connectors

A permanent, cold-weld-style crimp connection between aluminum wire and a copper pigtail, applied with a specialized tool. Considered by the CPSC to be a highly durable, permanent fix, but it requires a specifically trained and equipped installer.

3. Full Copper Rewire

Replacing the aluminum branch circuits with copper throughout. The most thorough option and often the most practical choice if you're already opening walls for a renovation, but the most expensive as a standalone project.

What Remediation Costs

Cost depends on the number of connection points (every outlet, switch, and junction box needs to be addressed — partial remediation doesn't resolve the risk), home size, and wall/attic access. A full rewire costs more but may make sense if you're already renovating or the wiring has other issues beyond the aluminum connections.

Insurance, Permits & Documentation

Remediation work on permanent wiring requires an Anne Arundel County electrical permit and inspection — this isn't optional, and it's also exactly what most insurance carriers want to see before they'll reinstate or issue a policy on a home with known aluminum wiring. Unity Electric handles the permit, performs the remediation, and provides documentation of the work and inspection for your insurance file.

Why Homeowners Choose Unity Electric for Aluminum Wiring Remediation

Not every electrician has hands-on experience with aluminum wiring — it requires a different approach than standard copper work, and doing it wrong (or with an unapproved method) can leave the underlying risk in place while giving a false sense of security. Unity Electric will confirm exactly what you have, explain your real options honestly, and give you a free, written estimate before any work begins.

• Free inspection to confirm wiring type and condition
• CPSC-approved remediation methods only
• Permits and county inspection handled for you
• Documentation provided for insurance purposes
• No pressure toward a bigger project than your home actually needs

Frequently Asked Questions