Is aluminum wiring safe?

Two places to look, neither of which requires tools. First, the cable jacket where wiring is visible (attic, basement, crawlspace): aluminum branch-circuit cable is typically marked "AL" or "ALUMINUM." Second, at a device with the cover off, the conductor is a dull silver-gray instead of copper's orange-brown.

That said, identification is worth doing properly. Partial aluminum (some circuits aluminum, some copper, sometimes from later alterations) is common, and a licensed electrician should confirm what's actually there before anyone plans a fix around an assumption.

The era to check in Spokane is the 1970s housing stock (roughly 11% of city housing units), since aluminum branch wiring was used approximately from 1965 to 1973.

Aluminum is a reasonable conductor. Utilities use it to this day for the service conductors coming into your home. The issue with the smaller branch-circuit wire of that era is mechanical, not electrical: aluminum expands and contracts more than copper as it heats and cools under load.

Over decades of daily thermal cycling, that movement can loosen the connection where the wire terminates at an outlet, switch, or fixture. Copper does this too, but far less. The wire itself is usually fine; the connections are what age.

The failure pattern is specific: a termination loosens, resistance at that connection rises, and resistance is what makes heat. That's why the symptoms show up at devices: a warm cover plate, a faint hot-plastic smell at one outlet, a flickering light on one circuit, rather than everywhere at once.

This is also why the fix targets terminations. The cable run inside the wall is not where these systems fail; the ends are.

The general shape of the fix: every termination on the aluminum circuits gets redone with connectors and methods approved for the copper-to-aluminum transition, so each device ends up properly terminated. Done systematically, that addresses the actual failure point on every outlet, switch, and fixture on those circuits.

The right method depends on the devices, the boxes, and how the home was wired, so we don't prescribe one from a webpage. An electrician confirms the wiring and picks the approved approach that fits. What we can say plainly: a blanket rewire is usually not necessary, and anyone who quotes one without looking at the connections first is skipping a step.

The repair side of this work is on our electrical repair page.

Aluminum branch wiring comes up in two predictable places: insurance applications, where some carriers ask about it directly, and pre-sale home inspections, where it gets flagged as a defect for the buyer. In both cases, the question behind the question is "has anyone addressed the connections?"

Documented professional remediation is generally what resolves both conversations, so keep the invoice and any inspection sign-off. Undocumented work, or work nobody can describe, is what keeps the question open.

There are real cases: wiring that's been damaged, decades of bad alterations, walls already open for a major remodel, or connection failures so widespread that spot work is chasing its tail. In those situations a rewire stops being the expensive option and starts being the honest one.

If that's where your home lands, the scope and process are on the whole-home rewiring page. If it isn't, remediation will get you there for far less disruption.