Aluminum branch wiring in an older house: what to do?
No, rewiring is rarely the first answer. Solid aluminum branch circuit wiring, used widely in houses built between roughly 1965 and 1973, is a real fire risk, but the risk lives at the connections rather than in the wire itself. The accepted remediations treat the connections: a complete copper pigtail repair using connectors listed for the purpose, or replacement of every device with one rated for aluminum. Have an electrician who has done this work before assess it, and treat any warm or discoloured outlet or switch as urgent.
What the actual hazard is
Aluminum is a fine conductor. It is used for service entrance and feeder conductors in new construction today without controversy. The problem was specific to small solid aluminum conductors used for fifteen and twenty amp branch circuits during a copper price spike in the late 1960s and early 1970s, terminated on devices and with connectors designed for copper.
Three properties of aluminum combine badly at a screw terminal. It expands and contracts more than copper as it heats and cools, so a connection loosens over years of cycling. It oxidises, and unlike copper oxide, aluminum oxide is a poor conductor, so the resistance at the joint rises. And it creeps under sustained pressure, so a screw tightened correctly on installation day is not as tight a decade later.
A loose, high-resistance connection carrying current gets hot. Hot connections inside a plastic or metal box behind a wall are how this becomes a fire. The wire in the middle of the run is not the problem and never was.
Labor estimate, computed
Remediating aluminum branch circuit connections throughout a house: open every device box, clean and prepare the conductors, install listed copper pigtail connectors, replace devices, and reterminate at the panel.
$805 in labor
$33.53 per hour × 24.0 hours
How this number is built
The wage is an employment-weighted average of the published median hourly wages for Electricians, Standard Occupational Classification 47-2111, across 390 United States metropolitan areas covering 650,830 workers, from the May 2025 OEWS, published May 15, 2026. It is an average of metropolitan medians, not a national median, because the extract behind this site is metropolitan. The labor-hour figure is 24.0 hours: roughly twenty minutes per device box across a house with around sixty boxes, plus panel work and testing, done by one electrician over three working days
The product is a labor cost only. It carries no equipment, materials, refrigerant, permit fee, disposal, travel, overhead, warranty, or profit, and a quoted job price is normally a multiple of it. A working contractor bills a shop rate rather than a wage. Treat this as a floor for the labor content of the work and nothing more.
Source: Bureau of Labor Statistics, Occupational Employment and Wage Statistics.
How to know what you have
Aluminum branch wiring is normally identifiable at the panel or at a receptacle: the conductor is silver rather than copper coloured, and the cable jacket is often printed with the word ALUMINUM or the abbreviation AL. Houses built between about 1965 and 1973 are the ones to check.
Do not confuse it with two other things. Aluminum service entrance and feeder conductors, which are large stranded conductors, are current standard practice and are not the hazard discussed here. Copper-clad aluminum, a copper sheath over an aluminum core, was also used and behaves like copper at the termination.
Signs of an active problem are worth knowing: outlet or switch cover plates that are warm, flickering that follows a load rather than the weather, a smell of hot plastic, discoloured or scorched receptacles, or circuits that work intermittently. Any of those means stop using the circuit and call now.
The remediations that are accepted
The federal consumer product safety guidance recognises a small number of repairs, and the distinction between them matters because insurers and inspectors ask which was used.
Copper pigtailing with a listed connector. A short copper conductor is joined to the aluminum with a connector specifically listed for aluminum-to-copper connections, and the copper end lands on the device. Done at every device and every splice in the house, this is the standard remediation. The connector type matters enormously, and the wrong connector, including ordinary twist-on wire nuts, makes the situation worse rather than better.
Devices rated for aluminum. Replacing every receptacle and switch with one marked for direct connection of aluminum conductors. This addresses devices but not splices in boxes, so it is often combined with the above.
Complete rewiring. Always effective and rarely the proportionate first step. It becomes reasonable when walls are already open for a renovation, when the wiring is damaged as well as aluminum, or when the house is small enough that the cost difference is modest.
Practical consequences worth knowing
Insurance is the one that surprises people. Some carriers decline to write a policy on a house with untreated aluminum branch wiring, and others require documentation of a remediation before binding. If you are buying, find this out before the appraisal rather than after, because it can affect the schedule.
Ask any contractor bidding the work which connector they will use, by manufacturer and listing, and whether the job includes every splice or only the devices. Ask whether the work will be permitted and inspected. And ask how many of these they have done, because this repair is unforgiving of shortcuts and is not a general handyman task.
What this site publishes
The labor figure above is computed from published wage data times the stated hours and covers labor only, with no connectors, devices, or permit fees. The device count behind the hours is an assumption stated above and your house will differ. We publish no project prices and reproduce no third-party cost tables. Contractors on record appear alphabetically and never by any commercial relationship.
Sources
Where another organisation publishes a cost range for this work, it is linked below and not reproduced here. Their figures are theirs to maintain, and a stale copy on this page would be worse than a link.
- Consumer Product Safety Commission, aluminum wiring hazard information The federal agency that first documented the hazard and the accepted repair methods.
- United States Fire Administration, electrical fire safety
- National Fire Protection Association
- National Electrical Contractors Association
Reviewer: Not yet assigned, this page is waiting on sign-off from a named electrical contractor, and the slot stays visibly empty until one signs it. Last reviewed: September 21, 2026, the date this build of the page was produced. Review is editorial. It is not a site visit, an inspection, or advice about your specific equipment.
This page names no contractor and recommends none. Contractor listings on this site are ordered alphabetically or by distance and never by any commercial relationship. Nothing here is a rating, an endorsement, or a recommendation, and nothing here is legal advice about your local code.