Aluminum Wiring on a Home Inspection Report
Single-strand aluminum branch wiring went into houses built from about 1965 into the mid-1970s. The wire isn't the problem; the connections at outlets, switches and splices are. The good news: the CPSC spells out a repair that fixes every connection without tearing out the walls.
I'm Wes Johnston, a Realtor with Trueblood Real Estate in Fishers. Before real estate I earned a construction engineering management degree from Purdue and spent about ten years designing custom homes and running their construction in Hamilton County. I'm not a home inspector, electrician, plumber or engineer, and this isn't a substitute for one. It's how I explain these findings to my own clients. Sources are linked as you go.
Short answer: aluminum branch wiring is a fire-safety item because its connections can overheat over time. It's fixable. A licensed electrician trained in COPALUM or AlumiConn connectors pigtails every connection with copper, the repair the CPSC recommends. Get that quote, and your insurer's answer, before the inspection deadline.
- Typical cost to fix
- Priced per connection, so get a written quote. Electrician time runs about $50 to $130 an hour. A full copper rewire is about $6 to $10 per sq. ft.
- Who to call
- A licensed electrician trained in COPALUM or AlumiConn repairs. Your insurance agent, early.
- Deal-breaker?
- Usually not. It becomes one only if you can't insure the house or agree on the repair.
Cost source: HomeAdvisor electrician cost guide (updated June 19, 2026) and HomeAdvisor panel and rewiring guide (updated June 17, 2026), national figures
- 01What is aluminum wiring and how can I tell if my house has it?
- 02Is aluminum wiring dangerous?
- 03What are the warning signs of a failing aluminum connection?
- 04Is all aluminum wiring a problem? What about the range, dryer and service?
- 05How do you fix aluminum wiring? Is COPALUM or AlumiConn better?
- 06How much does it cost to fix aluminum wiring?
- 07Should I ask the seller to fix aluminum wiring? Can I still insure the house?
- 08I'm selling a house with aluminum wiring. Should I fix it first?
What is aluminum wiring and how can I tell if my house has it?
This is about single-strand aluminum wire on the everyday branch circuits that feed outlets, switches and lights. The CPSC says it was used from the mid-1960s, after a copper shortage, and that cable installed between 1965 and the mid-1970s may be aluminum, in new houses, additions and rewired circuits alike. Houses built before 1965 are unlikely to have it (CPSC Publication 516, June 2011). Pillar To Post puts the window at the mid-1960s to the late 1970s (Pillar To Post).
To check, look at the outer jacket of the cable where you can see it: an unfinished basement, the attic, the garage. Aluminum cable is marked "AL" or "ALUMINUM" every few feet (CPSC). It looks like any other plastic-sheathed cable otherwise. If you can't tell, an electrician can.
In central Indiana, that era is the ranches, split-levels and early suburban subdivisions on the edges of Indianapolis and in the older parts of the surrounding towns. Typical report wording: "Single-strand aluminum branch circuit wiring observed. Recommend evaluation by a licensed electrician familiar with aluminum wiring repair."
Is aluminum wiring dangerous?
The connections can be. The CPSC explains that aluminum connections go through several deterioration processes that raise their electrical resistance, the damage is cumulative, and the higher resistance causes overheating, "sometimes at hazardous levels" (CPSC Publication 516).
The number people quote comes from a national survey done for the CPSC by Franklin Research Institute. It found that homes built before 1972 and wired with aluminum were 55 times more likely than copper-wired homes to have at least one outlet connection reach "fire hazard conditions." That survey looked only at outlet connections in pre-1972 homes, and "fire hazard conditions" meant cover-plate screws reaching 300°F, sparks, or charred material around the outlet (CPSC).
Pillar To Post adds a bit of history: a new aluminum alloy and aluminum-compatible devices came out in 1972 and solved many of the problems, so later houses are more likely to have them, though it still says to have an experienced electrician evaluate them (Pillar To Post).
What are the warning signs of a failing aluminum connection?
The CPSC lists these (CPSC Publication 516):
- Outlet or switch cover plates that are warm or hot to the touch.
- Flickering lights.
- Circuits that stop working.
- The smell of burning plastic at an outlet or switch.
Any of those is an electrician today, not after closing. The same publication warns that aluminum connections have been reported to fail and overheat without any warning signs first, so no symptoms doesn't mean no problem.
For an emergency, the CPSC allows a temporary fix on a single failed connection, but says to follow up with a complete repair using its recommended methods as soon as possible, and warns against doing this work yourself (CPSC).
Is all aluminum wiring a problem? What about the range, dryer and service?
No. Two things on a report often get lumped in with branch wiring and shouldn't be:
- Large aluminum circuits for a range, dryer, AC or the main service. Pillar To Post says the problems center on branch circuits smaller than 8 gauge, and that 8 gauge and bigger, like dryer or stove wiring, does not present a problem (Pillar To Post). They still need sound connections, but they're not this finding.
- Copper-clad aluminum, marked "CU-clad" or "copper-clad" on the jacket. The CPSC's repair guidance doesn't cover it (CPSC), and InterNACHI's life-expectancy chart lists copper-clad aluminum wire at 100-plus years (InterNACHI).
If your report just says "aluminum wiring" without saying which, ask the inspector. A note about the service entrance cable is a very different conversation from single-strand aluminum on the bedroom circuits.
How do you fix aluminum wiring? Is COPALUM or AlumiConn better?
The CPSC recognizes three permanent repairs (CPSC Publication 516):
| Repair | What the CPSC says |
|---|---|
| Rewire with copper | The best method, but often impractical or expensive |
| COPALUM crimp connector | A copper pigtail joined to each aluminum wire with a dedicated crimp tool. Only electricians trained by the manufacturer are authorized to install it. Over 25 years of field experience. |
| AlumiConn connector | A setscrew pigtail connector for when COPALUM isn't available. Too new to have a long safe-performance history, so use a qualified electrician. |
| CO/ALR outlets and switches | Better than ordinary devices if carefully installed, but failed lab tests and are "at best, an incomplete repair" |
| Twist-on wire connectors | Not a permanent repair; substantial numbers overheated severely in CPSC testing |
| Other crimp connectors | CPSC staff strongly recommends against them |
Pillar To Post adds that a pigtail with aluminum-rated twist connectors depends entirely on the electrician's skill, and that some believe a poorly done pigtail is worse than doing nothing (Pillar To Post). That's why I'd ask for COPALUM first and AlumiConn second.
Aluminum is a job where the work is in the boxes, not the walls. Every outlet, switch, light fixture and splice gets opened and pigtailed, including the junction boxes in the attic and basement that nobody thinks about. When I read a quote, I check three things: it names the method, it says every connection, and it doesn't quietly mean new CO/ALR outlets. Ask the electrician whether they're trained on the method they're quoting.
Houses from this era often have an older panel too. If yours does, read the Federal Pacific or Zinsco page and price both on one visit.
How much does it cost to fix aluminum wiring?
Pigtail repairs are priced by the connection, and I couldn't find a current published cost guide for COPALUM or AlumiConn work that I'd stand behind, so I'm not quoting a per-connection number. Here's what I can source:
| Item | National range | Source |
|---|---|---|
| Licensed electrician, hourly | $50 to $130 | HomeAdvisor, June 2026 |
| Service call, first hour | $100 to $200 (many have a 1 to 4 hour minimum) | HomeAdvisor |
| Whole-house rewire | $6 to $10 per sq. ft., or $12,000 to $20,000 | HomeAdvisor, June 2026 |
To get a real number, count the outlets, switches, light fixtures and junction boxes, and ask for a written per-connection price for COPALUM or AlumiConn, with the total. Compare that to the rewire number. Pigtailing usually wins in a finished house because the walls stay closed.
Should I ask the seller to fix aluminum wiring? Can I still insure the house?
Yes, ask, but get the electrician in first. You can't negotiate a number you don't have. Then choose:
- A complete repair of every connection with COPALUM or AlumiConn by a qualified electrician, with an invoice and a letter describing what was done and where.
- A credit equal to the written quote, if you'd rather pick the electrician and do it right after closing.
On insurance, I don't have a published insurer survey for aluminum branch wiring to point you to, so I won't guess. Call the agent quoting your policy, ask whether they'll write the house, and ask whether a completed CPSC-recommended repair with the electrician's letter changes the answer. Do it inside the inspection period.
For the hire, remember that Indiana leaves electrician licensing to local government. There's no state electrician license, and in Indianapolis the city's Department of Business and Neighborhood Services licenses electrical contractors after an exam and board approval (City of Indianapolis, Contractor Licenses, read October 2026). Ask for that license plus proof of training on the connector they use. Deadlines: how the inspection period works in Indiana.
I'm selling a house with aluminum wiring. Should I fix it first?
Usually, yes. A buyer's inspector will find it, and "aluminum wiring" on a report reads scarier than it is. A completed CPSC-recommended repair with the electrician's letter turns it into a finished item with paperwork, which is a much easier conversation than a buyer's repair request on a deadline.
At minimum, get the quote so you know the number. Known wiring conditions belong on the Indiana seller's disclosure. More on pre-listing repairs: what to fix before selling.
Why a Realtor Who Built Houses Reads Reports Differently
A home inspection report runs dozens of pages, and almost every item ends with "recommend evaluation by a qualified professional." That wording is there for the inspector's protection. It doesn't tell you which items are a quick fix and which ones change the deal.
I spent about ten years designing houses and running their construction before I sold them. When my clients get their report, we go through it together and sort it into what to ask for, what to take as a credit, what to just fix yourself later, and what needs a specialist before the inspection deadline. If you're buying or selling in central Indiana, I'm happy to do the same for you.
Construction engineer turned Realtor. Straight answers before you sign.
Send Me the Page That Worries You
Tell me the address and the finding. I'll tell you how serious it looks from a builder's point of view and how it usually gets handled in a deal.
Send a MessageWhat's Your Home Worth?
Selling an older home? Start with a realistic price based on recent local sales.
Have an Aluminum Wiring Question?
Send the address and the line from the report. I'll get back to you with how serious it looks and how it usually gets handled.
General guidance from a Realtor with a construction background. Hire the licensed trade for the diagnosis and the fix.
General information from a Realtor with a construction background, not electrical, insurance or legal advice. Repair guidance is from CPSC Publication 516. Cost ranges are national figures from HomeAdvisor (updated June 2026); Indianapolis-area quotes vary. Have a licensed electrician trained in aluminum wiring repair evaluate the house, and ask your insurer directly about coverage.