Aluminum wiring repair · Toronto & GTA
Aluminum wiring repair and replacement in Toronto and the GTA
Aluminum branch wiring isn't banned, but its connections need the right parts and careful work, and insurers ask about it. We inspect it first, then repair every connection properly or replace the circuits with copper.
Background
Why some 1960s and 70s homes have aluminum wiring
For a stretch from the mid-1960s to the late 1970s, aluminum branch wiring went into a share of new houses, townhouses and apartments, largely because copper was expensive. Plenty of homes from that era in North York, Scarborough, Mississauga and Bramalea were built with copper, and some were built with aluminum. The age of the house alone won't tell you which.
The wire itself carries current fine. The problems are at the ends. Aluminum expands and contracts more than copper as it warms and cools, and it forms a surface oxide that resists current. Over years, a connection made with a device rated only for copper can loosen and run hot. That's why the fix focuses on connections, not cable.
Your options
Repairing the connections or rewiring in copper
After the inspection we recommend one of these, or a mix of both. The right answer depends on the condition of the wiring, how long you plan to stay and what your insurer will accept.
| Option | What's involved | Best when |
|---|---|---|
| Repair every connection (pigtailing) | Each aluminum end joined to a copper pigtail with a connector rated for both metals, at every outlet, switch, fixture and junction box | The wiring is in good condition and your insurer accepts a repair |
| Aluminum-rated devices | Outlets and switches marked for use with aluminum, installed with careful terminations | A small number of devices, as part of a wider repair |
| Rewire in copper | New copper circuits run to replace the aluminum ones | Walls are opening for a renovation, the wiring is damaged, or your insurer requires it |
Ordinary wire nuts and outlets made only for copper are not a safe way to join or end aluminum wire.
How we work
Inspection first, then every connection
Insurers and homeowners both call us about aluminum wiring, and we always begin with a full home electrical inspection. We confirm where the aluminum circuits are, open a sample of devices and the panel, and look for heat damage, wrong connectors and loose terminations. Anything that needs fixing straight away is made safe first.
A connection repair is only as good as the one we miss, so we work through the house device by device and box by box, including fixtures and junction boxes that are easy to overlook. Where rewiring makes more sense, we plan it the same way as any rewire: room by room, with small openings and the power back on each evening.
Everything is built to the Ontario Electrical Safety Code and inspected by ESA wherever a permit is required.
- Full home electrical inspectionAluminum circuits found and connections checked
- Urgent fixes firstHot or damaged connections made safe
- Every connection addressedOutlets, switches, fixtures and junction boxes
- Panel terminations checkedBreakers and lugs suited to aluminum conductors
- Written summaryWhat was repaired or replaced, for your insurer
Cost factors
What changes the price of aluminum wiring work
You get a fixed, written price after the inspection. The things that move it most:
- Repair or rewire. Pigtailing every connection is a much smaller job than replacing the circuits.
- How many devices. Every outlet, switch, light and junction box counts, so a larger house means more connections.
- What's behind the plates. Overstuffed or damaged boxes take longer to make right.
- Access. Finished basements and ceilings slow down a rewire.
How it works
How an aluminum wiring job runs
Inspection
We confirm the aluminum circuits and check the connections.
Urgent fixes
Anything running hot is made safe first.
Recommendation and price
Repair, rewire or a mix, with a fixed written price.
The work
Every connection repaired, or new copper circuits run.
ESA and paperwork
Inspected where a permit applies, and a written summary for you.
Questions
Aluminum wiring repair: common questions
Is aluminum wiring illegal in Ontario?
No. Aluminum branch wiring is permitted, and ESA's own guidance says it can be safe when it's installed and connected properly. The risk sits at the connections: outlets, switches and splices that weren't made for aluminum, or that have loosened over the years.
How do I know if my house has aluminum wiring?
Check the cable in an unfinished basement or near the panel. The outer jacket is often printed with "AL" or "ALUMINUM", and the bare ends of the conductors look silver rather than copper-coloured. A full home electrical inspection confirms it and checks the condition of the connections.
What is pigtailing?
Each aluminum conductor is joined to a short length of copper wire using a connector rated for aluminum-to-copper connections. The copper pigtail then goes to the outlet or switch. Done at every connection in the house, it fixes the weak point without replacing the wiring in the walls.
Will my insurer accept repaired aluminum wiring?
Many do, but insurers set their own rules, and some want the wiring replaced. Ask yours what they need before we start. Work done under an ESA permit ends with a Certificate of Acceptance, and we put in writing what was repaired or replaced. Our guide to aluminum wiring and insurance in Ontario goes into more detail.
Do you take out the ESA permit?
Yes. In Ontario, the licensed contractor files the notification of work with the Electrical Safety Authority (ESA) and books the inspection. We handle it on every job that needs one, and you get the ESA Certificate of Acceptance when the work passes. Keep it: insurers and home buyers often ask for it.
To price your job, send us
- The address and the age of the home
- What your insurer or home inspector told you, and any deadline
- Photos of the panel and of the cable printing near it, if you can see it
- Any warm, flickering or discoloured outlets and switches
Where we work
Aluminum wiring repair across the GTA
We serve homeowners, builders and businesses across Toronto and the GTA.
- North York
- Toronto
- Forest Hill
- Etobicoke
- Scarborough
- Mississauga
- Vaughan
- Richmond Hill
- Oakville
- Caledon
- King
- Barrie
- Markham
- Aurora
- Newmarket
- Brampton
- Alliston
- Wasaga Beach
- Collingwood