Rewiring an old house: where to start
Fuse panel, two-prong outlets, breakers that keep tripping: your home is sending you signals. Here’s how to tell what’s urgent, what can wait, and where to begin — without tearing everything apart.
Has your wiring reached the end of the road?
Electrical wiring doesn’t “die” all at once: it ages, gets overloaded, and eventually becomes a hazard. Taken together, these signs often mean it’s time to act:
A fuse panel (instead of breakers)
Often undersized for today’s demands — and some older brands are worth a close look.
Two-prong outlets with no ground
No protection if an appliance faults — a real risk near water.
Aluminum or knob-and-tube wiring
Connections that loosen and heat up over the years.
Breakers that trip, lights that dim
A sign of wiring that’s stretched thin or overloaded.
A hot-plastic smell, scorch marks, warm outlets
That’s an emergency: cut the circuit and have it checked.
It’s not just about comfort
Old wiring is the leading cause of electrical fires. But there’s more: outdated wiring can raise your insurance premium — or get a claim denied. And at resale, an inspector who notes “fuse panel” or “aluminum” often lowers the price or stalls the deal.
Bringing your electrical up to standard protects your family, your home… and its value.
Where to start, in the right order
You don’t redo everything at random. Here’s the logical sequence.
An inspection first
A master electrician assesses the panel, grounding, wiring and circuits. You get a clear picture: urgent, advisable, and a phased plan.
The panel (often 200 A)
The heart of the system. We replace the fuse or outdated panel with a breaker panel sized for today’s needs (charger, heat pump, spa…).
Grounding and protection
We ensure proper grounding and add modern protection: GFCI (shock) near water, AFCI (fire) in bedrooms.
The risky circuits
Two-prong outlets, poorly connected aluminum, overloaded circuits: we fix what’s dangerous first, then complete the rest to your budget.
We start by looking — and you decide.
Groupe Quenneville inspects your wiring, explains clearly what’s urgent, and proposes a phased plan. CMEQ member · RBQ licence · 5-year warranty.
What people ask us
Do I have to rewire everything at once?+
Not always. Sometimes replacing the panel and fixing the dangerous circuits is enough; other times, outdated wiring (knob-and-tube, poorly connected aluminum) calls for a fuller rewire. The right first step is an inspection: we map out what’s urgent, what can wait, and a phased plan.
Are my two-prong (ungrounded) outlets dangerous?+
They’re not illegal, but they offer no grounding — so no protection if an appliance faults. In a kitchen, bathroom or near water, that’s a real risk. We replace them with grounded outlets or GFCI protection.
I have aluminum wiring. Do I have to tear it all out?+
Not necessarily. 1960s-70s aluminum isn’t dangerous in itself, but its connections loosen and heat up over time. The recognized fix is often to secure the connections (COPALUM or approved connectors) rather than rewire everything. A master electrician assesses the best path.
How long does the work take?+
It depends on scope: a panel swap is often done in a day, a full rewire over several days. We plan to limit downtime and coordinate with your other renovation work.
Is this reserved to a master electrician?+
Yes. In Quebec, home electrical work must be done by a company holding an RBQ licence and CMEQ membership. It also protects your insurance: under-the-table work can void it after a claim.
How much does it cost?+
It varies with what we find. At Groupe Quenneville, a regular service call is $150 plus $140/hr (1 hr minimum). We always start by looking, explaining clearly, and quoting the work — no surprises. Free quote at 514-503-1353.
