Most homeowners think about the electrical panel exactly twice: when something stops working, and when they want to add something big. This guide covers both. It explains how to judge whether your service is adequate, what decides whether you can install a Level 2 EV charger, why older wiring has quietly become an insurance problem, and how permits work in Ontario. The answers change with the era of the house, from century properties in The Glebe to 1970s bungalows in Nepean and new builds in Riverside South.
How to Tell If You Need a Panel Upgrade
Two questions get blurred here constantly, and separating them saves money. The first is capacity, meaning how much current your service can deliver. Many older Ottawa homes were built with 60 amp or 100 amp service, generous when heating was gas or oil and nobody owned a car that plugged in. The second is physical space, meaning how many breaker positions the panel has and how many are free.
A panel can be electrically adequate for your load and still be completely full, with nowhere to land a new circuit. That is a different problem with a different fix, and a subpanel sometimes solves it for a fraction of the cost. An electrician who opens the panel and looks before quoting is doing the job properly; one who quotes a 200 amp service change over the phone is guessing.
Signs worth investigating
– Breakers that trip repeatedly on the same circuit under normal use, not just at motor startup – Lights that dim noticeably when the furnace, well pump or air conditioner kicks in – Fuses rather than breakers, or a panel brand your home inspector or insurer has flagged – Scorch marks, a burning smell, warmth at the panel cover, or a persistent buzz – Extension cords doing permanent duty because there are not enough outlets
That last one deserves a caveat, because a shortage of receptacles is rarely a capacity problem. Much common work, including breaker replacement, subpanels, pot lights, surge protection, hot tub wiring and smoke and CO detector installation, sits well below a panel replacement in cost. A contractor offering a full range of electrical services should tell you which category your problem falls into rather than defaulting to the biggest job.
The EV Charger Decision, in the Right Order
Ottawa driveways are filling up with EVs, and the sequence homeowners follow is usually backwards. The charger gets bought first, an electrician is called, the load calculation says the panel cannot support it, and the project stalls with a box in the garage. Do it the other way around.
Step one: get the panel assessed
A Level 2 charger typically wants a dedicated 240 volt circuit. Whether your panel can carry that circuit is a load calculation, not a guess and not a rule of thumb. It accounts for your service size, heating type, existing large loads such as a range, dryer or water heater, and the charger’s continuous draw. Two houses with identical 100 amp panels can land on opposite sides of the answer because one heats with gas and the other with baseboards.
Step two: choose the charger to fit the answer
Chargers are sold at a range of amperages, and a lower amperage unit on a smaller circuit will still refill most daily commutes overnight. Knowing your capacity before you shop means you buy something that can actually be installed. If the calculation comes up short, your options are a service upgrade, load management hardware, or a smaller charger.
Step three: plan the run
Distance from panel to parking spot drives conductor size and labour. A charger three metres from the panel on a garage wall is straightforward. One at the far end of a detached garage in Manotick, with a trench in between, is not.
Where capacity comes up short, electrical panel upgrades from 100 amp to 200 amp service are the usual path, and doing that alongside the charger install avoids paying twice for the same permit and inspection.
Older Wiring and the Insurance Question
Ottawa has a great deal of housing stock built before 1970, and two wiring types from that era turn up regularly. Knob-and-tube is common in homes built before roughly the 1950s, and aluminum branch circuit wiring was used widely in the late 1960s and into the 1970s. Both appear in otherwise well-kept homes in Westboro, Alta Vista and parts of Gloucester.
Neither becomes dangerous the moment it is discovered, but both have known failure modes, and the practical pressure comes from insurers. Many insurers decline coverage on homes with knob-and-tube or require remediation as a condition of the policy, and aluminum branch wiring often triggers a requirement for approved connection repairs. That turns a slow maintenance question into an urgent one at exactly the wrong moment: renewal, a pending sale, or the week after a home inspection.
Get it assessed on your own schedule instead. Rewiring is priced largely by how much framing is accessible, so it is far cheaper folded into a renovation that already has walls open.
Permits, ESA and Licensed Contractors
In Ontario, electrical work falls under the Electrical Safety Authority. Most residential work beyond like-for-like device replacement requires notification to the ESA followed by an inspection, and work done for hire must be performed by a licensed electrical contractor.
That matters for three reasons. Unpermitted panel or charger work can surface as a problem at sale, an insurer can take a position on undocumented work after a claim, and the inspection is a second set of eyes on a job you cannot check yourself. Asking your contractor for the ESA notification number is a normal request, and a licensed contractor expects it.
Backup Power and Generators
Ottawa has seen enough multi-day outages that standby generators have moved from luxury to considered purchase, particularly around Manotick, Greely and the rural edges of Kanata.
The distinction that matters is between a portable generator you roll out and connect manually, and a standby unit with an automatic transfer switch that starts on its own and switches the house over with nobody present. The second costs more and requires a permanent installation, but it is the only version that helps while you are away. Homes on well water have a particular stake here: when the power goes the pump stops, so the house has no water at all, not merely no lights. Size for the well pump, the sump pump and the furnace.
Electrical Services Ottawa handles panel upgrades, EV charger installation, rewiring, generator installation and 24/7 emergency calls across the region, at (343) 459-3141.
Frequently Asked Questions
Will an EV charger force a 200 amp service upgrade?
Not necessarily. Plenty of Ottawa homes on 100 amp service can support a Level 2 charger, particularly if they heat with gas and have no other large electric loads. The only way to know is a load calculation on your specific house, and it also tells you what amperage of unit to buy.
How long does a panel upgrade take?
The physical work on a straightforward service change is usually done within a day, with the power off for several hours of it. The longer part is coordination: ESA notification, inspection scheduling, and where the meter is involved, arranging the utility disconnect. Ask for the whole sequence up front.
Is knob-and-tube wiring illegal in Ontario?
Existing installations are not automatically illegal, and old wiring need not be torn out simply for being old. The pressure usually comes from insurers rather than regulators. New circuits cannot be run in knob-and-tube, and any circuit you modify generally has to be brought up to current requirements.
What does an electrical safety inspection check?
Service and panel condition, grounding and bonding, breaker sizing against conductor sizes, visible wiring defects, GFCI protection in wet areas, and smoke and CO alarm coverage. Worth doing before you buy a home, and before you assume the panel can take another large load.
Can I do my own outlets and light fixtures?
Homeowners in Ontario may perform electrical work in their own single-family home, but it still requires ESA notification and inspection, and the rules are stricter than most people expect. Work done for hire must be carried out by a licensed contractor, and undocumented DIY electrical reliably slows a closing.
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