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Many Canadian homes were wired long before heat pumps, EV chargers, induction ranges and basement suites were common. Their original service was sized for lighting, a few appliances and a furnace running on gas or oil. As families switch to electric heating, charge a car overnight or add a second kitchen, that service can reach its limit, and breakers start to trip when several large loads run at once on a cold evening.
A service upgrade is a coordinated job. The electrician calculates the load, takes out the permit or files the notification, works with the utility to disconnect and reconnect the house, and has the installation inspected. Planned well, a single upgrade can carry the home through the next generation of equipment instead of being repeated a few years later.
Signs your electrical panel and service are too small for your home
- Breakers trip when ordinary appliances run together, such as the dryer, the oven and the baseboard heaters on a winter evening.
- The panel has no empty spaces left, and new circuits have been squeezed in over the years.
- You're replacing an oil or gas furnace with an all-electric heat pump, or adding electric heat.
- You want a Level 2 EV charger in the garage or the driveway.
- You're planning a basement suite, an addition, a hot tub or a second kitchen.
- The house still runs on its original service, and the load has grown with every renovation.
- An electrician or a home inspector has noted that the service is close to its capacity.
Panel upgrade or service upgrade: what's the difference?
People often say panel upgrade when they mean one of two related jobs. The panel is the box of breakers that divides power into circuits. The service, called the entrée électrique in Quebec, is everything upstream of it: the mast or underground conduit, the service conductors, the meter base and the main disconnect that link the house to the utility. Adding a subpanel, or swapping a full panel for one with more spaces, gives you more room for circuits but doesn't give the house any more power.
When the house truly needs more capacity, the service itself has to grow, which means larger conductors, usually a new meter base and mast, a panel rated for the new capacity, and work by the utility on its side of the meter. The electrician starts with a load calculation, based on the size of the house and its heating, cooling and major appliances, to tell which of the two jobs you actually need.
What an electrical service upgrade involves, step by step
- Assessment: the electrician reviews the existing service and panel, the loads already in place and the equipment you plan to add.
- Permit or notification: the electrician files it with the provincial authority or the municipality before the work starts.
- Utility request: the electrician contacts the utility, which confirms the connection point and any work needed on its side.
- Installation: new service conductors, meter base, mast or conduit, grounding and bonding, and a new panel, with every circuit reconnected and labelled.
- Changeover: the utility disconnects the old service and connects the new one, so the house is without power for a period the electrician schedules with the utility.
- Inspection: the installation is inspected, and the documents you receive at the end go in your house records.
Coordinating a service upgrade with your utility and the inspection authority
A service upgrade involves three parties: your electrician, the electrical safety authority or permit office, and the utility. In Quebec, only a member of the CMEQ can carry out work on an electrical installation and send Hydro-Québec a request for work. Hydro-Québec records the request, gives the contractor and the customer a confirmation number, assesses the scope of any work on its side and sends the customer the related agreements. Once the preparatory work is done, the contractor tells Hydro-Québec it can begin, and only Hydro-Québec connects the house to its line.
In Ontario, the Licensed Electrical Contractor files a notification with ESA before starting, and ESA's inspections for this kind of job include one for the service itself. In British Columbia, BC Hydro reminds customers that an authorization or permit is needed before electrical products are installed, and Technical Safety BC's bulletin on upgrading electrical systems in single dwellings adds that an upgrade brings grounding and bonding up to current code and calls for ground-fault protection on receptacles such as those in bathrooms and outdoors.
The utility's schedule often sets the pace. If the upgrade has to be finished before a heat pump or a charger is installed, start the conversation early and ask your electrician to line up the utility's work with the inspection.
Sizing your electrical service for heat pumps, EV chargers and future loads
Heating is usually the biggest factor. Natural Resources Canada notes that a 200 ampere service is normally required for an all-electric air-source heat pump or a ground-source heat pump, and that switching from a gas or oil heating system may make a panel upgrade necessary. An add-on air-source heat pump working with an existing furnace generally doesn't require a service upgrade, although the age of the service and the home's total load may still make one necessary.
Then look ahead. An EV charger, a heat pump water heater, an induction range, a hot tub or a future basement suite each adds load, and upgrading once for what you expect is far less disruptive than upgrading twice. Ask the electrician to leave spare breaker spaces, to label the panel clearly, and to tell you whether a load management device, which shares capacity between large appliances, could meet your needs without a larger service.
Common surprises during a panel upgrade in an older home
- Grounding and bonding that no longer meet current requirements and have to be redone as part of the upgrade.
- Overhead service wires that don't have the clearance the code now requires above a deck, a driveway or a roof.
- A panel location that suited the old service but is no longer acceptable once the basement has been finished around it.
- Old branch circuits, such as knob-and-tube or aluminium wiring, that need attention when they are reconnected to the new panel.
- Receptacles in bathrooms and outdoors that must be given ground-fault protection once the work is done.
Electrical Panel Upgrades: frequently asked questions
How do I know if I need a 200-amp electrical service?
Only a load calculation will tell you. Natural Resources Canada notes that a 200 ampere service is normally required for an all-electric air-source or ground-source heat pump, while an add-on heat pump alongside a furnace generally doesn't call for a service upgrade. An electrician adds up your current and planned loads before recommending a size.
Does a panel upgrade need a permit?
Yes, in practice everywhere. In Ontario the work is declared to ESA through a notification, in British Columbia it needs an electrical permit from Technical Safety BC or the local government, and in Quebec a CMEQ member carries out the work and sends the request to Hydro-Québec. Your electrician should handle the paperwork, not you.
Will the power be off during a service upgrade?
Yes, for part of the job. The utility has to disconnect the old service and connect the new one, and circuits are moved to the new panel in between. Ask your electrician for the planned date and window so you can plan for the fridge and freezer, home heating in cold weather and any medical equipment that depends on electricity.
Can I install an EV charger without upgrading my panel?
Sometimes. Natural Resources Canada recommends having a licensed electrician determine your home's electrical capacity before a charger goes in. If there is room on the existing service, a dedicated circuit may be enough; if not, a load management device or a service upgrade may be needed.
Is adding a subpanel the same as upgrading the panel?
No. A subpanel adds breaker spaces, often in a garage, a workshop or a basement suite, but it draws on the same service. If the problem is a lack of capacity rather than a lack of spaces, a subpanel won't solve it, and the service itself has to be upgraded.
Should I upgrade my panel before or after a renovation?
Usually before or during, while walls are open and new circuits are being planned. Doing the service first means the new kitchen, suite or heating system can be connected to a panel sized for it, and the electrical inspections can follow the renovation's own schedule.
Sources
- Natural Resources Canada: Heating and cooling with a heat pump
- Natural Resources Canada: Electric vehicle charging, charger installation
- Hydro-Québec: Power grid connections and extensions for residential customers
- Hydro-Québec: Master electricians (CMEQ)
- Electrical Safety Authority: Notifications and inspections
- Technical Safety BC: Minimum requirements for upgrading electrical systems in single dwellings
- BC Hydro: Contractor authorizations and permits
Written by the LokalMatch editorial team. Reviewed by Zubair Afzal on September 10, 2026. How we write and check our guides