A sub-panel provides another place for circuits. A service upgrade increases the home’s incoming electrical capacity. They solve different problems, so a full panel does not automatically mean you need a larger service.
What does a sub-panel do?
A sub-panel distributes power to a group of circuits, such as a garage, workshop or renovation area. Its supply still comes from the existing electrical system. Adding one does not turn a 100-amp service into a 200-amp service.
What does a service upgrade change?
A service upgrade changes the capacity of the incoming supply, with the required equipment and utility coordination. Replacing an old panel at the same service rating is a different scope. Ask your quote to name the proposed service size and exactly which equipment is included.
My panel has empty spaces. Is there enough capacity?
Empty breaker spaces are not proof of spare capacity. Your electrician must consider existing demand and planned additions. Conversely, a panel with no spare spaces may still have service capacity available, but need a suitable circuit-space solution.
How is the right option decided?
Give the electrician your existing equipment list and future plans: EV charging, a heat pump, a suite or a hot tub. BC Hydro’s electrical-capacity guidance explains why an assessment comes before choosing an upgrade. Equipment condition and practical wiring routes also affect the scope.
Could load management help?
For a suitable EV installation, EV load management may help fit charging within the available capacity. It does not add circuit spaces or increase the service rating. Discuss compatibility and your charging needs before choosing equipment.
What should I ask for in the estimate?
Ask whether the problem is equipment condition, circuit space, service capacity or a combination. Request separate descriptions for panel work, service work, permits, utility arrangements and restoration. Compare the recommended solution against your actual plans.
See Hundel’s panel upgrades and electrical service upgrades. For several upcoming appliances, read our combined electrification planning guide. Call 604-358-5549 to discuss your Lower Mainland home.