What size electrical panel do I need for my house?
What size electrical panel do I need for my house?
Most modern homes need a 200-amp electrical panel, while older homes with basic electrical needs may function adequately with 100 amps. However, the right size depends on your home's square footage, electrical appliances, and future plans like EV chargers or hot tubs.
Calculating Your Electrical Load
The Ontario Electrical Safety Code requires specific calculations to determine proper panel sizing. A licensed electrician performs a load calculation that considers your home's heated square footage, major appliances, and planned additions. For a typical 1,500 square foot home with standard appliances (electric range, dryer, air conditioning), you're looking at roughly 150-180 amps of calculated load, making a 200-amp panel the safe choice.
When 100 Amps Might Be Sufficient
Smaller homes under 1,200 square feet with gas heating, gas water heater, and no major electric appliances might operate fine on 100 amps. However, this leaves little room for growth. Adding an EV charger (typically requiring a 40-50 amp circuit) or central air conditioning often pushes you over 100 amps capacity. Many insurance companies and mortgage lenders also prefer seeing 200-amp service in modern homes.
Why 200 Amps Is Usually Better
A 200-amp panel provides flexibility for modern electrical demands. You can add EV chargers, hot tubs, workshop circuits, or upgraded HVAC systems without immediately needing another panel upgrade. The cost difference between installing 100-amp versus 200-amp service is relatively small - typically $300-500 more for the 200-amp option - making it worthwhile future-proofing.
Ottawa-Specific Considerations
In Ottawa's climate, many homes rely heavily on electric heating or heat pumps during winter, significantly increasing electrical load. ESA inspectors frequently see undersized 100-amp panels struggling with modern demands. A panel upgrade from 100A to 200A typically costs $2,000-3,500 in Ottawa, including permits and ESA inspection.
Safety Warning: Professional Assessment Required
Never guess at electrical panel sizing - undersized panels create fire risks and code violations. Only ESA-licensed electricians can legally perform load calculations and install panels in Ontario. DIY electrical work voids insurance and violates provincial law.
Next Steps
Contact a licensed electrician for a proper load calculation specific to your home. They'll assess your current usage, planned additions, and ensure compliance with Ontario Electrical Safety Code requirements. For a free consultation on panel sizing for your Ottawa home, Electrical Ottawa's ESA-licensed electricians can provide accurate load calculations and upgrade estimates.
---
Find a Electrical Contractor
Electrical Ottawa connects you with experienced contractors through the https://justynrookcontracting.com:
View all electrical contractors →Electric IQ — Built by a licensed contractor with 20+ years in the field. Powered by AI with strict guidelines and real building knowledge.
Ready to Start Your Project?
Get a free, no-obligation estimate for your Ottawa electrical project. Our team at Ottawa Electrical is ready to help.