Looking for an electrician for a panel upgrade in Ontario, CA? Describe your project once and up to three licensed electricians who work in Ontario and San Bernardino County get back to you with a quote. It's free and there is no obligation.
Ontario is home to about 185,285 people (2024 Census Bureau estimate), a growing community (+5.7% since 2020). With 3,707 people per sq mi, it is a suburban area. Older homes with 100-amp services are upgrading for EVs, heat pumps and modern loads.
Ontario at a glance
- Population (Census Bureau estimate, 2024)
- 185,285 (+5.7% since 2020)
- Rank in California
- 25th of 482 cities and towns
- Land area
- 50 sq mi
- Population density
- 3,707 people per sq mi (suburban)
- Type
- City (Ontario city)
- Main county
- San Bernardino County
What to check before hiring in Ontario
- License and permit: in California, panel upgrades are done by licensed electricians under a permit.
- Utility: ask who schedules the disconnect and reconnect with the utility.
- Rebates: some utilities and states help fund panel upgrades for electrification.
- Price drivers: service size, meter and mast, panel location and grounding.
Useful official resources
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NFPA: National Fire Protection Association
Official information and guidance.
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ENERGY STAR
Official information and guidance.
Services available in Ontario
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Panel and service upgrade
Replacement of the electrical panel and, if needed, the service to 200 amps or more, with the permit and utility coordination.
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Unsafe panel replacement
Replacement of a fuse box or a panel brand flagged by inspectors or insurers.
Frequently asked questions in Ontario
How much does a panel upgrade cost in Ontario, CA?
It depends on the service size and the work around the meter. Describe your home: electricians who serve Ontario reply with a quote.
How long does it take?
Often a day, plus scheduling with the utility.
Is my panel dangerous?
Some older brands and fuse boxes are often flagged; an electrician can inspect it.
Which licensed electricians will contact me?
Up to three independent licensed electricians who serve Ontario and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.