12 miles from our shop in San Dimas. Ontario is a city of extremes — century-old Craftsman bungalows along Euclid Avenue, 47,000 planned homes in Ontario Ranch, and 650 warehouses moving freight for the entire western United States. We handle all of it.
Ontario's housing stock spans a full century, and the electrical panels tell the story. Downtown homes along Euclid Avenue and the grid streets south of Holt Boulevard were built in the 1920s through 1950s with 60-amp fuse boxes that were designed for a radio, a few lights, and maybe a window fan. Mid-century ranch homes in North Ontario from the 1960s and 70s typically have 100-amp breaker panels — better, but still inadequate for modern air conditioning loads, EV chargers, and home offices. We upgrade to 200A and 400A panels, pull the permit through Ontario's Building and Safety Division, and handle the SCE meter coordination so you are not stuck waiting on the utility.
Ontario sits at the crossroads of the I-10 and I-15 — two of the busiest freeways in California — and its residents are switching to electric vehicles fast. For older homes in Downtown Ontario and North Ontario, installing a Level 2 charger almost always requires a panel upgrade first because the original 60-100 amp panel cannot support the dedicated 50-amp circuit a home charger needs alongside your existing AC and appliance loads. For new homes in Ontario Ranch, the conduit and circuit pathway are already in place per Title 24, but the builder did not install the actual charger or termination. We handle both scenarios: full panel upgrade plus charger install for older homes, or finishing what the builder left incomplete in new construction.
Downtown Ontario's Craftsman bungalows and Spanish Revival homes from the 1920s and 1930s were wired with knob-and-tube or early cloth-insulated wiring — insulation that crumbles after 80-plus years, leaving bare copper conductors against wood framing. Homes built in the 1960s through early 1970s in North Ontario often have aluminum branch-circuit wiring, which the CPSC found is 55 times more likely to reach fire-hazard conditions at connections. We inspect every connection and give you a straight answer: pigtail with COPALUM connectors if the aluminum is in decent shape, or full copper rewire if it is not. For the historic homes along Euclid Avenue, we run new wiring through existing wall cavities without destroying plaster walls or original woodwork.
Ontario Ranch is the largest master-planned community in Southern California — 8,000 acres, 47,000 planned homes, and the region's first gigabit-connected community with fiber-optic infrastructure built in from the ground up. New homes here come pre-wired with CAT6 cabling and are built to California's 2022 Title 24 energy code, which requires solar-ready roofs, EV-ready circuits, and battery storage infrastructure with a minimum 225-amp busbar. We work with Ontario Ranch homeowners to finish what the builder started: installing the actual EV charger, connecting solar and battery systems, adding dedicated circuits for home offices and workshops, and wiring smart home devices like automated lighting, motorized shades, and whole-house audio to the structured wiring that is already in your walls.
Ontario has 650 warehouses covering 222 million square feet — more than any other city in the Inland Empire. Amazon's largest fulfillment center in the world is here, a 4.1-million-square-foot facility near Ontario International Airport. We provide industrial electrical services for warehouses, distribution centers, and manufacturing facilities: 3-phase power installations, 480V disconnects, motor connections, high-bay LED lighting retrofits, dock door electrical, conveyor power feeds, and heavy-duty conduit runs. For commercial tenants near Ontario Mills and along the Fourth Street corridor, we handle tenant improvement electrical, retail buildouts, and restaurant kitchen wiring.
We are 12 miles east on the I-10 in San Dimas — about 19 minutes door to door. When a breaker will not reset in your downtown Ontario home, when a warehouse forklift charger trips the main disconnect, or when a Santa Ana windstorm takes out a service drop in North Ontario — call us any time. Ontario's summer heat regularly pushes past 100 degrees during heat waves, and old panels in homes south of Holt Boulevard were never built to handle the sustained AC loads that this inland valley climate demands. We have seen after-hours calls from Ontario spike every year from June through October.
Ontario is not one city — it is three. There is the historic core along Euclid Avenue and downtown, where Craftsman bungalows, Spanish Revival homes, and early ranch houses from the 1920s through 1960s sit on tree-lined streets with electrical systems that have not been touched in 60 to 100 years. There is Ontario Ranch to the south, where 47,000 homes are planned with fiber-optic infrastructure, solar-ready panels, and smart home wiring — but where homeowners quickly discover that "ready" does not mean "finished." And there is the industrial corridor around Ontario International Airport and the I-10/I-15 interchange, where 650 warehouses and distribution centers need 3-phase power, 480V disconnects, and high-bay lighting that never fails.
We work across all three. We understand what is behind the walls in a 1930s bungalow on Laurel Avenue, and we know what Title 24 requires in a brand-new KB Home in Ontario Ranch. We are based in San Dimas — 12 miles, 19 minutes, straight down the 10. Ontario is one of the fastest-growing cities in Southern California with over 182,000 residents, and the electrical work here reflects that growth. From rewiring century-old homes to finishing smart home installations in new construction to powering the largest warehouse complex in North America — we do not guess. We know Ontario.
Ontario was founded in 1882 by the Chaffey brothers, who laid out Euclid Avenue as the grand seven-mile boulevard at the heart of their model colony. That means Ontario has homes from nearly every era of residential construction in California. The 1920s and 1930s bungalows along Euclid and downtown have knob-and-tube or early cloth-insulated wiring. The 1950s and 1960s ranch homes in North Ontario have aluminum branch-circuit wiring and undersized panels. The 1970s and 1980s tracts often have Federal Pacific Stab-Lok panels that independent testing has shown fail to trip during overcurrent. And the brand-new homes in Ontario Ranch have modern wiring but incomplete installations. Every era has its own electrical problem, and we have seen all of them. If your Ontario home was built before 1980, get the electrical system inspected — the wiring and the panel.
If you bought a new home in Ontario Ranch, you were probably told it is "solar-ready" and "EV-ready." Here is what that actually means under California Title 24: the builder installed a minimum 225-amp busbar, ran conduit pathways for future solar and battery connections, designated a circuit for EV charging, and identified four backed-up circuits for a future battery storage system. But no solar panels were installed. No battery was connected. No EV charger was mounted. The builder met the code minimum by installing infrastructure — not equipment. We finish the job. We install the actual Level 2 charger on the EV-ready circuit, connect solar panel systems to the pre-wired infrastructure, wire battery storage to the designated backed-up circuits, and add any additional dedicated circuits your home needs. One electrician, one permit, everything done right.
Ontario sits in the inland valley, 40 miles from the coast. There is no marine layer to cool things down in the afternoon the way there is in Santa Monica or Long Beach. Summer highs regularly exceed 95 degrees and heat waves push past 105. Your air conditioning is running hard from May through October — five full months of sustained electrical load that homes built before the 1980s were simply not designed for. A 3-to-5-ton AC unit draws 30 to 40 amps on its own. Add in your kitchen appliances, washer and dryer, water heater, and a home office, and a 100-amp panel is at its limit before you even think about an EV charger. Ontario homes need 200-amp panels as a baseline, and homes with solar, battery storage, and EV charging should be looking at 400-amp service. We see more breaker trips and panel overheating calls from Ontario between June and September than any other time of year.
We are 19 minutes away in San Dimas. Call for a free assessment on any residential, commercial, or industrial electrical project in Ontario — from a 1920s rewire on Euclid Avenue to a warehouse buildout near the airport.
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