
Panel Upgrades & Rewiring
200-amp service upgrades, fuse box replacement and whole-home rewiring, permitted and inspected.
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APEX Electric is based in O'Fallon, which means the shortest response time we offer anywhere is right here. We cover residential service across 63366 and 63368 and commercial work throughout the city's business corridors.
O'Fallon's housing stock spans a wide range, and the electrical needs split along those lines. Homes built through the 1970s and 80s in the older neighbourhoods near Main Street commonly still run 100-amp services with original panels, and they are the ones where a load calculation matters most before adding an EV charger or finishing a basement. The newer subdivisions out toward WingHaven and Dardenne Prairie were built with 200-amp services, and the work there is more often about adding capacity for what the builder left out — a garage circuit, a hot tub, a workshop.
On the commercial side, the corridor along Highway K and the WingHaven business district keep us busy with tenant build-outs, lighting retrofits and service upgrades. We schedule occupied-building work after hours as a matter of course, because a retail bay or a medical suite cannot lose a trading day to an electrical panel.
Permitting runs through the City of O'Fallon, and we meet the inspector ourselves. Being local means we know how that office schedules and what it wants to see, which is usually the difference between one inspection and two.
Everything we do for homeowners across O'Fallon, MO — quoted at a fixed price, permitted where the code requires it.

200-amp service upgrades, fuse box replacement and whole-home rewiring, permitted and inspected.
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Level 2 home charging installed on a dedicated circuit, sized by a real load calculation.
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Automatic standby generators and transfer switches so the house rides through an outage.
Learn moreBuild-outs, retrofits and maintenance for O'Fallon facilities, scheduled around your trading hours.

Tenant build-outs, service upgrades and scheduled maintenance for offices, retail and restaurants.
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LED retrofits for offices, warehouses and parking lots, with the rebate paperwork handled.
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Power distribution, motor controls, VFDs and PLC integration for plants and logistics.
Learn moreWhat people in O'Fallon, MO ask us before booking.
No. O'Fallon is inside our standard service area — it is where we are based. Estimates are free and there is no travel surcharge.
For genuine emergencies — burning smells, sparking, a dead service — we aim for same-day and keep after-hours availability. Planned work such as a panel upgrade or an EV charger is usually scheduled within the week.
Yes. The electrical permit is pulled with the local authority having jurisdiction and we meet the inspector ourselves. Being local means we know how each office schedules and what it expects to see.
Yes. Residential work is scheduled around your household with a fixed quote up front; commercial work is scheduled around your trading hours, generally after hours, and delivered against your occupancy date.
We cover 63366, 63368 and the surrounding St. Charles County area. If you are just outside, call anyway — the boundary is not rigid.
Free estimates across O'Fallon, MO. Tell us what is going on and we will tell you what it needs and what it costs.
Send the details of your O'Fallon job and we will come back the same business day.
The fastest way to get an estimate is a phone call. Tell us what is going on and we will tell you what it needs, what it costs and when we can be there.
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Would rather just talk to someone? Call (660) 342-5886 — for anything urgent that is the fastest route.