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Modern open-plan commercial office interior
Commercial service

Commercial Electrical Contracting

Commercial electrical work is judged on schedule and on downtime. APEX Electric handles tenant build-outs, service upgrades and ongoing maintenance for offices, retail, restaurants and multi-tenant buildings across St. Charles County — working around your hours when the space has to stay open.

Build-outs delivered against the schedule

A tenant improvement lives or dies on the certificate of occupancy date. We build the electrical schedule backwards from it — permit, rough-in, inspection, trim, final — and tell you early when another trade is going to put that date at risk rather than on the day it slips.

That includes the parts of the job that are easy to leave until too late: the utility coordination, the fire alarm interface, the emergency and exit lighting, and the inspections that gate occupancy.

Service and distribution upgrades

Buildings change use. An office becomes a medical suite, a retail bay becomes a restaurant, a warehouse takes on production equipment. The existing service is rarely sized for it.

We perform the load study, coordinate with Ameren on the service change, and stage the work so the occupied portions of the building keep running. Where a full shutdown is unavoidable, we schedule it overnight or on a weekend.

Maintenance that prevents the call-out

Most commercial electrical emergencies announce themselves months in advance as a warm connection or a nuisance trip. Thermal imaging of panels and switchgear on a scheduled interval finds them while they are still cheap.

We offer scheduled maintenance agreements covering panel inspection, thermal scanning, emergency and exit light testing, and documented corrections — the same documentation your insurer and your fire marshal will ask for.

What this covers

  • Tenant improvements & build-outs
  • Service & distribution upgrades
  • Panel, feeder & switchgear work
  • Restaurant & kitchen equipment circuits
  • Retail & office lighting
  • After-hours and weekend scheduling

Available across O'Fallon, St. Charles, St. Peters, Wentzville and the rest of St. Charles County.

(660) 342-5886
Questions

Commercial Fit-Out & Service
questions.

The things people ask us most about this work.

Yes. Most of our occupied-building work happens evenings, overnight or on weekends specifically so the space keeps operating during business hours.

Yes. We carry commercial general liability and workers' compensation coverage, and we can provide certificates of insurance naming your property manager or landlord as required.

We pull the electrical permit and manage the electrical inspections. On a larger build-out we coordinate with the general contractor's permit package.

Yes. We will assess what has been installed, document what does and does not meet code, and give you an honest scope to finish it correctly.

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Need commercial fit-out & service?

Tell us what you are working with. We will give you a fixed price and a date, at no charge.

Get started

Get a quote for commercial fit-out & service

Send the details and we will come back the same business day.

Call us(660) 342-5886
Office
105 Hawks Haven Dr.O'Fallon, MO 63368By appointment — we come to you for estimates.
Hours
Monday – Friday7:00 AM – 6:00 PMSaturdayBy appointmentEmergency service24 / 7
Emergencies
Burning smell, sparking, a dead service or water near electrical equipment — call the main number any hour.
Service area
O'Fallon · St. Charles · St. Peters · Wentzville · Lake Saint Louis · Cottleville · Dardenne Prairie · Chesterfield
Get in touch

Call or email us

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.

Helpful to include

  • What is happening, and roughly when it started
  • Home or business, and the town
  • A photo of the panel or the problem
  • When you are usually available
Monday – Friday: 7:00 AM – 6:00 PM. Emergency service available 24/7 — call the main number any hour.

Would rather just talk to someone? Call (660) 342-5886 — for anything urgent that is the fastest route.