Commercial Electrical Panel Upgrades in North Texas

A commercial electrical panel upgrade is the process of replacing or expanding a business's main electrical panel or adding a subpanel to increase electrical capacity, restore safe operation, and support current and future power demands of a commercial facility.

Commercial panel upgrades are fundamentally different from residential panel work in scope, complexity, and code requirements. Commercial facilities operate at higher voltages, larger amperages, and frequently on three-phase power systems that require specialized knowledge, larger equipment, and more rigorous permitting than residential installations.

For Fort Worth businesses; offices, retail spaces, daycares, restaurants, warehouses, etc... an undersized or failing electrical panel is not just an inconvenience. It is a direct constraint on business operations, a safety liability, and in many cases an insurance and code compliance issue.

S&M Electric handles commercial panel upgrades for businesses from West Fort Worth to Weatherford. We ensure load-calculations, properly permitted, and installed to NEC commercial standards.

Commercial vs. Residential Panels — Key Differences

What makes a commercial electrical panel different from a residential one?

	Residential Panel	Commercial Panel
Voltage	120/240V single-phase	120/208V or 277/480V — often three-phase
Amperage range	100–400 amps	200–1,200+ amps
Wiring method	NM cable (Romex)	Conduit-based — EMT, IMC, or rigid metal
Wire insulation	Standard plastic sheathing	THHN/THWN — heat and chemical resistant
Circuit complexity	Single or dual-phase circuits	Single, dual, and three-phase circuits
Code standard	NEC residential articles	NEC Articles 408, 220, 250 — commercial
Load calculation	Standard residential formula	Detailed engineering load study required
Typical project timeline	1–2 days	1–4 weeks depending on scope and utility
Bottom line	A contractor experienced in residential panel work is not automatically qualified for commercial panel upgrades. The code requirements, equipment specifications, and load calculation methodology are substantively different — and the consequences of getting them wrong are measured in business downtime and failed inspections.

For Fort Worth businesses, this distinction matters: a contractor experienced in residential panel work is not automatically qualified for commercial panel upgrades. The code requirements, equipment specifications, and load calculation methodology are substantively different.

8 Signs Your Business Needs a

Panel Upgrade

1. Breakers Trip Repeatedly Under Normal Business Load

If your team is regularly resetting breakers or if specific circuits trip when multiple pieces of equipment run simultaneously your panel is either undersized for your current load or has failing components. In a commercial setting, repeated breaker trips mean operational disruptions that cost more than the upgrade.

2. You're Running Extension Cords as a Permanent Solution

Extension cords in a commercial environment are a symptom of insufficient circuit capacity and in most commercial spaces, they are a fire code and OSHA violation when used as permanent wiring substitutes. The right solution is additional circuits from an appropriately sized panel.

3. You've Added Equipment or Staff Since the Building Was Last Upgraded

Computers, servers, copiers, kitchen equipment, HVAC upgrades, LED lighting retrofits, EV chargers and every addition to your business adds electrical load. A panel sized for your operation five years ago may be at or past capacity today. Electrical load grows with the business; the panel needs to keep pace.

4. You're Planning a Renovation or Build-Out

Any significant tenant improvement or renovation that adds new circuits, new HVAC, or new equipment requires a load assessment before work begins. In many cases, the existing panel needs to be upgraded to support the renovation's electrical additions and that needs to be planned and budgeted before walls are opened.

5. Your Panel Is More Than 25 Years Old

Commercial panels have a functional lifespan of 25 to 40 years under normal conditions; shorter in environments with heat, humidity, or heavy cycling loads. Older panels may have failing breakers, corroded terminals, or outdated specifications that don't support modern electrical demands or current NEC requirements.

6. You're Adding EV Charging for Fleet or Customers

Commercial EV charging infrastructure whether for employee vehicles, fleet charging, or customer-facing chargers adds significant amperage demand. Level 2 commercial chargers draw 40 to 80 amps each. Multiple chargers require careful load planning and in most cases a panel upgrade or dedicated subpanel.

7. Your Insurance Has Flagged Your Electrical System

Commercial insurers increasingly scrutinize electrical panel condition during policy renewals particularly for older buildings or facilities with outdated equipment. A panel that fails inspection creates coverage gaps that leave your business exposed.

8. You've Had a Fire, Flood, or Major Surge Event

Any significant electrical event, a fire in or near the panel, flooding that reached electrical components, or a major lightning-related surge warrants a full panel assessment before continuing operations. Damage may not be externally visible but can compromise the panel's ability to protect the facility.

Single-Phase vs. Three-Phase Power — What Does Your Business Need?

Most Fort Worth small businesses operate on single-phase power, the same voltage configuration as residential service, delivered at higher amperage to support greater loads. Single-phase service is appropriate for offices, retail spaces, restaurants, daycares, and most small commercial facilities.

Three-phase power delivers electricity through three alternating current waves that are offset by 120 degrees producing significantly higher capacity, more efficient motor operation, and smoother continuous power delivery. Three-phase service operates at 120/208V or 277/480V depending on configuration.

Three-phase service is appropriate for facilities with:

Large HVAC systems or industrial chillers
Commercial kitchen equipment with three-phase motors
Manufacturing or fabrication equipment
Warehouses with heavy-duty material handling equipment
Multiple simultaneous high-draw loads

Converting from single-phase to three-phase service requires utility coordination with Oncor and typically adds $10,000 to $30,000 to project cost depending on distance from the nearest three-phase line. We assess whether your facility's load profile actually requires three-phase power or whether a properly sized single-phase upgrade meets your needs.

Main Panel Upgrade

vs. Subpanel Addition

Which Does Your Business Need?

The right solution depends on where the capacity limitation actually exists:

Main panel upgrade is needed when:

The main panel's amperage rating is insufficient for total facility load
The panel is aging, damaged, or has known safety concerns
Utility service entrance capacity needs to increase
The panel is at capacity with no available breaker slots

Subpanel addition is appropriate when:

The main panel has adequate total capacity but insufficient breaker slots
A specific area of the facility needs dedicated electrical capacity — a new office suite, a kitchen expansion, a charging station area
The load needs to be distributed to reduce conduit run lengths to remote areas of a large facility
A specific piece of equipment needs its own dedicated power source close to its location

In many Fort Worth commercial renovations and expansions, a subpanel added in the new or renovated area — fed from an adequately sized main panel — is the more cost-effective and operationally practical solution. We assess and recommend the correct approach based on your specific facility load and layout.

What the Commercial Panel Upgrade Process Looks Like

Step 1 — Commercial Load Study

Unlike residential panel work which uses a standard calculation formula, commercial panel upgrades require a detailed load study that accounts for all existing equipment, planned additions, demand factors, and future growth. We calculate actual peak demand, not just connected load, to size the panel correctly for your operation.

Step 2 — Utility Coordination

Significant commercial service upgrades require coordination with Oncor to increase service entrance capacity. This process, including Oncor's review, scheduling, and service work adds lead time to commercial projects and needs to be initiated early. We manage this coordination as part of the project.

Step 3 — Permitting

Commercial electrical work requires permits from the City of Fort Worth or the relevant jurisdiction. Commercial permits involve more documentation than residential permits (IE: load calculations, equipment specifications, and in some cases engineered drawings). We handle the permit application and coordinate inspections.

Step 4 — Phased Installation

Most commercial panel upgrades are phased to minimize business disruption. We work with your operations schedule to plan power outages during off-hours or low-activity periods and restore power to critical systems before moving to non-critical areas.

Step 5 — Inspection and Documentation

All commercial electrical work is inspected by the City of Fort Worth's electrical inspector. We coordinate inspections, address any required corrections, and provide complete documentation of the permitted and inspected work for your facility records and insurance file.

Why Fort Worth Businesses From West Fort Worth to Weatherford Choose S&M Electric

Commercial Load Calculations — Not Guesswork

We size commercial panels based on actual load studies not residential formulas applied to commercial spaces. An undersized commercial panel creates ongoing operational problems. An oversized installation wastes capital. We get the sizing right.

Utility Coordination Included

Oncor coordination for commercial service upgrades is not optional and is not something to figure out after the project starts. We initiate utility contact as part of the project planning process not as an afterthought when the panel is already on order.

Minimal Business Disruption

Commercial panel work that shuts down a business for a full day costs more than the electrical work itself in lost revenue. We plan the installation sequence, coordinate off-hours work where needed, and stage the job to keep your facility operational throughout.

Code-Compliant Commercial Work

Commercial electrical code requirements differ substantially from residential. NEC Articles 408, 220, and 250 govern commercial panel installations. We work to these standards every time, producing work that passes inspection the first time.

Licensed, Insured, and Guaranteed

TECL# 40674. Fully insured for commercial work. Our work is guaranteed if something isn't right, we make it right.

Commercial Panel Upgrade FAQs — Answered Straight

How much does a commercial electrical panel upgrade cost in Fort Worth?

Commercial panel upgrade costs in Fort Worth vary significantly more than residential projects due to amperage requirements, three-phase vs. single-phase service, utility coordination scope, and facility-specific conditions. General ranges: a 200-amp single-phase commercial upgrade typically runs $3,000 to $6,000. A 400-amp service runs $5,000 to $10,000. Three-phase service upgrades or large-amperage industrial installations can range from $15,000 to $50,000+ depending on scope and utility coordination requirements. We provide specific written proposals after a site assessment and load study.

Phone quotes on commercial panel work are not reliable.

How long does a commercial panel upgrade take?

The on-site installation for most small to mid-size commercial panel upgrades takes 1 to 3 days. However, the full project timeline including load study, permitting, Oncor coordination, and inspection typically runs 2 to 6 weeks from initial assessment to final approval. Utility coordination is the most common timeline constraint for service entrance upgrades. We provide a realistic project timeline during the proposal phase.

Does my business need to shut down during a panel upgrade?

Not necessarily and not for the entire project. We phase the work to minimize disruption, schedule power interruptions during off-hours or low-activity periods, and restore power to critical systems before moving to non-critical areas. For businesses where any power interruption is unacceptable, temporary power solutions can be arranged. We discuss operational constraints during the planning phase and design the installation sequence around your business needs.

Do I need three-phase power for my Fort Worth business?

Most Fort Worth small businesses (offices, retail, restaurants, daycares, etc...) operate effectively on single-phase power at adequate amperage. Three-phase service is specifically needed for large HVAC systems, industrial motors, manufacturing equipment, and facilities with very high simultaneous loads. Converting from single-phase to three-phase when it isn't operationally required is a significant unnecessary expense. We assess your actual load profile and equipment specifications before recommending service type not based on what's easier to install.

What permits are required for a commercial panel upgrade in Fort Worth?

All commercial electrical work in Fort Worth requires a permit from the City of Fort Worth Development Services Department. Commercial permits require load calculations and equipment specifications. Significant service entrance upgrades also require Oncor coordination and may require engineer-stamped drawings depending on project scope. We handle all permitting as part of the project. Unpermitted commercial electrical work creates insurance, code compliance, and resale liability that far exceeds the cost of proper permitting.

Can I add an EV charging station for my business without upgrading the panel?

It depends entirely on your panel's current capacity and existing load. A single Level 2 commercial charger draws 40 to 80 amps on a dedicated circuit. If your panel has available capacity, a charger can often be added without a full panel upgrade. Multiple chargers, DC fast chargers, or fleet charging installations almost always require either a panel upgrade or a dedicated subpanel with load management. We assess your panel and provide honest options for your specific charging goals.

My commercial space is leased — who is responsible for panel upgrades?

Responsibility depends on your lease terms. In most commercial leases, the landlord is responsible for the building's base electrical service and main panel. Tenant improvements including circuit additions, subpanels, and equipment-specific electrical work within the leased space are typically the tenant's responsibility. We can review your specific situation and provide documentation for landlord conversations about shared infrastructure upgrades.

Your Panel Is Either Keeping Up With Your Business — or It Isn't.

An undersized commercial panel doesn't fail dramatically. It fails gradually as tripped breakers, limited capacity, equipment that can't run simultaneously, expansion plans that stall because the electrical system can't support them.

The right panel upgrade removes that ceiling. It's infrastructure that pays for itself in operational reliability and the ability to grow without electrical constraints.