Why Choose Us
Dedicated to Quality and Reliability
01
New Commercial Lighting Installs
Get code-compliant interior and exterior lighting designed for your facility’s workflow and safety. We handle design-build, fixture selection, controls, and clean installs—so your business opens brighter and on schedule.
02
Upgrades & LED Retrofits
Cut energy costs and boost visibility with LED retrofits and modern controls. We replace outdated fixtures, improve uniformity, and meet egress/emergency codes—minimal downtime, measurable savings, better light.
03
Repairs & Preventive Maintenance
Keep operations safe and productive with fast repairs and scheduled maintenance. From ballast/driver failures to circuit issues and parking lot pole service, we troubleshoot, fix, and document—done right the first time.
Commercial Electrical Solutions
At Electrical Services Unlimited, Inc. we promote quality and practical electrical construction, which responds to the increasingly Code complex and precise needs of our clients.
We provide excellent workmanship, with qualified and courteous technicians, at competitive rates. We hold a South Carolina mechanical contractors license and we are insured and bonded.
We supply our South Carolina commercial and business clients with a full range of electrical work, including new design/build projects, inspections, repairs, remodels, and upfits.
About Our Company
Who We Are
Founded in 1975 by retired CEO, Charles Hamilton, and retired COO, Lynn Hamilton, Electrical Services Unlimited brings quality, reliable, and professional Commercial Electrical Services to the Greenville, South Carolina area.
Under new direction from current CEO, Travis Gregg, our growing team continues the mission, from decades ago, to provide high quality commercial electrical service to South Carolina.
50+ Years in Business
Since 1975
Comprehensive Solutions for Your Home
01
New Installation & Repairs
Code-compliant commercial installs and fast troubleshooting—design-build, tenant upfits, additions, and fixes done right.
02
Interior & Exterior Lighting
LED installs and retrofits for offices, retail, and warehouses—clean work, permits handled, better light and lower costs.
03
Emergency & Egress Lighting
Exit signs, emergency heads, testing, and documentation—NFPA/IBC compliant and audit-ready.
04
Warehouse & Facility Maintenance
Scheduled preventive maintenance and quick repairs to minimize downtime—panels, circuits, labeling, and safety checks.
05
Generators & Automatic Transfer Switches
Reliable backup power—proper sizing, installation, and maintenance for generators and ATS systems.
06
Power Distribution (Switchgear, Panelboards & Load Centers)
Safe, scalable distribution—upgrades, new gear, and maintenance to keep your facility powered and compliant.
Commercial Electrician Services
At ESU, you will find quality electricians to meet all your Commercial and Business needs.
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Professional Electrical Services
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Lighting
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Facility Power Systems
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Site & Recreational Lighting
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Switchgear
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Transformers
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Load Centers
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Panelboards
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Surge Protection Devices
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Standby Generators
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Automatic Transfer Switches
Projects Gallery
See Our Work in Action
FAQ
Frequently Asked Questions
Trusted by Greenville Businesses ⭐⭐⭐⭐⭐
Real Results from Commercial Clients
From offices to retail and warehouses, local facility managers choose ESU for code-compliant work, clean job sites, and dependable timelines. Read what Greenville businesses say about our lighting upgrades, power distribution, and maintenance.
