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Guarantee Electrical has headquarters in St. Louis, Missouri, with offices in Granite City, Illinois; Denver, Colorado; and Benicia, California. As a founding member of Federated Electrical Contractors (FEC), we have more than 30 joint venture partners operating in 60 cities across North America, Europe and Asia.
St. Louis, Missouri
3405 Bent Avenue
St. Louis, Missouri 63116
Phone: 314.772.5400
Granite City, Illinois
1500 Grand Avenue
Granite City, Illinois, 62040
Phone: 618.452.6122
Denver, Colorado
21250 East 31st Circle
Aurora, Colorado 80011
Phone: 303.373.2400
Benicia, California
P.O. Box 1365
Benicia, California 94510
Phone: 707.745.7445

Founded in 1902, Guarantee Electrical first showed the world what electricity could do by illuminating the 1904 World’s Fair, and then “guaranteeing” that it would work when electrification was in its infancy. Today, we continue to build on our legacy as a national leader in electrical engineering, preconstruction, construction, technology and project management.
Our Offices
St. Louis MO
Granite City IL
Denver CO
Benicia CA
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