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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 for the duration of the event at a time when electrification was still in its infancy. Today, we continue to build our legacy as a national leader in electrical engineering, preconstruction, electrical construction, building management systems, cutting edge electrical construction technology and methodologies, and project management. 

With four regional offices, Guarantee Electrical Company has the capability to meet any owner or contractor's project demands.   

As a member of the Federated Electrical Contractors (FEC) best practices network, Guarantee is able to provide support beyond our core regions by partnering with other electrical contractors across North America.  The FEC is an international network of leading electrical contractors dedicated to safely providing clients with the highest quality electrical and low voltage systems at competitive pricing, regardless of geographic location. 


St. Louis, Missouri
3405 Bent Avenue
St. Louis, Missouri 63116
Phone: 314.678.5400
Granite City, Illinois
1500 Grand Avenue
Granite City, Illinois 62040
Phone: 618.452.6122
Denver, Colorado
3790 Wheeling Street
Denver, CO 80239
Phone: 303.373.2400

Colorado Springs, Colorado
3450 N Nevada Ave #100,
Colorado Springs, CO 80907
Phone: 719.632.7683

Benicia, California
P.O. Box 1365
Benicia, California 94510
Phone: 707.745.7445