About Us

Cornerstone Electrical Services, LLC was established in 2006 and is owned and operated by Josh Martinez and Ed McGrath.


Our Story

Providing Electrical Services Since 2006

Josh Martinez began his electrical career working for commercial and industrial contractors in Florida. He learned quickly and was soon running jobs. He moved with his family to Connecticut and has worked on many commercial jobs in Connecticut such as the ConnectiCare headquarters, Walgreens facility in Windsor Locks, several high schools, and medical office buildings. He also has extensive residential electrical experience with remodel work and new work.

Ed McGrath was born and raised in Connecticut and currently lives with his family in Hartford county. Ed started his electrical career in 1997 working for a commercial electrical company. He started running commercial projects when he got his license in 2001 such as ECHN, Hartford Hospital, and Connecticut Children’s Medical Center. Ed has vast experience in old work and new work residential and commercial electrical services.

Electrical Services

Providing a Range of
Commercial, Industrial & Residential Services

This is a small example of what we offer to our customers.

We are an owner operated electrical contracting company. We pride ourselves in offering quality, professional service.

Service Change

There are many reasons to upgrade the electrical panel in your house. One issue could be needing more circuits but not having anymore room in the panel for more circuits. 


Industrial Electrical

All aspects of industrial electrical services - replace/upgrade machinery wiring, wiring for new machinery, etc...


Commercial Electrical

We can handle all aspects of commercial electrical services. New work and repair. We offer service contracts as well.


Residential Services

All aspects of residential electrical services - service upgrade, remodels, generator installations, new construction, etc...


394 Riverside Ave
Bristol, CT 06010


(860) 325-0179