Home | Fire Alarm Systems | Services | Request an Estimate | Refer a Friend | Contact Us 7879 Cessna Avenue, Gaithersburg, MD 20879 Phone: 301.948.0101 | Fax: 301.948.0050 | Contact@ESSI-Ltd.com Covenant Life Church | 92,000 SF Addition Comprising administrative offices, mezzanines, a main lobby area, 18 classrooms and an auditorium We are a full-service electrical contractor providing quality service to marine, commercial, industrial, and residential clients in the greater Washingon DC - Annapolis and Baltimore, MD - Northern Virginia area. From remodeling to new construction, from a high-tech office to a living room in a historical property, our licensed electricians and expert technicians are dedicated to working with you to implement a solution that meets your needs. We are fully licensed and insured in MD, VA and The District of Columbia. Our services include: Marine Electrical Wiring and Repairs New Electrical Construction Renovation and Tenant Fit-Out Preventive Maintenance and Repairs 24-Hour Emergency Service Fire Alarm System Sales and Service Computer Cabling | LAN Wiring Control Wiring Parking Lot Lighting - Installation and Repair CAD Design We provide FREE ESTIMATES...give us a call or fill out the form on the Request an Estimate page. We are proud members of the following organizations: Local 26, IBEW NFPA Join Our Mailing List! By joining our mailing list, you will be the first to know about: Breaking news about our business Helpful tips Exclusive special offers To join, type your email address below and then click the Submit button. Your email address: