Already Have A Security System?
Office and Home Security Monitoring
If you already have a residential or office security system, Sentry Installation offers alarm monitoring and service most major manufacturer’s security systems. Our security system technicians will come to your house or office and perform a detailed security system assessment for commercial or residential residents in the Washington DC Metro area, as well as customers in Northern Virginia, and Prince George’s County and Montgomery County in Maryland .
Our security professionals will inspect your residential or commercial alarm system, reprogram your system to our LOCAL central station, and give you 3 months of office or home monitoring at no charge.* Optionally, you can upgrade your existing security system to the latest burglar alarm technology by selecting one of our Security Components for your home. At Sentry Installation, we are an authorized First Alert Professional and Honeywell security systems dealer.
Whether our security services were recommended by a neighbor, you’re unsatisfied with your current security service company, or you’re just looking for a new security service provider, Sentry Installation, Inc. can handle your home or business monitoring needs. Our security company has been in business since 1982 and have a long history of superior customer service.
For existing security systems we offer:
- Office or Home Monitoring – Our local central security monitoring station provides you with burglar protection 24 hours a day, 7 days a week, 365 days a year. Their cutting edge central monitoring service makes sure your house or business is always protected.
- Security System Service – From time to time it may be necessary to service your security systems. Sentry Installation, Inc. doesn’t just leave you alone after installation. We are always here to solve any alarm system service needs that may arise. We also offer service agreements which can become part of your monthly commercial or residential monitoring fee.

Tell us you saw us on the web and receive 3 months of free home monitoring!*
* Parts may be additional
For more information about Sentry Installation’s security system servicing, business security monitoring, and home monitoring services, feel free to contact us through our website or call our office at 800-670-1008.