Security Systems Sunnyvale, CA | Locksmith | Foster Brothers Security Systems

Call Us Today!



Foster Brothers Security Systems is proud to offer a range of security products from a number of brands including Arrow, Alarm Lock, Emtek, Medeco, Von Duprin and Schlage.

Learn More »


For over 60 years, we have helped individuals and businesses with a range of security installation services including: locksmith services, door services & more.

Learn More »

About Us

We proudly serve customers across the San Francisco Bay Area with a range of services, including 24-hour emergency services.

Learn More »

Welcome to Foster Brothers Security Systems

With over 150 years of combined experience, you can count on the service technicians at Foster Brothers Security Systems. Our staff has hundreds of hours of factory certified training, and provide customers with the locks and keys, access control devices, and security systems they need and deserve. We work with some of the biggest companies in the nation, and take pride in providing all clients with professional, fast, and economical security solutions.

We proudly serve businesses and industrial sector clients across the Greater San Francisco Bay Area, and provide 24-hour emergency services. With Foster Brothers Security Systems, Silicon Valley Security Starts Here.