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Security Solutions & Services

Foster Brothers Security Systems is proud to serve the Greater San Francisco Bay Area with a range of security services and solutions. Our technicians have over 150 years of combined experience, and hundreds of hours of factory-certified training. We pride ourselves on finding the right solutions for our customer needs and for our focus on affordable security products, and quick services.

We have served families, businesses, and industrial clients for over 60 years, and offer 24-hour emergency service, 365 days a year.

We are proud to offer the following services:


  • High-Security Locks And Keys
  • Modular Furniture Key Service
  • Key Control Solutions
  • Locks Re-keyed
  • Master Key Systems
  • Key Duplication


  • Fire/Life Safety And ADA Experts
  • Certified Fire Door Inspections
  • Door Hardware Installation
  • Door Repair
  • Fire Door Repair
  • Door Hardware Repair
  • Door Closer Installation


  • On-Site Fire Re-certification
  • Sales, Services, and Installation
  • Wireless Access Control Products


  • Safe Combo Change
  • Safe Key Duplication
  • Fire King Service and Repair
  • Safe Manipulation
Locksmith services in Sunnyvale, CA | Foster Brothers Security Systems
Safe services in Sunnyvale, CA | Foster Brothers Security Systems
Door lock services in Sunnyvale, CA | Foster Brothers Security Systems

For more information about our lock and door hardware installation, maintenance, and sales services please contact us toll-free at 1-800-929-3938 or by filling out a contact form.


Office Hours

Mon: 8:00 am – 5:00 pm
Tues: 8:00 am – 5:00 pm
Weds: 8:00 am – 5:00 pm
Thurs: 8:00 am – 5:00 pm
Fri: 8:00 am – 5:00 pm

*24 Hour Emergency Services Available