The 10 best-rated security guard services in Santa Clara, CA average 4.9★ on Google across 1,599 reviews. Alert Security & Patrol has the top rating (5.0★), and McGrew and Associates, Inc. has the most reviews (517). Updated October 26, 2026.
10 companies that meet our bar: rated 4.5★ or higher on Google, with a meaningful review history (1,599 reviews combined) and currently operating. Request a call back and the company will phone you directly.
“I was really pleased to have Nick as an instructor. He provided very detailed information and experiences to smoothly move the flow of the training. He engaged with an open mind and approachable demeanor. Nick is…” — Google review
“This company is very reliable and responsible. We uses their service to patrol two sites of our organization. Thumbs up.” — Google review
“Had our ADT system installed today. Our technician Chuck and his partner was knowledgeable and patient. Chuck made sure everything was working before leaving.” — Google review
“We are a commercial lock, door, and safe company. We have National accounts and Foster Brothers Security Systems is our go-to company for our South SF Bay Area markets. Fast service. Always had the time and part.…” — Google review
“Used their on-going security service for our multiple corporate sites and we have been enjoying top notch service. Their forthcoming and honest service helps us understand how to protect our business and we…” — Google review
“We had a persistent ground fault issue in our fire alarm system that several companies couldn’t figure out for a long time. This team came in, diagnosed the problem quickly, and got it repaired efficiently. They also…” — Google review
“I used Global Risk Solutions for security in San Francisco and was truly impressed by the professionalism of the agents. Their executive protection services were flawless. Joseph has been an exceptional agent and I…” — Google review
“Jordan at Elwin Security has been extremely helpful. We worked with him on the installation of a ButterflyMX intercom at one of the buildings we manage in Oakland, and he was very professional throughout the entire…” — Google review
“Great security team and highest security service standard I will definitely hire them anytime I needed security service definitely.” — Google review
We scan Google Maps for security guard company listings in and around Santa Clara, keep only open businesses whose main category matches the service, and require a Google rating of at least 4.5 from at least 20 reviews. Companies are ordered by a confidence-weighted score that balances rating and review volume. We do not accept payment for placement.
Alert Security & Patrol has the highest Google rating on our Santa Clara list: 5.0 out of 5 from 42 reviews (as of October 26, 2026).
McGrew and Associates, Inc. has the most Google reviews among the companies listed here: 517, with a 4.9★ average.
Only open Santa Clara-area businesses whose Google category matches the service, rated at least 4.5★ from at least 20 Google reviews. They are ordered by a confidence-weighted score of rating and review volume. Placement is never paid.
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