Welcome to the PSI Family

Since 1970, Protective Systems Inc. of Seattle has been serving families, businesses and commercial facilities with security and fire systems, alarm monitoring services, and integrated smart home automation. PSI stands for Pride, Service and Integrity - the cornerstones of our success.


At PSI, we’ve had the pleasure of serving some Western Washington families for a span of three generations. Can you think of a better testimonial to customer satisfaction and loyalty?



PSI Residential Services

Residential security systems protect your home and family in an emergency.


PSI Commercial Services

Commercial security systems protect your employees and customers 24/7.

Smart Home Integration

PSI Lifestyle Options

Design your "dream system" with more options and first-quality components.

In addition to a full range of residential and commercial security/fire protection systems, PSI offers a full range of monitoring services to protect your home or business. Protective Systems Inc. is an authorized dealer for First Alert Professional, a Honeywell Company. First Alert is an elite network of independently owned security dealers. That means you get the “hands on” personal care of an independent business, backed up by the innovation and solid proficiency of First Alert and Honeywell, a Fortune 100 Company. PSI is also one of the few companies that can not only install, monitor and maintain the system - we are also licensed to perform commercial fire/sprinkler inspections.


PSI is a First Alert authorized dealer Seattle
PSI is a Honeywell authorized dealer Seattle
Protective Systems Inc BBB Business Review



An alarm company is affordable, life safety is priceless ~ switch to PSI today

Choosing your alarm company is one of the most important decisions you’ll ever make and should never be taken lightly – your safety depends on it. If you made the choice to go with a mega-national security company for your alarm system, how are they working out for you? For the highest level of safety for your home and family, start with a PSI free, no-obligation home consultation. Call 206.322.3186 or click here to learn how easy it is to switch to PSI, even if you're in the middle of a contract with another provider. And, as our gift to you, download a complimentary copy of the e-booklet entitled Home Invasion Safety - Protecting Your Family for invaluable tips on how to keep your home and family safe.