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About Trinity Gate and Door Co.

Securing Washington Since 1979

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Our Story

Our founders recognized a need in the Pacific NorthWest area for automated security gates, access control and perimeter security solutions.  Being pioneers, in the industry they decided to fulfill the need by opening Trinity Gate and Door Co. For over 40 years Trinity Gate & Door Co. has provided premium quality automated gates and access control to industrial, commercial, and residential property owners, helping them achieve custom perimeter security and access control solutions that meet their unique needs.

Today, Trinity Gate and Door Co. is a second generation privately held company that is actively leading the gate industry in the Seattle Area. The family legacy and values remain; we are committed to providing the best possible products and services to customers across Washington!

Our Core Values

Forty years ago, our family-owned and operated company was founded upon the values of quality, excellence, experience, and communication. These values are not just words to us but ideals our team lives out every day.


We are deeply committed to providing clients with the highest quality of work possible. Everything is conducted with the utmost attention to precision and an eye for detail, from our installation and repair services to our customer service.


Trusted by customers for over 40 years to provide reliable services and high quality products from trusted brands.


Here at Trinity Gate and Door Co., we strive for excellence in everything we do. We consistently demonstrate this through high-quality workmanship and prompt customer services that exceed our client’s expectations.


Our team has decades of experience in security gate automation, access control, and perimeter security.  This experience enables them to execute projects of all scopes and complexities providing accurate and informed advice to clients.


We take pride in our ability to communicate quickly and effectively with our clients. Our team is always readily available to answer any questions, concerns, or requests in a timely manner.

We're Proud to Work With The Top Automation Manufacturers & Suppliers

Serving the Greater Seattle Area

  • Seattle
  • Redmond
  • Kirkland
  • Bellevue
  • Sammamish
  • Shoreline
  • Issaquah
  • Renton
  • Mercer Island
  • Bothell

Contact Trinity Gate & Door Co. Today!