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Welcome to Trinity Gate and Door Co.

Quality Gate Repair and Installation in the Pacific NW

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About Trinity Gate and Door Co.

Welcome to Trinity Gate and Door Co., the Pacific Northwest’s  premier automated security gate, access control and perimeter security installer. We are dedicated to providing quality installation and repair services to industrial, energy infrastructure, commercial and the residential client. Whether you’re a business owner looking to protect your property or a homeowner looking for peace of mind, you can trust us to provide quality installation and repair services.

About Us

Reliable Gate Experts

Given our extensive experience we understand the rapidly evolving security requirements of high-risk industries and infrastructure. Our highly specialized team has diverse and extensive skill sets from manufacturing and solution engineering to product integration, project and program management.

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Gate Repair and Installation Services

Service and Repair

Our team can quickly diagnose and resolve issues with your industrial, commercial, or residential automated gate systems and access control, ensuring minimal downtime for your property's safety and security.

New Gate and Operator Installs

We are a full service Electrical general contractor specializing in all aspects of perimeter security. We use our experience and knowledge procuring the best in automated security gate, access control and perimeter security systems that are tested, certified and guaranteed while being completely modular and customizable for the most rapid and effective installations.

Preventative Maintenance Inspections

We offer preventative maintenance inspections to ensure that your automated security gate and access control systems remain in optimal condition all year. Trinity Gate and Door Co. Field Service Technicians will perform a full range of maintenance services including lubrication, safety testing and more.

Gate Upgrades and Retrofits

If you have an outdated gate but don’t quite need a new one, our technicians can retrofit your existing system. This includes identifying areas of improvement, installing new parts, and implementing safety enhancements. UL325 Safety Compliance.
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Industrial Property Owners

We understand that security is an essential part of operations for industrial property owners. Our security gates and access control systems are designed to secure the premises and restrict access to unauthorized personnel. We specialize in crash rated barrier gates.

Energy and Infrastructure

We specialize in developing and implementing sector-specific solutions to meet unique requirements. We combine market leading products and technologies to defend and protect high risk industries such as oil, gas, energy sites, data centers, and other critical infrastructure mitigating risk and protecting against security threats.

Commercial Property Owners

We offer a variety of security gates for commercial properties, including sliding gates, swing gates and traffic control gates. We work closely with Multi-Unit/Family Management companies, HomeOwners Association, Storage Facilities, and various other management companies to understand your property’s security concerns and install a system that meets those requirements.

Residential Homeowners

Residential gates not only protect the home but give the homeowner peace of mind. We collaborate with your home builder or designer to create custom gates that meet their specific requirements, budgets, and style preferences.

Your Premier Gate Company in Seattle

40+ Years Experience

30+ Trusted Manufacturers

Countless Projects Completed

Servicing All of Washington State

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Why Work With Trinity Gate and Door Co.

Quality. Reliability. Experience.


Combining product innovation and expertise to provide turnkey reliable automated gate, access control and perimeter security solutions.


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


Our 40+ years of experience has made Trinity Gate and Door Co. more effective and efficient enabling us to build trust with our clients and deliver on our promises to them.

Browse Our Selection Of Gate Parts and Accessories

Trinity Gate and Door Co. sells a wide selection of gate products and accessories including gate operators, cameras, keypads, alarms, receivers, and more. Browse our selection today!

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Find us in your city

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

Contact Trinity Gate & Door Co. Today!

+1 425-881-3554
Redmond, WA