Guard Booths & Buildings

Outdoor Equipment Enclosures

Modular Inplant Offices

Modular Walls & Partitions


Guard Towers

Sports Video Towers

Prefabricated Shelters & Vestibules

Committed to creating modern, innovative, cost effective, and quality modular and prefabricated building systems and structures since 1969

Welcome to Porta-King Building Systems.

Since 1969 our modular inplant offices, prefabricated mezzanines, outdoor equipment enclosures, and guard booths have been used for thousands of unique construction applications across North America and throughout the world. We provide our customers with cost effective, highly functional, easy to assemble alternatives to conventional construction.

Porta-King Building Systems offers more prefabricated and modular buildings than any other manufacturer. We offer five different types of prefabricated buildings and shelter systems that include high-level ballistic rated construction. We manufacture eight different types of modular wall systems, structural steel mezzanines and towers. All of these products have attributes that support the efforts of those companies and organizations that want to incorporate a sustainable design philosophy into their business.

We believe the key to our success has been our ability, and willingness, to adapt to new industry trends. Since our inception we have responded to our customers by introducing many "industry firsts" to address these developing trends in the modular and prefabricated construction industry. This includes new products, modification to existing products which includes adaptation to address new building and energy code requirements. Learn how our experience, quality and service can help your organization with versatile and cost effective modular building solutions.

A Few Of Our Satisfied Clients

Porta-King Case Studies

Building an Equipment Enclosure for an Automotive Systems Integrator

Universal Tool Equipment and Controls, Inc. (UTEC) provides automation systems, welding systems, and tooling to several industries including automotive, steel, aerospace, and the energy sector. UTEC came to us with a request for a large laser welding cell. Safety and precision were paramount for this company, whose customer base includes Fortune 500 businesses such as […]

An Observation Tower for the City of Belle Glade, Florida

The city of Belle Glade, Florida, sits on the southeastern shore of Lake Okeechobee, surrounded by the beauty and unique ecosystem of the Everglades. The celebrated Lake Okeechobee Scenic Trail runs through the town. This area is filled with wildlife, like bald eagles, osprey, roseate spoonbills, blue herons and more, and it’s a natural attraction […]

Security Booth Helps Personnel Monitor Boston’s South Station

As a major transportation hub, Boston’s train stations flood with people several times a day. Boston’s South Station, in particular, is busy 24-7. For this reason, security in this terminal is a top concern for public officials. To stay Boston Strong, these officials are taking steps to improve safety procedures for their public transportation system. […]

guard towers and modular guard buildings with schematics