Guard Booths & Buildings

Modular Inplant Offices

Modular Cleanrooms

Outdoor Equipment Enclosures

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


See Our Work

A Cooling Room Solution for A Construction Materials Company

Recently we were contacted with a request for preassembled “cooling” rooms. The company produces gypsum panels and other quality construction materials. Much of their manufacturing operation takes place in unconditioned space. During warmer months plant temperatures can rise significantly so it becomes critical for employees to have access to temporary relief. This provides not only […]

Custom Designed Scale House for Grossman Iron & Steel

A family owned business for three generations, Grossman Iron & Steel Co. has been in the scrap processing business for 100 years. When they needed a new retail scale house, they knew they could rely on Porta-King for a high quality structure. Choose Porta-King for High Quality Steel Structures The owners of Grossman Iron & […]

guard towers and modular guard buildings with schematics