- 620 Corporation
 - Constructs pre-engineered buildings and masonry for commercial and industrial use. - A-Wall Building Systems
- In-plant modular rooms and speciality enclosures for people, product or process.
- BIG Enterprises
- Prefabricated and custom guard, toll, and parking booths, bullet resistant kiosks, bus shelters, portable buildings and structures.
- Enwood Structures, Inc.
- Manufactures wood bridges, shelters and lighting standards.
- Fabrik International
- Specialising in pre-engineered structures.
- Finished Basements
- Consumer information site for finished basement systems. Includes product descriptions and quotes from local contractors.
- FS Industries
- Manufactures a range of pre-engineered steel products including mezzanines, stairways, monorails, and cranes.
- Fullerton Building Systems
- Provides pre-engineered systems for municipal and commercial buildings, multi-family homes, and convenience stores.
- Handi-Hut, Inc.
- Manufacturer of smoking and bus stop shelters for schools, hospitals, government agenices, and more.
- Henges Manufacturing Inc.
- Manufacturer of modular in-plant buildings, mezzanines, pre-assembled buildings, guardrail and partitions.
- IQS: Mezzanines Manufacturers
- Directory of manufacturers of custom, pre-engineered, portable, free-standing, warehouse, multi-story, and modular mezzanines.
- Northeast Structural Systems, Inc.
- Exclusively manufactures pre-engineered steel buildings.
- Panel-Built
- Offers modular buildings, steel mezzanine systems, and in-plant offices.
- Poligon Park Architecture
- Line of pre-engineered shelters, gazebos and pavilions in bolted, tubular steel.
- PortaFab Corporation
- Modular building system manufacturer offers prefabricated panel construction and wall systems for in-plant offices, industrial paint enclosures, cleanrooms, environmental rooms, and mezzanines.
- Progressive Sales Co.
- Specialises in pre-engineered structures. Provides samples and installation, as well as information, pictures and quotes for mezzanines, modular offices and more.
- Ramtech Building Systems
- Direct manufacturer of custom modular buildings for education, commercial, medical, and government use.
- RC Wegman Construction Company
- Contractor and pre-engineered building dealer, providing construction management and design build services for new-renovated commercial, public, and industrial sites.
- Top Housing
- Designs and supplies pre-engineered building systems.
- United Partition Systems, Inc.
- Manufacturer of interior and exterior prefabricated structures.
- Vanguard Modular Building Systems
- Offers modular space for educational, commercial, and healthcare uses.
- WS Construction
- Specialises in design, sales, and erection of metal buildings.
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