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About Mark Line Industries, since 1968 modular building collage Current Inventory

About Mark Line Industries


Headquartered in Bristol, IN, MARK LINE INDUSTRIES was founded in June 1968, to manufacture high quality mobile offices for the construction industry. Over the years, MARK LINE has evolved by expanding into permanent and relocatable (temporary) modular buildings for commercial, institutional, and government applications.

MARK LINE INDUSTRIES operates from modern office and production facilities in Indiana, Pennsylvania, and North Carolina. Each location is served by an experienced team of modular design engineers and building professionals stationed at the corporate headquarters.

MARK LINE buildings and mobile offices are marketed through a network of independent building or trailer dealers and commercial lease / rental companies. MARK LINE structural components are provided to building contractors and commercial developers.



Each MARK LINE structure is custom built to occupancy and code requirements for the designated building site. A modular plan is first engineered in-house and submitted for state approval prior to production. State or state-certified code inspectors visit our factories during production, as they do all traditional building sites, to verify that construction is according to applicable building methods and code. The end result is a quality structure with a life cycle consistent with on site construction and superior fit and finish.

When a modular building is designed for a permanent foundation, the aesthetic possibilities are nearly endless; real brick, stone, etc. can be applied on site following delivery and setup.

Our buildings range from 25 sq/ft in-plant offices, to single and multi-story floors that exceed 50,000 sq/ft. Construction is offered in your choice of wood or steel frame with optional re-enforced poured concrete floor.


Core building modules are used by site contractors to greatly reduce the time required to frame-up and secure their building projects. Contractors can order structural cores to include their preferred systems, components, and mechanicals factory installed. Normal inclusions are windows, doors, interior walls, insulation, plumbing, HVAC, cabinetry and electrical.

MARK LINE components reduce construction time and the contractors' exposure to site-related peril, such as costly weather delays, material damage, theft, and vandalism. Our components also allow contractors to compete aggressively with a given labor force and fewer sub-contractors.


MARKLINE mobile offices rank among the industry's finest in quality and durability. Customers choose from standard lengths, widths and floor plans, or custom order to their exact specifications. Typical applications are job site construction trailers, field offices, mobile testing and learning centers, mobile laboratories, workshops, restroom facilities, clean and decontamination rooms, event ticketing and concession, utility, etc.


MARK LINE employees are committed to providing customers with the very best in quality, value and service. To that end, we honor our slogan, "Quality & Integrity Since 1968!"

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One of the oldest & most advanced modular building companies!

Corporate Offices: PO Box 277, 51687 CR 133, Bristol, IN 46507 ph: 574.825.5851

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