Since 1968, Mark Line Industries has been delivering custom modular buildings to clients across North America and overseas.  From our roots, as a manufacturer of relocatable offices and classrooms, Mark Line grew from a single location, to one of the country’s foremost custom fabricators of modular buildings and permanent modular construction.  We serve clients in need of modular schools, modular classrooms, modular offices, modular medical buildings, modular urban housing, and modular hotels.

Today, we are recognized as one of the industry’s most innovative fabricators, serving both private and public sector clientele across North America as well as delivering mission critical facilities overseas.  We are proud to be a family-owned fabricator, proving that American manufacturing and innovation is alive and well.

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Construction is one of the oldest professions known to man.  Over several thousand years, humanity has built structures for a variety of purposes, and surprisingly, there has been relatively little process innovation over the millenia.  Materials are delivered to a site, labor travels to the site each day and then assembles the material into a finished building.

The Bureau of Labor Statistics shows that since the second World War, the construction sector is the only one in which productivity has actually DECREASED.  Mark Line leverages the latest in technology, equipment, and parametric design to deliver high-quality space with a high-degree of cost certainty on an accelerated timeline for clients across North America.

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Mark Line News

CurbedNY Tours an ML Building

modular urban housing Our urban density interim housing prototype fabricated for NYC OEM and FEMA with partners Garrison-Architects Read more

Inhabitat Covers Mark Line in NYC

Popular architecture, design, and sustainability blog “Inhabitat” recently took a tour through Mark Line’s urban Read more


NYC’s Modular Construction Phase

If you can make it in New York City, you can make it anywhere!  The Read more

Material Innovation

High Performance Fiber Cement

taktl Low-end fiber cement products can be found cladding relocatable modular buildings across the country.  For Read more

Vaproshield Features Mark Line

We think Vaproshield has one of the best products out there for weather resistive barriers Read more


Structocrete Sheds Weight

Many readers of our blog may have noticed that Mark Line has moved upmarket recently Read more

Tech Innovation

Google Glass and Fabrication

Brian Ho Google Glass and augmented reality are interesting concepts that we are waiting for with great Read more

Best Construction Apps

I was visiting a jobsite the other day and noticed the sudden prevalence of tablets Read more


3D and 4D Printing

The Mark Line family of companies recently welcomed a new member – a 3D printer. Read more


Mark Line fabricates modular structures off-site in a climate controlled indoor fabrication facility.  Our company’s sustainability goals are to reduce the amount of materials diverted to landfills and re-use materials wherever feasible.  The controlled shopfloor environment allows us to do this in a manner that conventional construction never could.

Off-fall steel and lumber is recycled or re-used in appropriate places (backers, etc) and the indoor secure fabrication building keeps stored materials out of the elements and eliminates theft and vandalism.  Mark Line generates much less than 2% waste compared to site construction which can exceed 5%.


Modular fabrication can dramatically compress and accelerate construction timelines, delivering reductions of 25-50% depending on the details of the project.  From an overall process standpoint, modular fabrication allows for concurrent construction:  the building is being fabricated offsite as modular units at the same time that site development and foundation construction is happening at the site.

By working indoors, using an assembly line process similar to that of the automated, lean manufacturing employed by the automotive industry, buildings are completed faster and more efficiently, while the indoor nature of the process eliminates weather delays that plague conventional projects.


Modular buildings are a smart solution in today’s economy.  By working offsite in a manufacturing environment, there is a much greater degree of cost certainty.  The overruns that can be commonplace in conventional construction can be removed from one phase of the project by utilizing offsite fabricated modular units.

The modularity of structures also allows for flexibility for the owner as their needs change over time. Too often a new building is a captive solution and owners must project their needs far out into the future.  Modular buildings can be designed to scale overtime, adding to the overall footprint or height of the building all while minimizing disruption to the current occupants.