Boston's Leading
Marine Construction Company

about us

Over 100 long years of marine construction excellence with quality at its best

Coastal Marine Construction LLC (CMCLLC) is a self-preforming marine contractor with proven experience in heavy civil marine construction. CMCLLC is a certified WBE & DBE in Massachusetts, Rhode Island, and pending in New York. Our team includes experienced industry professionals with a combined experience of over 100 years in the marine construction business.

We are Boston’s leading marine construction company for demolition, pile driving, earth support, bridge, pier and deck construction, diving services, and marine salvage. CMCLLC owns numerous barges, cranes, tugboats, and other extensive equipment which enables us to self-preform all our work. Our capabilities include pouring concrete forms, installing rebar, underwater dive operations, timber work, marine salvage, installing cofferdams, piles, & sheets, installation of precast concrete, pile jacket installation & repair, construction & installation of floating docks, underwater blasting, and all facets of revetment & pier construction. We take pride in completing our projects safely, on budget, and on schedule.

To complete all projects safely, on budget and on schedule, with a commitment to our clients, to produce the most reliable and cutting-edge solutions to fit your specific needs.

Safety First

Our company-wide safety protocols are in place at all times and conform to OSHA standards.

On time

We strive to surpass our clients’ expectations by delivering quality projects on time.

Within Budget

Our industry-leading project management teamhave a proven track record of coming in on budget.

This video shows a safety huddle reviewing the Massport 20-20-20 Program: “Every 20 minutes, take 20 seconds and look 20 feet around you.” It is essential to stay aware of changes in your environment to ensure safety throughout the day.

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our capabilities

Some Of The Key Services We Provide

Pile Driving

We have driven, tested, and extracted thousands of piling safely and economically, while meeting environmental concerns

Sheet Piles & Cofferdams

Working around water poses its challenges. Coastal can provide several different options in working below the waterline.

Timber Pier Construction

Piers & Wharf's

Coastal has the technical expertise and equipment to provide a wide variety of commercial grade piers and wharf’s. 


Timber Pier Construction

We construct high-end timber piers for commercial properties using our fleet of best of breed marine construction equipment.

Riprap Construction


Our highly effective revetment designs can help protect your shorelines and cliffs against erosion during heavy rain and flooding. 

Rip Rap Construction

RipRap Construction

Riprap is highly durable and natural looking treatment. It is a highly effective and easily repairable protection system against erosion.

our affiliations

We Are Proud To Be Associated With The Following

womans business enterprise
disadvantaged business enterprise
woman owned business