Marine construction & environmental services
Brennan designs and executes innovative solutions to the world’s most complex maritime, environmental, and infrastructure challenges.
We’ve Been Building For Over 100 Years
We’ve Been Building For Over 100 Years
— EST 1919 —
Brennan is a fourth-generation, family-owned marine construction firm specializing in environmental remediation, dam construction, commercial diving, harbor management, and submarine cable services. Since 1919, Brennan has worked with public and private owners of water-based infrastructure and operates throughout coastal and inland waterways nationwide.
Contact Our Main Office
What We Do
Brennan’s Areas of Focus
Learn From Our Experts
We share insights on our specialized projects, and feature highlights from our dedicated team members.













