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States Licensed

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Projects Completed


Licensed Professionals

Our History

In 1997, David Duplantis started DDG as a small, civil engineering firm based in Thibodaux, Louisiana.  From the very beginning, we believed that exceeding our clients’ expectations was the only way to achieve long-term success.  In the 25 years since our founding, our unwavering commitment to client service excellence has allowed us to grow into a multidisciplinary regional firm with over 110 full-time employees and 7 offices across South Louisiana, Alabama, and Texas – Thibodaux (headquarters), Covington, Baton Rouge, New Orleans, Lafayette, Mobile, and Houston.

Originally offering services in civil engineering, we have methodically expanded our services to also include architecture, coastal and water resources engineering, landscape architecture, wetlands and environmental consulting, and surveying.  Through the hiring of key staff and strategic partnerships with specialty firms, DDG has proven the capability to deliver a wide range of services and support.

DDG Philosophy

DDG’s philosophy is simple — maximize employee potential, and it will lead to maximized customer satisfaction. In order to achieve this goal, we have provided a challenging work environment that fosters a sense of accountability into each and every employee. This in turn fuels the passion that has driven us to become the leader in our industry and enables us to maintain long-term relationships with our clients.

DDG Core Values

RICE – Respect, Integrity, Client Satisfaction, Excellence


We have worked with DDG on various projects throughout Louisiana, Mississippi, and Alabama over the last 15+ years. During the entire design process, the DDG team provides invaluable management and development coordination.  They address demands, act efficiently, and provide well-crafted designs in an expedited manner.  

– G. Townsend Underhill, President of Development – Stirling Properties