In 1997, DDG began 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. Since our founding, our unwavering commitment to client service excellence has allowed us to grow into a multidisciplinary regional firm with over 150 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, surveying, and project management. 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.

Value Beyond

Going beyond learning about your typical project details, we encourage a deeper connection and conversation around the benefits you may not have considered.


A strong and cooperative workplace culture is the cornerstone of DDG’s success. We recognize that our multidisciplinary teams represent the most critical component of delivering on our promise - to plan, design, manage, and engineer solutions that enhance where people interact and come together.

Moments To Remember

Our History


  • Founding of Duplantis Engineering
  • Thibodaux Becomes the First Office Location
  • Civil Engineering Service Added


  • Company Name Changed to Duplantis Design Group
  • Architecture Service Added


  • Covington, LA Office Added


  • Houston, TX Office Added


  • Baton Rouge, LA Office Added


  • Landscape Architecture Service Added


  • Coastal and H+H Engineering Service Added


  • New Orleans and Lafayette, LA Office Added
  • Surveying Service Added


  • Environmental + Regulatory Service Added


  • Mobile, AL Office Added


  • Survey Expanded to Houston, TX

Our Projects

Nationwide Experience

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Locations Map