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 multi-disciplinary regional firm with over 170 full-time employees and 8 offices across South Louisiana, Alabama, Texas, Mississippi – 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, environmental and regulatory consulting, surveying, transportation engineering, funding advisory, structural engineering, 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.

Leadership

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

1997

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

2000

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

2003

  • Covington, LA Office Added

2007

  • Houston, TX Office Added

2009

  • Baton Rouge, LA Office Added

2011

  • Landscape Architecture Service Added

2013

  • Coastal and H+H Engineering Service Added

2018

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

2020

  • Environmental + Regulatory Service Added

2022

  • Mobile, AL Office Added

2023

  • Survey Expanded to Houston, TX

Our Projects

Nationwide Experience

View Projects
Locations Map