Business Details
50+ Years
experience
Trusted Civil & Structural Engineering Services in Gulfport, MS
Since 1973, Simpkins & Costelli has provided professional engineering services specializing in civil and structural engineering design, project management, and construction administration. Our expertise spans waterfront facilities, commercial and industrial buildings, municipal infrastructure, and civil site work for clients along the Mississippi Gulf Coast. Founded by Harry Simpkins, III, and later expanded with Michael Costelli as a partner, our firm maintains a commitment to quality through personalized attention and advanced technical resources.We serve public and private clients, including industries, municipalities, and government agencies, while emphasizing responsiveness and flexibility through our small-team structure. Our engineers utilize modern software tools for structural analysis, design, and documentation, ensuring efficient project execution from concept to completion.
Services
Structural Engineering
Civil Engineering
Construction Administration
Water/Wastewater Facilities
Project Management
Feasibility Studies
Expert Testimony
Consulting Services
Marina Facilities
Stormwater Control
Details
- Year established: 1973
Highlights and features
- We offer 50+ years of combined experience in Gulf Coast engineering projects
- Our small-team structure ensures personalized client attention and flexibility
- We specialize in complex waterfront and industrial infrastructure solutions
- Our engineers utilize advanced software for structural analysis and design
- We maintain active involvement in international humanitarian engineering projects
Services
Structural Engineering
We provide comprehensive structural engineering for commercial, industrial, and institutional buildings. Our expertise includes foundation design, superstructure systems, and structural repairs for existing facilities. We specialize in pile-supported concrete wharves and tied-back steel bulkheads for waterfront applications.
Civil Engineering
Our civil engineering services cover drainage systems, utility networks, pavement design, and stormwater management. We handle municipal water/wastewater treatment facilities and site development for residential and commercial subdivisions across the Gulf Coast region.
Construction Administration
We provide continuous construction phase support to ensure design intent is maintained. Our team coordinates field implementation, addresses technical challenges, and verifies compliance with engineering specifications throughout project execution.
Water/Wastewater Facilities
We design and manage municipal and industrial water treatment plants, wastewater systems, and related infrastructure. Our solutions address regulatory compliance, capacity requirements, and long-term operational efficiency for public and private clients.
Feasibility Studies
We conduct technical and economic evaluations to assess project viability. Our studies consider site conditions, regulatory requirements, and construction challenges to inform decision-making before design implementation.
People
Madeline Costelli Pettry
President
President and licensed Professional Engineer with extensive experience in civil engineering projects. Leads firm strategy and technical operations while maintaining active involvement in client projects.
Michael R. Costelli
Vice President
Vice President and licensed Professional Engineer with decades of Gulf Coast engineering experience. Focuses on structural design and construction administration for complex infrastructure projects.
David P. LeBlanc
Construction Engineer
Licensed Professional Engineer specializing in construction phase support. Coordinates field implementation of engineering designs and addresses technical challenges during project execution.
Anthony Imhoff
Project Engineer
Project Engineer responsible for technical execution of engineering designs. Works closely with senior staff to deliver structural and civil engineering solutions for diverse client projects.
Sheila McLaughlin
Administrator
Office Administrator managing day-to-day operations and client communications. Provides essential support for project coordination and business management functions.
Questions
What engineering services do you specialize in?
We specialize in civil and structural engineering for waterfront facilities, commercial/industrial buildings, water/wastewater infrastructure, and civil site work along the Gulf Coast.
How long has your firm been in business?
Simpkins & Costelli, Inc. has provided engineering services since 1973, with our current partnership structure established in 1981.
What makes your firm different from competitors?
Our small-team approach allows personalized service while maintaining technical expertise in complex Gulf Coast engineering challenges.
Do you work on international projects?
Yes, our team participates in humanitarian engineering projects through Engineers Without Borders, including projects in Africa and Panama.
What software tools do you use?
We utilize Revit, AutoCAD, Civil 3D, and specialized structural analysis programs for modern engineering design and documentation.
How do you handle construction phase support?
We emphasize construction administration to ensure practical design implementation, maintaining project quality and efficiency during field execution.
