Public engineering firm directory

Find engineering consulting firms by capability and location.

Search engineering firm profiles built for buyers who need a shortlist, not a sales pitch.

Filters1

The Thrasher Group, Inc.

Beckley, WV

Creating Stronger Communities

Website7 offices11 leadersFounded 1983Updated Jun 2026

Service detail: Architecture

Service: ArchitectureService: EngineeringService: Civil and Site EngineeringIndustry: CommercialIndustry: EducationType: Architecture & Engineering+27 more

Thermo Systems LLC

East Windsor, NJ

A Premier Systems Integration Partner

WebsitePhone31 offices8 projects2 credentialsFounded 1998Updated Jun 2026

Project: Catalent Steam Humidifier Addition

Service: Automation and Control SystemsService: Controls for Energy and Industrial UtilitiesService: Building Automation Systems (BAS)Industry: Data CentersIndustry: Mission Critical FacilitiesType: Automation & Controls+31 more

Toole Design

Silver Spring, MD

Groundbreaking Work That Moves People

Website18 offices4 projects4 leadersFounded 2003Size Estimate: 300-500 employeesUpdated Jun 2026

Project: AASHTO Guide for the Development of Bicycle Facilities

Service: EngineeringService: Conceptual DesignService: Construction AdministrationIndustry: GovernmentIndustry: FederalType: Civil Engineering+40 more

Trans Associates Engineering Consultants Inc

Pittsburgh, PA

Small Firm Client Focus, Large Firm Capability

WebsitePhone3 offices5 projects1 leadersUpdated Jun 2026

Project: Pennsylvania Turnpike Truck Parking Study

Service: Transportation PlanningService: Funding ApplicationsService: NEPA Coordination and Document PreparationIndustry: TransportationIndustry: UtilitiesType: Transportation Engineering+36 more

Tri-Tech Associates, Inc.

Centerville, OH

Tri-Tech Associates, Inc., operating as Tri-Tech Engineering, is a multidiscipline engineering firm founded in 1977 and based in Centerville, Ohio. Originally rooted in the Dayton area's automotive and heavy industrial markets, its practice now extends to commercial, healthcare, retail, and structural projects. Its staff delivers plumbing, mechanical, electrical, and structural design together with LEED program management, energy studies, commissioning, and investigative and forensic engineering services.

WebsitePhone1 officeFounded 1977Updated Jun 2026

Service detail: MEP Engineering

Service: MEP EngineeringService: Plumbing DesignService: Mechanical DesignIndustry: IndustrialIndustry: ManufacturingType: MEP+10 more

Triad Engineering, Inc.

Scott Depot, WV

Triad Listens, Designs & Delivers.

Website10 officesFounded 1975Size Estimate: 100-249 employeesUpdated Jun 2026

Service detail: Civil Engineering

Service: Civil EngineeringService: Site Grading and Development PlansService: Stormwater ManagementIndustry: CommercialIndustry: ResidentialType: Civil Engineering+109 more

Triumph Services LLC

Cleveland, OH

Engineering + Material Testing

WebsitePhone3 offices2 leaders1 credentialsUpdated Jun 2026

Service detail: Structural Engineering

Service: Structural EngineeringService: Mechanical EngineeringService: HVAC DesignIndustry: EducationIndustry: IndustrialType: MEP+21 more

V3 Companies

Chicago, IL

The Vision to Transform with Excellence

Website14 offices7 projects15 leaders2 credentialsFounded 1983Updated Jun 2026

Project: Elgin O'Hare Western Access Project

Service: Land DevelopmentService: Site Civil EngineeringService: Environmental ConsultingIndustry: CommercialIndustry: EducationType: Civil Engineering+49 more

VT Design Solutions

Cincinnati, OH

Smart and Sustainable Engineering Solutions

WebsitePhone1 office2 credentialsFounded 1999Updated Jun 2026

Service detail: MEP Engineering and Design

Service: MEP Engineering and DesignService: HVAC System DesignService: Electrical System DesignIndustry: IndustrialIndustry: ManufacturingType: MEP+16 more

Wertz Geotechnical Engineering, Inc.

Doylestown, OH

Uncover the Story of Your Land.

WebsitePhone1 officeUpdated Jun 2026

Service detail: Geotechnical Engineering

Service: Geotechnical EngineeringService: Site condition analysisService: Geotechnical recommendationsIndustry: InfrastructureIndustry: CommercialType: Geotechnical Engineering+10 more

Wessler Engineering

Indianapolis, IN

There is no water problem we can't solve togetherâ„¢

WebsitePhone8 offices8 projects8 leaders6 credentials3 publications

Project: Warsaw Wastewater Treatment Plant

Service: Wastewater EngineeringService: Wastewater treatment plant designService: Wastewater collection system design and rehabilitationIndustry: GovernmentType: Automation & Controls+54 more

Wilcox Environmental Engineering, Inc.

Speedway, IN

Wilcox Environmental Engineering, Inc. is an environmental consulting and engineering firm founded in 1994 and headquartered in Speedway, Indiana. The practice provides investigation and remediation, Phase I and Phase II environmental site assessments, industrial services, data management, and litigation support to industrial and commercial clients throughout the Midwest. Professional geologists and engineers with expertise in petroleum hydrocarbons, chlorinated solvents, metals, and industrial hygiene serve clients under Indiana, EPA, and HUD environmental programs.

WebsitePhone3 offices8 leadersFounded 1994Updated Jun 2026

Service detail: Investigation and Remediation

Service: Investigation and RemediationService: Site Characterization and Contaminant DelineationService: Vapor Intrusion Assessments and MitigationIndustry: Environmental & RemediationIndustry: CommercialType: Environmental Engineering+20 more

Wiss, Janney, Elstner Associates, Inc.

Northbrook, IL

Solutions for the Built World

WebsitePhone30 offices5 projects5 credentials5 publicationsFounded 1956

Project: Washington Monument

Service: Structural EngineeringService: Bridge EngineeringService: Heavy Movable StructuresIndustry: GovernmentIndustry: TransportationType: Architecture & Engineering+54 more

Woolpert

Beavercreek, OH

Global resources. End-to-end solutions. Innovative results.

WebsitePhone8 offices3 projects8 leaders9 credentialsFounded 1911

Project: USACE I-ATLAS Coastal Mapping and Nautical Charting

Service: ArchitectureService: Mission-Critical ArchitectureService: Education Facility ArchitectureIndustry: AviationIndustry: AirportsType: Architecture & Engineering+48 more

Y aXis Services, Inc.

Cleveland, OH

Where Inputs Become Impact

WebsitePhone1 office1 leadersUpdated Jun 2026

Service detail: Mechanical Engineering

Service: Mechanical EngineeringService: Systems Modeling and DesignService: Equipment Design and PrototypingIndustry: DefenseIndustry: FederalType: Mechanical Engineering+25 more

ZMM Architects and Engineers

Charleston, WV

It's more than architecture, it's about building your legacy.

Website4 offices2 leaders10 credentialsFounded 1959Size Estimate: 70+ employeesUpdated Jun 2026

Service detail: Architecture

Service: ArchitectureService: Building DesignService: Sustainable / Energy-Efficient DesignIndustry: EducationIndustry: GovernmentType: Architecture & Engineering+22 more

deciBel Research

Huntsville, AL

Making Systems and Their Sensors Smarter

Website5 offices1 projectsFounded 2002Updated Jun 2026

Project: Missile Defense Agency Modeling and Simulation Contract for Truth Models and Element Representations (MASC-T)

Service: Modeling, Simulation, and AnalysisService: Digital and Hardware-in-the-Loop TestingService: Simulation Tool DevelopmentIndustry: DefenseIndustry: Intelligence & National SecurityType: Defense Engineering+16 more