Civil & Earthwork

Engineering firm specializing in construction projects, fall protection, construction management, product testing and certification, and unique non-standard problems or projects. They also provide mobile crane services.

O'Dwyer Electric Service is a family-owned and operated business providing residential, commercial, and industrial electrical services in the Grand Valley for over 50 years.

O'Brien Construction is a construction company that provides construction management, general contracting, and preconstruction services. They enhance communities through team building and construction expertise.

OBS Engineering provides wet utilities, dry utilities, excavation, structural concrete, site concrete, demolition, landscape & irrigation services. They focus on providing cost-effective solutions for challenging site conditions and prioritize meeting project schedules and budget constraints.

Ocean Construction Services, Inc. is a mid-sized general contractor serving the Mid-Atlantic region. They offer construction services for both private and federal sectors.

Oceanic Companies, Inc. manages and constructs complex technical projects for various government and commercial clients. They specialize in heavy mechanical and civil projects, aiming to complete projects safely, on time, and within budget.

Ocean Marker Sport Surfaces (2014) Ltd. / Ocean Marker Sport Surfaces USA Inc. provides supply and installation of polyurethane running track surfacing systems, cushioned and acrylic tennis court coatings, and Playground Safety Surfacing.

Ocean Sales, LLC is a strategically oriented HR business services firm providing Executive Recruitment, Workforce Planning, Recruitment Process and Onboarding Process Development with 20 years' experience in Talent Acquisition and Human Resources operations. They specialize in staffing for construction management, operations and trades, particularly in infrastructure, energy, oil, gas, and chemicals. Their goal is creating an effective staffing and recruiting experience, ensuring alignment with clients' operations, business culture, and service delivery.

OCE Contracting is a full-service general contracting company dedicated to building the infrastructure throughout the Greater Hudson Valley Region. They are a certified WBE and DBE with NY State and have extensive experience with Public Works projects for agencies such as the MTA, NYSDOT, and NYS Parks Dept.

Oconee Construction Services, LLC is a full-service commercial construction services contractor providing quality clients with unsurpassed knowledge and value on every job. They focus on attention to detail, commitment to quality craftsmanship, and maintaining the highest level of customer satisfaction. They construct commercial and educational projects across the North Georgia area.

O'Connor Plumbing is a family-owned commercial plumbing company serving the Greater Washington area since 1949.

OCS Industries, Inc. is a service-disabled veteran owned and privately managed diversified construction company. They offer heavy construction, bridge construction, steel and rebar fabrication/installation, wastewater, concrete, millwrighting, and rigging.

Octaform designs and markets innovative, finished formwork for new and existing concrete projects across North America and the rest of the world. They provide concrete wall and finished wall surface, constructed in one step, one system. No sealing or finishing required.

Oden • Hardy Construction is a general contracting company specializing in design/build services. They are licensed for construction and architecture throughout the southeastern United States.

Odin Electric is a Colorado-based commercial electrical contractor committed to providing quality projects on time and on budget. They handle small to large project needs and offer 24-hour service.

ODK Engineering is a firm owned and operated by First Nations professionals. ODK provides professional project management, civil engineering services, construction management and consulting services to First Nations communities, organizations, government agencies, and the Aboriginal business sector.

ODM Electrical Contractors specializes in providing electrical services in hazardous areas, industrial, and commercial sectors. They offer commercial, industrial, data & communications, and maintenance services.

Odyssey Group LLC provides equipment rental services including dumpsters, barricades, portable restrooms, temporary fencing, and temporary storage in the Greater Chicago Area.

Oelrich Construction provides quality construction management services to clients in the North Central and Central Florida regions. They serve education, government, commercial, healthcare, and civil/public infrastructure markets.

WOSB Equipment Rentals, Sales, Safety and Service specializing in Aerial Work, Cranes, Dirt Equipment, Platform Lifts & Material Handling Forklifts

OESCO is a commercial electrical contracting firm providing high-quality electrical services. They focus on teamwork and providing quality electrical installation, sharing their experience with the project team.

Off Hours Construction is a commercial construction company specializing in offices, restaurants, retail stores, R&D/high tech work, security build outs, and small buildings. They also handle ADA compliance, life safety system upgrades, exterior renovations, and warehouses.

O'Gary Construction Group provides pre-construction, construction management, and general contracting services for industrial and commercial projects.

We are the Apprenticeship and Training Program for IUOE Local 18, The Ohio Operating Engineers. We work for our members, training them in safety and equipment operations.

The OVCEC provides resources, information, and training to members within the Ohio Valley's construction industry. It serves as a catalyst to promote and enhance profitability, efficiency, and integrity within the industry. Project BEST is a non-profit construction advocacy organization that jointly represents the construction unions and contractors in the Upper Ohio Valley Building Trades Council.

Ohio Valley Electrical Services manages commercial and industrial electrical projects in the Tri-State area. They have been in operation for 35 years and have completed hundreds of millions of dollars worth of electrical construction.

Ohio Valley Integration Services, Inc. is a low voltage, systems integration contractor that performs a complete range of services in the electronic field, specializing in design, installation, and service of a multitude of systems.

OHLA Building, Inc. is the vertical construction division of OHLA USA. It performs general contracting, at-risk construction management, and design-build services for numerous public and private-sector clients.

OHT Services LLC is a consulting company dedicated to serving other businesses that are highly regulated by OSHA, DOT or their clients. They provide a digitally based data infrastructure to allow real time data input and file consolidations for companies with DOT reporting requirements. They also offer a low-cost management tool, Versabit, to ensure compliance with DOT and OSHA related safety challenges and systems.

Oil Capital Electric is a full-service electrical contractor founded in 1970, offering services throughout Oklahoma and surrounding states. They focus on superior craftsmanship, technical expertise, and safe work environments.

Oil Equipment Company, Inc. specializes in the sale, installation, repair and maintenance of petroleum, lubrication and carwash equipment. They also offer construction services for convenience stores and petroleum-related projects.

Okanagan Demolition is a demolition company.

ODM is a commercial and industrial company that provides HVAC, plumbing, electrical, welding, and design/build services. It is our everyday mission to create an environment that provides an exceptional experience, built on trust, for each customer, every day. With ODM, you can consider it done.

Heavy highway construction business specializing in underground utilities including water mains, sewers, storm drainage, excavation, and demolition.

Old Town Construction is a construction management company in central Indiana specializing in commercial and residential mixed-use real estate developments. They focus on safe, reliable, efficient, and responsible construction practices.

O’Leary Asphalt Inc. is a full service paving, asphalt, concrete, and snow and ice management company serving Maryland, Washington, D.C., and Northern Virginia. They specialize in contracts with commercial building owners and professional property managers, as well as shopping centers, parking lots, places of worship, schools, townhouse & condominium associations, and HOAs.

Oliver Construction Incorporated (OCI) is a full-service general contracting and commercial construction company known for its comprehensive and integrated construction, architectural, and design services.

Oliver Electric Construction, Inc. is a full-service electrical design and construction firm dedicated to the success of our clients. They are a family-oriented company known for their high standard of performance.

Full-service construction management company specializing in delivering high-quality construction services to clients in the commercial and industrial sectors.

OLSEN is passionate about building and committed to delivering exceptional quality and performance. With over $900+ million in completed projects, they transform visions into reality with innovation, precision, and a forward-thinking approach. Their expertise spans Construction Management, General Contracting, and Design-Build, serving industries from critical infrastructure to commercial, healthcare, and higher education.

Olson-Olson Construction, INC builds environments through practical design development and a thoughtful approach to budget savvy construction.

Olsson Industrial Electric is an electrical contractor for heavy industry, offering electrical construction and engineering solutions to public and private sectors. They specialize in diverse industries ranging from pulp and paper to hydroelectric.

O.L. Thompson Construction Co., Inc. is a sitework construction company based in Charleston, SC. They perform turnkey operations in site development, including private, public, government, and commercial development projects.

Full-service electrical contracting firm providing design build and construction services to commercial developers, general contractors, and property owners. Also provide electrical service and maintenance to commercial property owners and management companies.

Olympic Construction Limited has been operating as a General Contractor throughout the Province of Newfoundland and Labrador for the past 40 years. They operate in the commercial, industrial, and institutional sectors.

High-security perimeters are our specialty! We are proud to install and repair intrusion protection barriers, fences, guardrails, and gates for commercial/industrial customers.

A full-service general contracting company with over 40 years of experience delivering high-quality construction, renovation, and remodeling services. They provide customized solutions for large development, commercial, and industrial projects.

Olympus Construction Management is a construction consulting firm that helps guide owners through commercial construction projects. They offer project management services and owner's representation.

OMA Construction is a heavy civil construction contractor known for excellence throughout the Northwest. They focus on quality, ethics, and safety, employing experienced individuals.

Omega & Associates Engineering Ltd. is a Professional Consulting Engineering firm providing structural and civil engineering services in western Canada. They focus on land development, municipal infrastructure, and structural design for various building types.