While Leonardo created masterpieces out of paint and canvas, Leopardo creates them from brick and mortar. One of the top contractors in Illinois, Leopardo Companies, which also has an office in South Carolina, provides an array of construction services from pre-construction and general contracting to construction management, design-build, green building, and real estate development. Projects include office buildings; health care facilities; senior housing; retail, office, and industrial space; airports; condos; and community projects, such as churches, libraries, and schools. It is also a top interiors contractor. CEO Jim Leopardo started the company in 1979.

Martin Marietta Materials supplies the products to build the world around you. We are the nation’s second largest producer of construction aggregates used primarily for construction of highways and other infrastructure projects, in certain green initiatives, including flue gas desulphurization, and in the domestic commercial and residential construction industries. Our Aggregates Business’ network of more than 285 quarries, distribution yards and plants spans coast to coast through 27 states, Canada, the Bahamas and the Caribbean Islands.

Belcan can take care of the technical stuff. The company's engineering division provides such services as product design, testing, procurement, and computer modeling. Its IT and media division produces videos and interactive presentations and provides desktop publishing and e-learning services. Belcan's automation and design/build team engineers and installs complete factory automation systems. The firm also offers technical and general staffing services. With nearly 60 offices in the US and around the world Belcan reaches clients in the aerospace, energy, health care, and manufacturing industries. The company was founded in 1958 by Ralph Anderson.

Clarion Bathware is a good place to start if you want to cry, "take me away, Calgon." The company manufactures gel-coated fiberglass and acrylic products such as assisted-living shower and tub models, whirlpools, shower stalls, and soaker tubs. The company markets and sells its products through an extensive network of sales representatives to supply houses, plumbing contractors, builders, and remodeling customers. Clarion Bathware was founded in 1973.

Catchy, no. Descriptive, yes. CH2M HILL's name is culled from its founders (Cornell, Howland, Hayes, and Merryfield) plus HILL, from its first merger. The engineering and construction group is organized into three divisions: government, environment, and nuclear; facilities and infrastructure; and energy. Federal projects typically include nuclear and environmental cleanup and government facility operations. The firm also works for state and local governments building water and wastewater systems, airports, highways, and other transportation projects. Its energy division targets private sector companies in the chemical, energy, and life science industries. Founded in 1946, the company is owned by its employees.

Strathclyde Homes is a builder of both residential and commercial properties. In addition, the company operates a home and apartment rental business, Strathclyde Homes Residential Letting. Since the company sold its first homes in 1988, it has ventured into a small portfolio of commercial developments with further plans to develop across the country.

Hanson was quite a catch for HeidelbergCement, which bought the building materials giant in 2007 to become one of the world's top cement companies. Hanson Limited makes and delivers aggregates (crushed rock, sand, and gravel), ready-mixed and precast concrete, asphalt, bricks, flooring, and other building materials. Its products are used for civil as well as commercial, residential, and industrial jobs. Hanson also provides civil engineering services through Hanson Contracting (road surfacing) and Irvine-Whitlock (specialist brick and block laying). In the UK, Hanson Limited operates more than 350 manufacturing sites (more than half are cement plants) and maintains a delivery fleet of more than 1,000 vehicles.

Wirt Design Group provides interior architectural design services from pre-project planning to implementation, including proprietary 3-D modeling of projects and incorporating green design practices. The firm caters chiefly to the entertainment, financial and business services, hospitality, and technology sectors in California. It has worked on multiple projects for firms such as The Capital Group Companies and Northwestern Mutual. Other notable clients have included Yahoo!, Disney, and EarthLink. Principal Jeff Wirt founded the company in 1994.

J.L. Patterson & Associates has been working on the railroads. Serving public and private sector clients, transportation engineering firm J.L. Patterson & Associates specializes in rail transportation projects. The company provides engineering design, construction management, and staff augmentation services, primarily for transit authorities, commuter rail systems, and freight railroad clients throughout the US. Hispanic-owned and woman-owned J.L. Patterson & Associates was founded by president Jaqueline L. Patterson in Orange, California.

Hubert Construction LLC company offers preconstruction, design/build, construction management, and general contracting services to fellow businesses. Services include budget estimating, early procurement, interior design and decor, and small scale repair and maintenance. Hubert's creates office buildings, hotels, industrial, recreation facilities, and commercial interiors in Maryland and Virginia. The late Ralph Hubert started the company in 1998 after 50 years in the construction business.

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