Residential construction projects include houses, townhouses, apartments, condominiums, cottages, single unit dwellings and subdivisions. The housing designs are generally done by architects and engineers and the construction is executed by builders who hire subcontractors for structural, electrical, mechanical and other specialty work.
Industrial construction is only a small part of the whole construction industry nevertheless it is a very important part of the industry. These projects are generally owned by big, for-profit industrial corporations such as manufacturing, power generation, medicine, petroleum, etc.
Heavy construction projects usually involve projects that are not properly classified as either "building" or "highway." Examples of this type of project would be: water and sewer line projects, dams, sewage treatment plants and facilities, flood control projects, dredging projects, and water treatment plants and facilities.