Construction, repair and demolition of buildings, highways, streets and culverts; heavy construction of such projects as sewers and water mains, railway roadbeds, railroads, piers, tunnels, subways, elevated highways, bridges, viaducts, dams, drainage projects, sanitation projects, aqueducts, irrigation and flood-control projects, hydroelectric plants, water power projects, gas mains, pipelines and all other types of heavy construction; marine construction such as dredging, under-water rock removal, pile driving, land draining and reclamation, construction of harbours and waterways; water wells; airports; athletic fields; golf courses; swimming pools; tennis courts; parking areas; communication systems such as telephone and telegraph lines; and all other construction, whether undertaken by private bodies or governmental authorities. Special trade contractors in the field of construction, such as carpenters, plumbers, plasterers and electricians are also included in this group.

This division does not include construction, repair and demolition work undertaken as an ancillary activity by the staff and for the use of an enterprise classified in any other division of the classification. Excavating, overburden removal, shaft sinking and dredging, when undertaken in connexion with mining, are classified in the appropriate group of division 1 (Mining and quarrying).