From Longman Business Dictionary
builderbuild·er /ˈbɪldə-ər/ noun [countableC]1PROPERTYJOBa person or company that builds or repairs buildingsHe called in a local firm of builders.
→ cowboy builder → custom builder → speculative builder2ship/car/bridge/railway etc builder a company that makes ships, cars, bridges etcOrders for 10 tankers were placed with NE ship builders.