persons employed to undertake specialist work beyond the capacity or capabilities of the main contractor. Domestic SCs are employed directly by the main contractor. Named SCs are on lists of firms specified by the client or his architect, and thereafter approached by whoever is tendering for the work. Nominated SCs are specialist firms selected by the client or his architect, with whom the main contractor must then work.
A person or company that contracts with the builder to perform work on a specific part of a construction job, such as excavation, plumbing, electrical work, or landscaping. Also called "sub".