Designer Definition

An architect, a structural engineer, a mechanical and electrical services engineer, or other designer of any works. Can include a subcontractor.

Quantity surveyors are called "designers" under the Construction (Design and Management) Regulations 1994 (site safety rules, abbreviated to “CDM”), because they compile specifications to which "real" designers have contributed, but otherwise they will typically reject any design responsibility or any description of their services as including design.