- Major duties of construction managers / builders and the related assistant professionals include: manages various processes of construction projects in accordance with the agreed method, procedures, budget and specifications, and the specified time frame in the contract; co-ordinates work of main contractor, sub-contractors, specialist contractors and suppliers; liaises with architects, engineers, surveyors, specialist consultants, contractors and government departments; reviews, inspects, evaluates and reports on the quality, progress and cost of works and adjusts schedule as necessary.