Estimators General Construction : core drilling concrete slabs, site grading and structural excavation, site drainage pipe and structures, site improvements, sheet and foundation piling, formwork, reinforcing steel and mesh, miscellaneous embedded items, concrete, masonry, structural steel and miscellaneous iron, carpentry and millwork, metal doors, sash, class and glazing, special flooring, special walls and ceilings, roofing and siding, ornamental metal and special partition, painting.