GB - General Building

CE - Civil Engineering

ME - Mechanical Engineering

SB - Asphalt Works (supply and lay)

SC - Building Excavations, shaft sinking, lateral earth support

SD - Corrosion protection (cathodic, anodic and electrolytic)

SE - Demolition and blasting

SF - Fire prevention and protection systems

SG - Glazing, curtain walls and shop fronts

SH - Landscaping, irrigation and horticulture works

SI - Lifts, escalators and travellators (installation, commissioning and maintenance)

SJ - Piling and specialised foundations for building and structures

SK - Road markings and signage

SL - Structural steelwork fabrication and erection

SM - Timber buildings and structures

SN - Waterproofing of basements, roofs and walls using specialist systems

SO - Water supply and drainage for buildings (wet services, plumbing)

SQ - Steel security fencing or precast concrete