The Architect, Designer, Builder or Owner engage the Licensed Building Certifier/Building Surveyor as the Building Assessment Manager, to regulate or manage a project, on behalf of the local authority (usually Council), generally after a preliminary approval is required, or to determine that a project meets all the relevant minimum Planning Code requirements, under the Building Certifier's guidance, or as part of a discretionary process. The Building Certifier interacts with all professionals & often the Senior trade contractors engaged within the building & inspects the works as they proceed, during mandatory inspection phases of footings, slab, frame, fire separation & final, to ensure compliance with the approved plans, the NCC & relevant Australian Standards. Building Surveyors or Building Certifiers are licensed by the state they practice in & have 3 different levels. Building Surveyors were first conceived after the Great Fire of London in 1666 in the UK, where their primary focus is the safe construction & use of the building concerning the life-health & safety of the occupants. Plumbing Works  Plumbing works are generally approved & inspected at various stages, by the Local Authority (Council) Plumbing Inspectors who have a Hydraulic/Plumbing trade qualification & experience, to ensure public potable water safety, contain the spread waste-water products & regulate responsible ground water discharge. Larger infrastructure i.e. dams, pipe line networks, roadway drainage, flood mitigation works, etc, calls for a Civil Engineering background. National Construction Code (NCC)  All state building acts & regulations refer to the minimum standards required within the Building Code of Australia (BCA), now the National Construction Code (NCC) since 2011, of which there are 3 volumes, which deals with individual aspects of buildings in categorised sections, based on the use (class), size of the building & type of construction, A, B or C, where Type C is the least fire resistant. Volume 1 - Buildings classes 2 to 9 - larger commercial buildings - ie 2 residential units, 3 motels, 4 caretakers residence in a larger building, 5 office, 6 shop, 7 warehouse, 8 factory, 9 public buildings eg schools, hospitals, etc.   Volume 2 - Buildings classes 1 & 10 - smaller residential buildings ie 1A house, 1B small residential boarding house, 10A carport, 10B swimming pool. Volume 3 - Plumbing & Drainage - including fire fighting, gas, solar water heating, air con & on site waste water systems - for all buildings & external civil works.