Construction Category 1
Simple structure, low consequence.
This might include gates, handrails, agricultural buildings (no people congregating) or greenhouses.
Construction Category 2
Medium structure, moderate consequence.
This might include commercial, residential and educational buildings not exceeding 15 storeys, hospitals, warehouses or industrial buildings.
Construction Category 3
More complex, higher risk.
This might include bridges, structures designed for fatigue actions or as specifically required in authority construction specifications.
Construction Category 4
Most complex, highest risk.
The requirements for CC4 are not fully defined in AS/NZS 5131. CC4 applies to unusual or special structures for which it is expected the requirements additional to those for CC3 will be defined at a project-specific level or by a particular organisation, agency or business.