In Australian commercial construction projects, a "gutter" refers to a channel or trough installed along the edge of a roof to collect and direct rainwater away from the building. Gutters are an essential component of a building's drainage system, helping to prevent water damage to the structure, foundation, and surrounding areas. They are typically made from materials such as metal (e.g., aluminum, steel, or zinc), PVC, or other durable materials that can withstand the elements. Proper installation and maintenance of gutters are crucial to ensure effective water management and to protect the integrity of the building.

The primary function of a gutter is to prevent water from accumulating on the roof and causing damage to the building's structure, as well as to protect the foundation and landscaping from water damage. Gutters also help to prevent water from entering the building through windows, doors, and other openings, which can lead to mold and mildew growth.

In addition to their functional role, gutters can also serve a decorative purpose, as they can be designed to complement the overall aesthetic of the building. They are available in a range of styles and finishes, including round, half-round, and square profiles, as well as various colors and materials.

For a precise definition of "gutter" in Australian construction standards, it is recommended to refer to the National Construction Code (NCC) 2022 or the Australian Standard AS/NZS 3500.3 .