The term "overhang" refers to an extension or protrusion of a building's structure beyond its main walls or foundation. This architectural feature can serve various purposes, such as providing shelter, enhancing aesthetics, or accommodating specific design requirements.

Overhangs can be found in various forms, including:

1. Eaves: The lower edge of a roof that extends beyond the exterior walls, offering protection from rain and sunlight.
2. Cantilevers: Structural elements that project outwards without direct support from below, creating a visually striking appearance.
3. Balconies: Extensions of a building's floor, supported by beams or columns, providing outdoor space for occupants.
4. Cornices: Decorative moldings or projections along the top of a wall or ceiling, often used to conceal structural elements or add visual interest.
5. Parapets: Low walls or barriers that extend above the roofline, serving as a safety feature or enhancing the building's appearance.

The design and implementation of overhangs in Australian commercial construction projects are subject to building codes, regulations, and engineering principles. These elements must be carefully planned and constructed to ensure structural integrity, safety, and compliance with relevant standards.

Overhangs can contribute to a building's overall energy efficiency by providing shade and reducing heat gain. They can also improve the building's aesthetic appeal and create unique architectural features. However, it is essential to consider factors such as wind loads, snow loads, and potential water ingress when designing and constructing overhangs to ensure their long-term performance and durability.