In the context of Australian commercial construction projects, "heartwood" refers to the dense, inner part of a tree trunk, which is typically older and more durable than the outer layers known as sapwood. Heartwood is formed as the tree ages and the inner cells die, becoming infused with natural chemicals that can make it more resistant to decay, pests, and environmental conditions.

In construction, heartwood is valued for its strength, stability, and resistance to rot and insects, making it a preferred choice for structural applications, outdoor use, and areas where durability is essential. In Australia, certain native hardwoods, such as jarrah, spotted gum, and ironbark, are prized for their heartwood properties and are commonly used in commercial construction for flooring, decking, cladding, and other structural elements.

The use of heartwood in construction projects is often guided by standards and regulations that ensure the material's suitability for specific applications, taking into account factors like load-bearing capacity, environmental exposure, and aesthetic considerations.