In commercial construction projects in Australia, door jambs are the vertical components that form the sides of a door opening. They are typically made of wood, metal, or other materials and are attached to the surrounding walls or framing.

Double-glazed windows are windows that have two panes of glass separated by a small gap, typically filled with air or an inert gas such as argon or krypton. In commercial construction projects in Australia, double-glazed windows are commonly used to improve energy efficiency, reduce noise pollution, and provide better thermal comfort for occupants.

The two panes of glass in double-glazed windows are typically made of low-emissivity (low-E) glass, which is coated with a thin layer of metal or metal oxide that reflects heat back into the building. This helps to reduce heat loss in winter and heat gain in summer, resulting in lower energy bills and a more comfortable indoor environment.

In commercial construction projects in Australia, a dowel typically refers to a cylindrical rod, usually made of steel, that is used to transfer loads across joints in concrete structures. Dowels are essential for maintaining the structural integrity and alignment of concrete slabs, pavements, and other elements by allowing for controlled movement and load distribution.

In the context of commercial construction projects in Australia, the term "dressed" typically refers to timber or wood that has been planed or smoothed to achieve a uniform surface. This process involves removing the rough outer layer of the timber to create a more refined and aesthetically pleasing finish. Dressed timber is often used for visible structural elements, interior finishes, and decorative purposes because of its smooth appearance and consistent dimensions.

In commercial construction projects in Australia, a drip moulding (also known as a drip edge or drip cap) is an architectural feature designed to direct water away from the structure to prevent water damage. It is typically installed at the edges of roofs, windows, doors, and other exterior elements to ensure that rainwater or condensation does not seep into the building materials, which could lead to deterioration, mold growth, or structural issues.

A dumpy level, also known simply as a builder's level or an automatic level, is a precision instrument used in commercial construction projects in Australia and around the world for establishing or checking points in the same horizontal plane. It is commonly used in surveying and building to measure height differences and to transfer, measure, or set horizontal levels.

In commercial construction projects in Australia, a "dwarf wall" refers to a low wall that is typically used for specific purposes such as supporting structures, dividing spaces, or providing a decorative element. 

The height of a dwarf wall can vary depending on the specific requirements of the project, but it is typically between 600mm and 1200mm high. The walls are usually constructed using masonry materials, such as concrete blocks or bricks, and are designed to provide a stable and durable foundation for the structure they support.

In addition to providing structural support, dwarf walls can also serve as a decorative element in a commercial building. They can be finished with a variety of materials, such as plaster, paint, or tiles, to create a visually appealing appearance.

An easement is a legal right to use another person's land for a specific purpose, without owning it. In commercial construction projects in Australia, easements are commonly used for utilities such as water, electricity, and telecommunications. They can also be used for access, drainage, and other purposes. Easements are typically created through a deed or agreement between the landowner and the person or entity that will benefit from the easement. The terms of the easement, including its location, purpose, and duration, are set out in the deed or agreement. Easements can impact the development potential of a property, as they can restrict the use of the land and limit the types of structures that can be built on it. It is important for commercial construction projects to carefully consider the potential impact of easements on their plans and to work with experienced legal and planning professionals to navigate any issues that may arise.

In commercial construction projects in Australia, an "eave" refers to the overhanging edge of a roof that extends beyond the exterior walls of a building. It provides protection from the elements, such as rain and sunlight, and can also contribute to the building's aesthetic appeal.

Eaves can vary in size and design depending on the architectural style and functional requirements of the building. They can be simple and straightforward or more decorative, with features like brackets, moldings, or other architectural elements.

Efflorescence is a common occurrence in commercial construction projects in Australia, particularly in buildings with concrete, brick, or masonry structures. It refers to the formation of white, powdery deposits on the surface of these materials, which are caused by the migration of soluble salts to the surface.

When water penetrates the pores of concrete, brick, or masonry, it dissolves the salts present in the materials. As the water evaporates, the salts are left behind on the surface, creating the white deposits known as efflorescence. This process can be triggered by various factors, such as moisture ingress, poor drainage, or high humidity levels.

a plumbing or electrical fitting that lets you change directions in runs of pipe or conduit.

Electrical rough-in is a crucial stage in the construction process of commercial buildings in Australia. It involves the installation of electrical systems and components before the walls, ceilings, and floors are finished. The main goal of electrical rough-in is to ensure that all electrical wiring, conduits, and boxes are properly installed and concealed within the building structure.

During the electrical rough-in stage, electricians work closely with other trades, such as carpenters and plumbers, to coordinate the installation of electrical components with the overall construction progress. They follow building codes, industry standards, and project specifications to ensure the electrical system's safety, functionality, and compliance.

In the context of commercial construction projects in Australia, "elevation" refers to a scaled drawing or representation of one side of a building or structure. It is a crucial component of architectural and engineering plans, providing a detailed view of the exterior aspects of the building from a specific angle, typically the front, rear, or sides.

In commercial construction projects in Australia, "engaged columns" (also known as "engaged piers") refer to vertical structural elements that are partially embedded or integrated into a wall. Unlike freestanding columns, engaged columns are bonded to the wall and often project partially from its surface. These columns provide additional structural support and stability to the wall and the overall building structure.

In Australia, an engineer in commercial construction projects is a professional who applies their expertise and knowledge to design, plan, and oversee the construction of buildings and infrastructure projects. According to , professional engineers have the skills to focus on overall systems, develop and apply new engineering practices, and apply leadership and management skills.