In commercial construction projects in Australia, a door frame refers to the structural element that surrounds and supports a door. It is an essential component that ensures the door operates correctly and provides security, stability, and aesthetic appeal.

The door frame typically consists of several parts, including:

1. Head (or Lintel): The horizontal top part of the frame.
2. Jambs: The vertical sides of the frame.
3. Sill (or Threshold): The horizontal bottom part of the frame, though this is more common in exterior doors.
4. Stop: A strip of wood or metal that prevents the door from swinging through the frame.

In commercial construction, door frames can be made from various materials, including:

• Timber: Common in interior applications for its aesthetic appeal.
• Steel: Often used in high-traffic or high-security areas due to its strength and durability.
• Aluminium: Frequently used in modern commercial buildings for its lightweight and corrosion-resistant properties.

Door frames in commercial settings must comply with Australian Standards and Building Codes, such as the National Construction Code (NCC) and relevant Australian Standards (e.g., AS 1905.1 for fire-resistant doorsets). These regulations ensure that door frames meet specific requirements for safety, fire resistance, accessibility, and durability.

Additionally, door frames in commercial projects may need to accommodate various hardware components, such as hinges, locks, and door closers, and may be designed to support different types of doors, including solid core, hollow core, fire-rated, and acoustic doors.