In Australia, whether you need planning permission for a 4 metre extension depends on your state, your local council, and the specifics of your property.
Many residential extensions fall under what is known as complying development or exempt development, which means they can proceed without a full development application as long as they meet certain criteria around setbacks, height, site coverage, and other rules.
A 4 metre rear extension may qualify as complying development in many situations, but this is not guaranteed and varies depending on zoning, the character of the area, and whether your property has any overlays or restrictions on it. It is always worth checking with your local council or engaging a professional before assuming approval is automatic.
Mitroteam Projects can help you understand the approvals process and make sure your project is set up correctly from the start.