In Australia, architects’ professional fees vary based on how they want to charge you, which are either percentage or fixed fees. In a percentage system, they can ask for 5% to 18% of the house’s total cost. For example, if your project’s total cost is $300,000 and your hired architect applies a 10% fee, your architect gets $30,000.Meanwhile, fixed fees typically cover the cost of renovations. Some architects charge hourly. They usually charge $50 to $120 per hour. Your project’s complexity, location, Tasker’s experience, and more also greatly affect the final rate.