The cost of building a 60-square-metre granny flat on the Central Coast typically ranges between $187,000 and $235,000. Custom designs, high-end finishes, and unique features can increase these costs. Factors such as the size, location, and condition of your block of land, as well as compliance with Central Coast Council and other local council requirements, will also impact the overall budget. Additionally, your design and material selections can significantly influence costs, affecting finishes, engineering, and compliance.