How much does a ground floor extension cost in Sydney's south?

Ground floor extension costs in Sydney's southern suburbs typically range from $2,500 to $4,500 per square metre, depending on the level of finishes, structural complexity, and site conditions. A basic 20-square-metre extension might cost between $50,000 and $70,000, whilst a premium 40-square-metre extension with high-end finishes could range from $140,000 to $180,000 or more.

Several factors significantly impact the final cost, including the need for structural engineering, complexity of connecting to existing services, quality of fixtures and fittings, and site access for construction. Extensions requiring significant excavation, retaining walls, or complex roofing solutions will cost more than straightforward single-level additions on flat sites.

Additional costs to budget for include council fees, design and engineering services, temporary accommodation if needed, and potential upgrades to existing areas to match the new extension. At Curtis Construction, we provide detailed, transparent quotes that break down all costs, helping you make informed decisions about your investment. We offer free site inspections and quotes to give you an accurate understanding of your project's scope and cost.