How much does an upper floor extension cost?

Upper floor extension costs vary significantly depending on size, design complexity, materials, and site-specific factors. In the Sutherland Shire, typical costs range from $2,500 to $4,000 per square metre for quality construction, though luxury finishes and complex structural requirements can increase this figure.

Key cost factors include structural engineering requirements, foundation strengthening, roof modifications, staircase installation, plumbing and electrical work, and finishing materials. Extensions over existing structures often cost more than those built over concrete slabs due to additional structural considerations.

The most accurate way to determine your project cost is through a detailed site inspection and consultation. Curtis Construction offers free quotes that account for your specific requirements, site conditions, and desired finish quality, ensuring you receive transparent pricing without hidden surprises.