How Much Does It Cost To Build A Dual Occupancy Development?
PJ Cook2026-07-16T13:55:58+10:00Discover how much it costs to build a dual occupancy on the Central Coast in 2026, including realistic price ranges for house and granny flat, dual key, and duplex designs. Most quality, turnkey projects start from around $635,000, with larger developments exceeding $1,100,000 ex GST. Learn what affects build costs, potential rental returns, and why these projects are popular with investors.








