How Much Does a Granny Flat Cost in NSW? (2026 Guide)

Building a granny flat in NSW in 2026 typically costs $2,000–$3,800 per m² for construction alone. A 60 m² mid-range granny flat may cost around $144,000–$168,000 to build, or roughly $175,000–$230,000 on a flat block once site works, approvals, council contributions and contingency are included. Design, connections and landscaping are additional.