How Much Does It Cost to Build a Duplex in Australia? [2026 Guide]

Quick Answer: Building a duplex in Australia typically costs between $600,000 and $1,200,000 in 2026. That’s $2,000 to $3,800 per square metre, excluding land. Top 5 Duplex Building Costs You Need to Know What Exactly Is a Duplex? I get this question a lot. A duplex is two homes under one roof. Each unit has […]