Sydney residential construction is now running at $2,800 to $3,800 per square metre for mid-range spec and $3,800 to $6,000-plus for premium or architect-designed builds (Buildana, 2026). A duplex on two 150sqm dwellings sits at $600,000 to $840,000 in construction cost alone before civil works, contributions, or professional fees are touched.
The Altus Group Q1 2026 construction price outlook puts Sydney at 6.5% cost escalation for the year, revised up from an earlier forecast of 4.5%. The same 250sqm home quoted at $680,000 in May 2025 is now $710,000 to $725,000 on identical specifications. Material cost movements driving that: concrete up 6.1%, electrical labour up 6.8%, plumbing labour up 5.1%, timber framing up 3.8%. Copper is up 25% year-to-date. Diesel jumped 41% in March alone, and diesel is a cost multiplier across every material that gets trucked to a site.
Budget 10 to 15% contingency on top of whatever number you get. Tree removal, retaining walls, stormwater redesigns, unexpected soil conditions, survey amendments: these show up on nearly every project and they are not small items.