Free Tool
Building Cost CalculatorSydney 2026
Get an instant estimate for your construction project. Custom homes, duplexes, granny flats, knockdown rebuilds — tailored to your LGA.
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Sydney Building Costs at a Glance
Average construction costs per square metre in 2026, excluding land, fees, and GST
Custom Home
$2,400 – $3,700/m²
220m² = $528k – $814k
Duplex
$2,200 – $3,400/m²
350m² = $770k – $1.19M
Knockdown Rebuild
$2,500 – $3,900/m²
240m² = $600k – $936k
Granny Flat
$2,800 – $4,300/m²
50m² = $140k – $215k
Townhouse
$2,100 – $3,250/m²
450m² = $945k – $1.46M
Boarding House
$2,000 – $3,100/m²
500m² = $1M – $1.55M
Frequently Asked Questions
Google Reviews
5.0
“Buildana built our granny flat in just 12 weeks. Fast approvals, great communication, and a beautiful final product. Highly recommend.”
Fatima Al-Rashid
Liverpool, NSW
See all reviews on Google
Areas We Serve
Building Across Western Sydney
Buildana is your trusted local builder across Fairfield, Liverpool, and Cumberland LGAs.