How Much Do Home Extensions Cost in Sydney? (2026 Guide)
If you love your location but need more space, a home extension is one of the best ways to upgrade your lifestyle without moving. But how much does it cost?
Here’s the full breakdown.
Average Home Extension Cost in Sydney
Most extensions fall between:
$80,000 – $450,000+
Depending on size, complexity and finishes.
Learn more: Home Extensions Sydney
Cost Breakdown by Extension Type
1. Single‑Room Extension
$40,000–$90,000 Ideal for bedrooms, studies or small living areas.
2. Open‑Plan Living Extension
$120,000–$250,000 Includes kitchen, dining and living expansion.
3. Ground‑Floor Extension
$150,000–$350,000+ Adds significant living space.
4. Second‑Storey Addition
$180,000–$450,000+ Best for growing families who don’t want to lose backyard space. Learn more: Second‑Storey Additions Sydney
Factors That Affect Extension Costs
Structural changes
Roof modifications
Plumbing & electrical
Access for trades
Materials & finishes
Council requirements
Extension vs Moving House
Extensions are often cheaper than:
Stamp duty
Agent fees
Moving costs
Buying a larger home
How to Save Money on Extensions
Keep plumbing in existing locations
Choose cost‑efficient materials
Avoid unnecessary structural changes
Use standard window and door sizes
Start Your Extension Project Today
Credible Homes designs and builds high‑quality extensions across Sydney.