How much does a granny flat really cost?
Get an instant cost estimate tailored to your state, size, and build type. Based on real pricing data from Australian builders.
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1. Enter your location
Your postcode determines state regulations, approval pathway, and local cost adjustments.
2. Configure your build
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See a detailed cost breakdown with approval pathway, timeline, and state-specific notes.
Typical granny flat costs in 2026
Based on our analysis of 10+ Australian builder websites. Prices are for site-built, standard finish, flat site.
Studio (25sqm)
$80k - $120k
$3,200 - $4,800 per sqm
1 Bedroom (40sqm)
$120k - $180k
$3,000 - $4,500 per sqm
2 Bedroom (60sqm)
$160k - $250k
Most popular size
3 Bedroom (80sqm)
$180k - $300k
Requires DA in most states
Popular guides
Research costs, regulations, and financing before you build. All guides are based on current 2026 data.
Granny flat cost in Sydney
Full price breakdown by build type, size, and area. Updated for 2026.
RegulationsGranny flat rules in NSW
CDC vs DA, size limits, setbacks, and rental rules under SEPP Housing 2021.
CostsHow to finance a granny flat
Compare equity, construction loans, personal loans, and what banks actually need.
PlanningCDC vs DA approval explained
When you can skip council, what each pathway costs, and how long each takes.
CostsGranny flat rental income & ROI
Rental yields by city, ROI calculations, and tax deductions you can claim.
PlanningHow to choose a builder
Licensing checks, questions to ask, red flags, and a comparison checklist.
Transparent, research-backed estimates
We don't guess. Every cost figure is derived from published builder prices, state government fee schedules, and industry data.