Granny Flat Costs
Typical build costs:
- 1 bedroom (40-45m²): $80,000-130,000
- 2 bedroom (55-65m²): $100,000-160,000
- 2 bed + study (70-80m²): $130,000-200,000
What's Included
Standard granny flat includes:
- Council approvals
- Site preparation
- Slab foundation
- Full construction
- Kitchen and bathroom
- Electrical and plumbing connections
- Basic landscaping
Additional Costs
- Site slope: +$5,000-20,000
- Sewer extension: +$5,000-15,000
- Power upgrade: +$2,000-5,000
- Premium finishes: +$20,000-50,000
- Landscaping: +$5,000-20,000
Council Requirements
- Maximum 60m² in most areas (NSW up to 60m²)
- Must meet setback requirements
- Private open space required
- Parking may be required
- Cannot be separately sold (attached to main dwelling)
Kit vs Custom
Kit/Prefab
Pros: Faster, fixed price, fewer surprises
Cons: Limited customisation, may not suit site
Custom Build
Pros: Designed for your site, any layout
Cons: Takes longer, potential cost overruns