What it costs in 2026
- Studio (1BR, ~45sqm): $95,000 – $160,000
- 1BR self-contained (~60sqm): $145,000 – $220,000
- 2BR self-contained (~80sqm): $195,000 – $310,000
Add $10k – $40k for site works, connections and landscaping.
Council rules to know
- Most SA councils allow a "dependent persons unit" up to 60sqm without full development approval - depends on zoning
- Renting to non-family generally requires a Land Division or separate title - much bigger process
- Minimum block size varies by council (typically 700+ sqm)
- Setbacks, driveway, parking and effluent disposal all apply
The rental-income question
Renting to a family dependent is universally permitted. Renting to a stranger for cash usually requires a formal secondary dwelling approval and possibly a subdivision. Speak to your council BEFORE you build if rental income is core to the plan.