What size should I build my Granny Flat for a rental?

Great question—when it comes to rental investment in Queensland, granny flat size matters. You want something big enough to attract tenants, but small enough to stay within council rules and budget. Here’s the sweet spot:

 

Ideal Size for Rental Granny Flats in QLD

1. Council-Approved Range

  • Most councils in Queensland allow granny flats between 45m² and 80m² without needing a full development application.
  • In some cases, you can go up to 90m² or even 100m², but this may require extra approvals.

2. Best Size for Rental Appeal

  • 60m² to 70m² is often considered the “goldilocks zone”:
    • Big enough for a 1–2 bedroom layout, which appeals to singles, couples, and small families.
    • Small enough to keep construction costs and council scrutiny manageable.

3. Studio vs. 2-Bedroom

Size Range Typical Layout Rental Appeal
40–50m² Studio or 1-bedroom Budget-conscious singles
60–70m² 1–2 bedrooms + living Couples, small families, remote workers
80–100m² 2 bedrooms + extras Premium tenants, higher rent

Cost vs. Return

  • Build costs range depending on the size and finishes you choose.
  • A well-designed 60–70m² granny flat in Brisbane can earn $400–$600/week in rent.
  • That’s a solid yield—especially if you already own the land.

Pro Tip

If you’re aiming for maximum rental flexibility, go for:

  • Separate access
  • Private outdoor space
  • Independent utilities (water, electricity, gas)