Most Queensland homeowners who have a granny flat — or space for one — want to know the same thing: can it earn income, and how? The short answer is yes, potentially — but the path depends on your property, your council, and what income model you choose.
What qualifies as a granny flat in Queensland?
In Queensland, a granny flat is classified as a secondary dwelling — a self-contained residential unit on the same lot as a principal dwelling. It must have its own kitchen, bathroom, and sleeping area. Planning rules vary by local government area (LGA). Brisbane City Council, for example, has specific provisions for secondary dwellings including lot size minimums and setback requirements. Other LGAs — Logan, Ipswich, Gold Coast, Sunshine Coast — each have their own rules. Never assume the same rules apply across councils.
Do you need council approval?
In most cases, yes. A new secondary dwelling in Queensland typically requires a development application (DA) or, in some cases, building approval under the self-assessable code pathway. You'll also need plumbing compliance, smoke alarm compliance, and an NCC-compliant build. If you're converting an existing structure (a garage, sunroom, or underhouse space), those same compliance requirements apply — plus a building inspection. Engaging a planning consultant or certifier early can save significant time and money.
How much income can a granny flat earn?
Rental income for a granny flat varies considerably depending on size, location, condition, and the local rental market. Typical ranges: $250–$350/week in outer suburban areas, $350–$450/week in inner suburban or coastal markets. That's $13,000–$23,400 gross per year. Against that, factor in: property management (if used), maintenance, depreciation, insurance. The net yield depends heavily on what the construction cost or compliance cost was to set up the dwelling.
Tax treatment of granny flat rental income
Rental income from a granny flat is assessable income — declared on your tax return, same as any investment property. You can deduct expenses attributable to the granny flat: depreciation, a portion of rates and insurance, maintenance, and property management fees. If the main property is your principal residence, you may lose part of the main residence CGT exemption on eventual sale. This is a material consideration — speak to your accountant before proceeding.
The co-living alternative
Building a granny flat requires capital outlay, council approvals, and time — often 6–18 months from concept to first rent collected. There's an alternative income model that doesn't require construction: rooming accommodation or co-living, applied to the main dwelling itself. Under a managed co-living model, individual rooms within the principal dwelling are let separately — typically yielding materially higher gross income than a single-tenant lease.
Eleva's property income model can potentially deliver above-market returns — without a building project.
See how the income model works →Building a granny flat vs restructuring the income model
The economics of a granny flat depend heavily on the build cost. A compliant secondary dwelling in Queensland typically costs $120,000–$250,000 to construct, depending on size, site conditions, and finish. At $350/week gross income, that's a 7.3–12% gross yield before costs — which sounds reasonable until you factor in financing, vacancy, and the time value of money during the approval and construction period. If the goal is income, it's worth modelling the co-living alternative on a side-by-side basis before committing to a build.