Queensland Granny Flat Rules: Can You Rent Out a Secondary Dwelling in 2026?

Yes -- and the rule change that made this possible is one of the most underutilised income-boosting strategies available to Queensland property investors. On 26 September 2022, the Queensland Government amended the Planning Regulation 2017 to remove the historical restriction that limited secondary dwelling occupancy to relatives or household members of the primary dwelling. Homeowners can now lawfully lease out a granny flat to anyone under a standard tenancy agreement.

For investors targeting dual-income properties in Brisbane's outer growth corridors -- Logan, Ipswich, Moreton Bay -- this opens up a strategy that can materially improve cash flow on a single lot.

What Changed in 2022

Before the amendment, a secondary dwelling (granny flat) on a residential lot could only be occupied by a family member or someone connected to the household in the primary dwelling. Renting it out to an independent tenant was not permitted, which made granny flats effectively useless for income-focused investors.

The 2022 amendment removed this restriction statewide. Under the updated rules, homeowners can lease secondary dwellings to any tenant under a standard residential tenancy agreement, governed by the Residential Tenancies and Rooming Accommodation Act 2008.

This means a single investment property can generate two separate rental incomes: one from the main house and one from the granny flat. On a property in Redbank Plains or Boronia Heights where the main house rents for $450-$500 per week and a compliant granny flat rents for $250-$350 per week, the combined gross yield on a $600,000-$700,000 property can reach 5.5-6.5% -- well above what a single-dwelling property delivers in the same suburb.

Secondary Dwelling vs Dual Occupancy

The distinction between a "secondary dwelling" and a "dual occupancy" is critical under Queensland planning law, and getting it wrong has serious consequences:

Secondary dwelling: An accommodation unit that is subordinate to and used in conjunction with a primary dwelling house on the same lot. It cannot be subdivided or sold separately. It must remain ancillary to the main dwelling. If it meets the local council's size and setback requirements, it can typically be built as accepted development (no formal development approval required), and no infrastructure contribution levies apply.

Dual occupancy (duplex): Two distinct, self-contained dwellings on the same lot that can be of similar size and can potentially be subdivided. Building a dual occupancy requires full development approval, building certifications, and substantial infrastructure contribution levies that can add tens of thousands of dollars to the project cost.

For investors, the secondary dwelling pathway is significantly cheaper and faster than dual occupancy. But the dwelling must genuinely be subordinate to the primary residence in terms of size and function.

Council Size Limits

Each local council sets its own size caps and design requirements for secondary dwellings. These vary and must be checked at the council level:

• Gold Coast City Council caps secondary dwellings at 80sqm of gross floor area and requires the granny flat to be within 10-20 metres of the primary residence.
• Brisbane City Council, Ipswich, Logan, and Moreton Bay councils each have their own maximum floor area and setback requirements.

As a general guide, most councils allow secondary dwellings of 50-80sqm, which is sufficient for a comfortable 1-2 bedroom unit. The dwelling must comply with the local planning scheme's setbacks, site coverage ratios, and private open space requirements.

The Compliance Trap for Existing Granny Flats

If a granny flat already exists on the property you are purchasing, and it was built under an older approval that restricted occupancy to family members, transitioning to third-party rental can trigger a building compliance assessment.

This is the compliance trap: the transition from family-only occupancy to independent rental may require the granny flat to meet current National Construction Code standards for fire separation and sound insulation between the primary and secondary dwellings. If the existing structure does not meet these standards, you face a retrofit cost to bring it into compliance.

The building must be inspected by a licensed private building certifier, who issues a Form 29 (Compliance advice for building work). Leasing a non-compliant secondary dwelling is an offence that:

• Voids your landlord insurance policy
• Exposes you to significant personal liability for tenant injury
• Can result in council fines

Before buying a property with an existing granny flat for dual-income purposes, verify the compliance status of the secondary dwelling. If it was built under the old family-member-only rules, budget for a building certifier assessment and possible fire separation upgrades.

Utility Metering

Under the Residential Tenancies and Rooming Accommodation Act 2008, the tenancy agreement for a secondary dwelling must explicitly outline how utilities are measured and billed.

Unless the granny flat has its own individual meters for electricity and water, you cannot legally charge the tenant for consumption. If the secondary dwelling shares meters with the main house, the only option is a pre-agreed sharing formula written into the tenancy agreement, or the landlord absorbs the utility cost as part of the rent.

For new secondary dwelling constructions, installing separate metering from the outset is strongly recommended. The upfront cost of separate metering ($2,000-$4,000 depending on the utility) is quickly recovered through the ability to pass consumption costs to the tenant.

Making the Numbers Work

The dual-income strategy works best on properties with:

• Large lots (600sqm+) that can accommodate a secondary dwelling within setback requirements
• Established houses in the outer growth corridors (Logan, Ipswich, Moreton Bay) where block sizes are generous and entry prices are lower
• Council areas with favourable secondary dwelling policies and reasonable size caps

The rental income from a secondary dwelling is assessable income and must be declared. But the construction or renovation cost of the granny flat generates additional depreciation deductions under both Division 43 (building structure) and Division 40 (plant and equipment for new items), which partially offset the tax on the additional income.

Our Queensland Investment Property Guide includes a dual-income feasibility calculator that models the combined yield from main dwelling plus secondary dwelling, accounting for construction costs, depreciation benefits, land tax impact, and utility metering requirements.

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