Queensland's secondary dwelling rules changed substantially in September 2022. Statewide reforms removed the previous restriction that secondary dwellings (granny flats) could only be rented to family members. Homeowners can now rent a granny flat to anyone, in most circumstances. But whether a secondary dwelling can be built on your property, and whether it requires a development application, still depends on the local planning scheme, the lot size, and the applicable overlays.
What is a secondary dwelling
A secondary dwelling is a self-contained dwelling located on the same lot as a principal dwelling. It typically shares the title with the main house and cannot be sold separately. Most planning schemes define a secondary dwelling by both location (on the same lot, within a specified distance of the main dwelling) and size (commonly capped at 80 square metres of gross floor area).
The secondary dwelling category is distinct from a dual occupancy, which involves two equally-sized dwellings on a lot and is treated very differently under most planning schemes. If a proposed second dwelling is over the size threshold, or detached and not clearly subordinate to the main house, it may be assessed as a dual occupancy rather than a secondary dwelling.
When you need approval
In many Queensland local government areas, including Brisbane City Council in some zones, a secondary dwelling under 80m² is accepted development. That means no planning application is required, provided the proposal meets every relevant code in the planning scheme. Building approval is still required (issued by a building certifier).
Where a secondary dwelling triggers a planning application, the most common reasons are: the dwelling exceeds 80m²; the lot is in an overlay that requires assessment (character, heritage, flood, environmental); the dwelling does not meet siting, setback, or height standards; or the property is in a zone where secondary dwellings are not accepted development.
The 2022 rental rule change
Before September 2022, Queensland planning schemes commonly restricted secondary dwellings to occupation by a household member, typically defined as a relative or someone in the same household. State-level reforms removed this restriction and overrode planning schemes on this point, allowing secondary dwellings to be rented to anyone in most cases.
The change has unlocked secondary dwellings as an income-generating asset for homeowners, which has driven a substantial increase in interest. It does not, however, override other planning controls, overlays, size limits, setbacks and zone-specific provisions still apply, and short-term accommodation use (Airbnb-style) is treated separately.
Practical implications
If you are considering a secondary dwelling, a structured pre-application review covers: the zone and applicable overlays; whether the proposed dwelling is accepted, code or impact assessable; siting standards (setbacks, height, location relative to main dwelling); minimum lot size; access, parking and infrastructure; and how any overlays affect what can be built.
It is also worth being clear about your intended use. Rental for long-term residential is treated differently from use as short-term accommodation. The latter often triggers a separate planning consideration even if the building itself is permissible.
Secondary dwellings remain one of the most cost-effective ways to add residential capacity to an existing site, particularly given the 2022 rental change. The article on dual occupancy explains the alternative pathway when a larger second dwelling is contemplated.