Property Glossary
Dual occupancy means two separate dwellings on a single lot — typically a main home and a secondary or auxiliary dwelling. It can add significant value and rental income potential to a property. But whether it is permitted, and on what terms, depends entirely on the zone and lot characteristics.
Dual occupancy refers to the development of two separate dwellings on a single lot. In Queensland's planning framework, this can take several forms depending on the applicable planning scheme and zone code:
A secondary dwelling — sometimes called an auxiliary dwelling or granny flat — is a self-contained dwelling that is secondary to the main dwelling on the lot. It must typically be smaller than the primary dwelling, be on the same lot and title, and comply with specific size, setback and design requirements set out in the relevant zone code. A secondary dwelling does not create a separate title — the lot remains one property.
In some planning schemes, dual occupancy refers specifically to two dwellings of similar scale on a single lot — not the secondary-to-primary relationship of an auxiliary dwelling. This distinction matters because the assessment pathway and requirements may differ.
A property with a secondary dwelling does not automatically have subdivision potential. Formally creating two separate lots — each with its own title — requires a reconfiguration of lot (subdivision) approval, which is subject to minimum lot size requirements, infrastructure charges and other planning conditions. The existence of a secondary dwelling does not mean subdivision is achievable.
The terms granny flat, secondary dwelling, auxiliary dwelling, dual occupancy and secondary residence are used interchangeably in common usage — but they have specific meanings in planning schemes that can differ. Always refer to the relevant zone code and planning scheme definitions when assessing a specific property.
Buyers are attracted to dual occupancy potential for two main reasons: rental income from the secondary dwelling, and the longer-term option value of having a second dwelling on the lot for family members or future flexibility.
Zone permits dual occupancy: Check the applicable zone code to confirm whether a secondary dwelling is a permitted use (accepted development) or requires assessment (assessable development). In some zones, dual occupancy is prohibited.
Lot size meets the minimum: Most zone codes specify a minimum lot size for dual occupancy. A property that appears to have room for a secondary dwelling may not meet the minimum lot size threshold — particularly in established suburbs with smaller lots.
Existing secondary dwelling is lawfully approved: If a property is marketed as having an existing granny flat or secondary dwelling, verify it was built with a proper building approval. Unapproved structures create compliance risk and may need to be removed or retrofitted. Request the building approval documentation.
Setbacks and site cover can accommodate a second dwelling: Even where dual occupancy is permitted, the remaining site constraints — setbacks, existing site cover, height limits — must be able to accommodate the secondary dwelling. A town planner or building certifier can assess feasibility.
For strata title (body corporate) properties, the ability to add a secondary dwelling or convert existing space is typically restricted by body corporate by-laws and requires lot owner approval through the body corporate. Confirm with the body corporate before purchasing with this intention.
Dual occupancy and secondary dwellings in Noosa are governed by the Noosa Plan 2020. The rules vary across the shire's different zones and are more restrictive in some areas than buyers often expect.
In the Low Density Residential Zone — which covers most of Noosa's established residential areas — secondary dwellings are generally permitted as accepted development subject to complying with the zone code. Requirements typically include a minimum lot size, maximum secondary dwelling size relative to the primary dwelling, setback compliance and design consistency with the primary dwelling.
In the Rural Residential Zone, secondary dwellings are also generally permitted on larger lots, reflecting the larger lot sizes and the lifestyle nature of these properties. The hinterland acreage properties in Doonan, Verrierdale and surrounding areas frequently have existing secondary dwellings or clear potential to add one.
In character overlay areas — covering parts of Noosa Heads, Sunshine Beach and other established suburbs — additional design requirements may apply to secondary dwellings to ensure consistency with the existing neighbourhood character.
The short stay letting of secondary dwellings in Noosa is subject to the same rules as the short stay letting of primary dwellings — zone, short stay accommodation area designation and Home Hosted Accommodation rules all apply. Do not assume a secondary dwelling can be operated as a short stay rental without specific verification.
Whether a property can lawfully accommodate a secondary dwelling depends on zone, lot size and site constraints. We help buyers understand the planning reality before the purchase price is set.