Dual occupancy rules in Adelaide
Building a dual occupancy in Adelaide? City of Adelaide applies the South Australia planning framework. Here's what that means locally — plus the overlays worth checking on your specific block.
Allowed in most residential zones, subject to site area and frontage per dwelling
Often yes. The Planning and Design Code treats two homes on one allotment as semi-detached dwellings, a group dwelling or a residential flat building, and each zone sets a minimum site area and frontage per dwelling - so the zone and the numbers mapped to your allotment decide it.
Key rules at a glance
| Minimum site area per dwelling | Commonly 300-400 m² for semi-detached dwellings in the General Neighbourhood Zone (indicative - the Code sets it per zone and it is varied by Technical and Numeric Variations mapped to your allotment). |
| Minimum frontage per dwelling | Commonly 9-10 m for semi-detached dwellings. Group dwellings usually need a wider site frontage, commonly around 15 m (indicative - varies by zone and TNV). |
| Zones permitted | The General Neighbourhood, Suburban Neighbourhood, Housing Diversity Neighbourhood, Urban Neighbourhood and Established Neighbourhood zones commonly envisage semi-detached or group dwellings - check the zone mapped to your allotment. |
| Approval pathway | Deemed-to-satisfy consent from an accredited professional or council where the criteria are met, otherwise performance assessed by the council. |
| Can it be subdivided or community titled? | Two dwellings can sit on one title with just planning and building consent. Creating separate titles needs a further land division consent - Torrens where the allotments are fully independent, or community title where a driveway, services or common area is shared. |
| Typical timeframe | Often a few weeks for a deemed-to-satisfy assessment; commonly 2-4 months when performance assessed and notified. |
Heritage, flood and bushfire controls on your specific lot can remove the fast-track and require a full application — even when the general rules say you're fine.
Dual occupancys in Adelaide
City of Adelaide is the authority for Adelaide in Adelaide. The statewide South Australia rules above set the baseline; the council can apply extra local controls, and heritage, flood or bushfire overlays on your lot can change what's allowed.
Frequently asked questions
Do I need council approval for a dual occupancy in Adelaide?
Usually yes. In South Australia, a dual occupancy generally needs an application, and City of Adelaide is the authority that assesses it. See the full state rules for the pathway and what's required.
Which council approves a dual occupancy in Adelaide?
City of Adelaide is the consent authority for Adelaide (Adelaide). You can review local planning controls on the council website and lodge through your state planning portal.
What size block do I need for two houses in Adelaide?
It depends on the zone and the Technical and Numeric Variation mapped to your allotment. In the General Neighbourhood Zone a semi-detached dwelling commonly needs about 300-400 m² of site area and 9-10 m of frontage per dwelling, so roughly 600-800 m² in total. Look your allotment up on SAPPA to see the exact figures that apply.
Sources
- Planning and Design Code - PlanSA ↗
- Guide to the Planning and Design Code (PDF) - PlanSA ↗
- South Australian Property and Planning Atlas (SAPPA) ↗
Related building rules
General guidance only — not professional planning advice. Local requirements in Adelaide can differ from the statewide summary and change over time; always confirm with City of Adelaide before starting work. Last reviewed: July 2026.
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