Dual occupancy rules in South Australia (2026)
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.
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 | In the General Neighbourhood Zone the deemed-to-satisfy figure is 300 m² per semi-detached dwelling, 250 m² per row dwelling, and 300 m² average (including common areas) for group dwellings (indicative - the Code sets it per zone and Technical and Numeric Variations mapped to your allotment override it). |
| Minimum frontage per dwelling | In the General Neighbourhood Zone, 9 m per semi-detached dwelling, 7 m averaged for row dwellings, and 15 m of total site frontage for group dwellings (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. |
Conditions & eligibility
- The allotment must meet the minimum site area and frontage per dwelling set for your zone.
- Technical and Numeric Variations mapped to your allotment override the zone default figures.
- No deemed-to-satisfy criteria are provided for group dwellings, so those are always performance assessed.
- Site coverage, private open space, car parking and setback criteria in the Code must be met.
- Overlays such as Historic Area, Character Area, Heritage Adjacency, Flooding and Hazards (Bushfire) add criteria and can remove the deemed-to-satisfy pathway.
- Land division consent to create two saleable titles is a separate application.
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.
How approval works in South Australia
Development in South Australia needs planning consent and building consent, issued together as a development approval. If the proposal meets the deemed-to-satisfy criteria for your zone, an accredited professional or the council must grant planning consent - no merit judgement and no public notification. If it does not, it is performance assessed against the Code by the council assessment panel or an assessment manager, and may be notified to neighbours.
Minimum site areas and frontages are varied council by council through Technical and Numeric Variations, so the same zone can require one figure in one suburb and a noticeably different one in the next.
Dual occupancy rules by council in South Australia
Local councils apply the South Australia framework and can add their own controls. Pick your council:
Frequently asked questions
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 the deemed-to-satisfy figures are 300 m² of site area and 9 m of frontage per semi-detached dwelling, so about 600 m² and 18 m of frontage for two. Look your allotment up on SAPPA to see the exact figures that apply, because a Technical and Numeric Variation can change them.
Can I split the title on two dwellings in South Australia?
Yes, but it is a separate approval. Two dwellings can be built on one title with planning and building consent alone. Creating two saleable titles requires land division consent - Torrens title where the allotments are fully independent, or community title where a driveway, shared services or common property is involved, which also creates a community corporation with ongoing obligations.
Do I need council approval for a duplex in SA?
You need development approval, which combines planning consent and building consent. If the design meets the deemed-to-satisfy criteria for your zone, an accredited professional can grant the planning consent quickly and without neighbour notification. If it does not, the council assesses it on its merits against the Planning and Design Code and may notify neighbours.
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
This is general guidance, not professional planning advice. Figures are summarised from the sources above and can change — confirm with your council or the PlanSA before starting work. Last reviewed: July 2026.
Talk to a town planner in South Australia
This page covers the general rules. A qualified town planner can tell you what applies to your actual block — the zone, the overlays and the approval path — before you spend money on drawings.
- Qualified, practising town planners
- Advice on your property, not a generic rule
- No cost, no obligation