Granny Flat Rules South Australia: Complete 2026 Guide

TL;DR: South Australia now allows self-contained granny flats up to 70sqm that can be rented to anyone — not just family. Known officially as “ancillary accommodation” under the Planning and Design Code, SA granny flats must share utility connections with the main dwelling, sit on the same lot, and have no more than 2 bedrooms. Development approval is always required, but a streamlined Deemed-to-Satisfy pathway exists for properties meeting specific criteria.

Key takeaways

• SA granny flats are called “ancillary accommodation” under the Planning and Design Code.
• Maximum floor area increased from 60sqm to 70sqm under recent reforms.
• Self-contained granny flats (own kitchen, bathroom, laundry) are now permitted.
• Rental to anyone is now legal — the family-only restriction has been removed.
• All granny flats must share utility connections (electricity, water, sewer) with the main dwelling.
• Development approval is always required — there is no exempt pathway.
• A faster Deemed-to-Satisfy (DTS) approval pathway exists for qualifying properties.
• Use the grannyflatcost.com calculator to estimate your total SA granny flat build cost including council fees, site prep, and connections.

What is “ancillary accommodation” in South Australia?

In South Australia’s planning system, what most people call a “granny flat” is officially classified as ancillary accommodation. This matters because the rules, approval pathways, and size limits all reference this specific term in the Planning and Design Code.

The legal definition requires ancillary accommodation to be:

• Subordinate to the primary dwelling on the same allotment
• No more than 2 bedrooms
• Connected to the same utilities as the main dwelling (no separate connections)
• Self-contained or not — the recent reform makes this optional

Your granny flat cannot function as a completely independent dwelling with its own utility meters. It must remain linked to the main house’s electricity, water, gas, sewer, and telecommunications connections.

Recent SA granny flat reforms (2023–2026)

South Australia has made several significant changes to granny flat rules in recent years, driven by housing affordability pressures. These are some of the most meaningful changes to SA planning law in decades.

Self-contained living now allowed

Previously, SA granny flats could not be self-contained — they had to share a kitchen, bathroom, or laundry with the main house. This made them impractical for tenants or elderly parents who wanted privacy.

Under the reformed definition, ancillary accommodation “can be (but need not be) self-contained.” Your granny flat can now include its own kitchen or kitchenette, bathroom and toilet, and laundry facilities.

This single change has transformed the viability of granny flats in SA. They went from largely impractical family add-ons to genuine independent living spaces.

Size increase: 60sqm to 70sqm

The maximum floor area under the performance-assessed pathway has gone from 60sqm to 70sqm. An extra 10sqm makes a real difference — enough to comfortably fit a second bedroom, a proper kitchen, and a living area.

One important distinction: under the Deemed-to-Satisfy pathway, the maximum remains 60sqm. The 70sqm limit only applies when you go through the performance-assessed approval route.

Rental to anyone — family restriction removed

The SA Parliament passed legislation ensuring all existing and new ancillary accommodation can be rented to anyone. Previously, development approvals often restricted occupation to family members of the main dwelling’s residents.

What the amended regulations mean in practice:

• It is no longer an offence to rent a granny flat to a non-family member
• Tenants in granny flats now have the same rights as tenants in other housing
• Existing granny flats with family-only conditions can also be rented out

This reform alone is expected to bring hundreds of additional dwellings onto the SA rental market.

SA granny flat size and design requirements

Deemed-to-Satisfy (DTS) requirements

The DTS pathway is the faster approval route. To qualify, your granny flat must meet all of the following:

Performance-assessed requirements

If your property or design doesn’t meet all DTS criteria, you go through the performance-assessed approval pathway. This allows greater flexibility: floor area up to 70sqm, properties under 600sqm assessed on merit, more flexible setback arrangements, and a council planner assessment rather than a tick-box check.

The performance-assessed pathway takes longer and gets more scrutiny, but it accommodates sites that don’t fit neatly into the DTS box.

Setback requirements in detail

SA’s setback rules vary depending on the zone and which approval pathway you’re following.

Urban zones

For most suburban Adelaide properties in residential zones:

• Front boundary: The granny flat must sit at least 500mm behind the front building line of the main dwelling. In practice, most granny flats are built in the rear yard.
• Side boundaries: Standard residential setback rules apply as specified by the zone’s Technical and Numeric Variations (TNVs). These vary by suburb — check your specific address on the PlanSA SAPPA map.
• Rear boundary: Subject to zone-specific TNVs. Typically 3–5 metres depending on the zone.
• Distance from main dwelling: No minimum in most urban zones, but practical access and fire separation requirements apply.

Rural zones

For properties in Rural, Productive Rural Landscape, or Rural Horticulture zones, ancillary accommodation must be set back no more than 20 metres from the primary dwelling. This prevents land fragmentation and keeps productive agricultural land intact.

Adelaide-specific council considerations

The Planning and Design Code applies state-wide, but certain Adelaide councils have local nuances worth knowing.

Inner Adelaide councils

Properties in the City of Adelaide, Unley, Norwood Payneham & St Peters, and Burnside often have heritage overlays and character area provisions. These can impose additional design requirements around materials, colour palette, roof form and pitch, and visibility from the street.

Outer Adelaide councils

Councils like Salisbury, Playford, and Onkaparinga generally have fewer overlay restrictions, making approvals more straightforward. Some areas may still have bushfire overlays requiring a BAL assessment, flood hazard overlays, or minimum site area variations specific to the subzone.

How to check your property

The most reliable way to understand what applies to your specific property is to look it up on PlanSA’s SAPPA interactive zoning map at code.plan.sa.gov.au. Enter your address to see your zone, overlays, and all applicable TNVs including setbacks, height limits, and site coverage.

Approval process: step by step

Every SA granny flat requires development approval. There is no exempt category. Here is how the process typically works.

Step 1: Check your zoning and overlays

Visit the PlanSA portal and enter your address. Identify your zone, subzone, and any overlays (heritage, flood, bushfire, character area). This determines which approval pathway applies and what design constraints you’re working with.

Step 2: Engage a designer or building professional

Have your granny flat designed to comply with either the DTS or performance-assessed requirements. A building designer or architect familiar with the Planning and Design Code is worth using here.

Step 3: Lodge a development application

Submit your development application through the PlanSA online portal. Your application will need a site plan showing the granny flat location, setbacks, and landscaping; floor plans and elevations; an energy efficiency assessment; and any specialist reports required by overlays (for example, a BAL assessment for bushfire areas).

Step 4: Assessment and approval

If your application meets all DTS criteria, assessment is relatively quick and doesn’t require public notification. The performance-assessed pathway may require neighbour notification, longer assessment timeframes, and planner discretion.

Step 5: Building approval

Separate from planning consent, you need building approval — from council or a private building certifier — to confirm compliance with the National Construction Code.

Step 6: Final inspection and occupancy

Once construction is complete, a final inspection is required before the granny flat can be occupied.

Connection requirements

SA granny flats must share all utility connections with the main dwelling. You cannot establish separate accounts or metered connections for electricity, water, gas (if applicable), sewer, or telecommunications.

In practice, the granny flat’s utilities are sub-metered from the main dwelling, or costs are bundled into the rent. This is one of the key differences between ancillary accommodation and a fully independent secondary dwelling, which SA does not currently permit on most residential lots.

What cannot be built as ancillary accommodation

Not everything qualifies. The following are not classified as ancillary accommodation and require separate (and often more complex) approvals: tiny homes on wheels, caravans used as permanent dwellings, shipping containers, structures exceeding 70sqm, three-bedroom dwellings (maximum is 2 bedrooms), and dwellings with separate utility connections.

Cost considerations for SA granny flats

Understanding SA’s specific rules helps you budget more accurately:

• Council application fees: Typically $500–$2,000 depending on the pathway
• Professional design fees: $3,000–$8,000 for plans meeting Code requirements
• Specialist reports: $500–$2,000 each (bushfire, heritage, stormwater as required)
• Utility connection work: $5,000–$15,000 for plumbing and electrical extensions from the main dwelling
• Construction cost: Typically $150,000–$250,000 for a quality 50–70sqm build in Adelaide

Use the grannyflatcost.com calculator to get a detailed estimate tailored to your SA property, including site preparation, council fees, connections, and construction costs specific to Adelaide and regional SA.

Frequently asked questions

Can I subdivide and sell my granny flat separately?

No. Ancillary accommodation must remain on the same title as the primary dwelling. It cannot be strata-titled or sold independently.

Do I need a separate address for the granny flat?

Yes. Contact your council to arrange a secondary address (for example, “Unit 2” or “Flat 1”) for postal and emergency services purposes.

Can I build a two-storey granny flat?

Under the DTS pathway, the maximum wall height is 3 metres, which effectively limits the build to single storey. Under performance assessment, slightly taller walls may be acceptable depending on the zone and impact on neighbours.

Is there a limit on how many granny flats I can build?

Yes — only one ancillary accommodation is permitted per allotment in addition to the primary dwelling.

Can I use the granny flat for short-term rental (Airbnb)?

The current regulations allow rental to anyone but don’t specifically address short-term accommodation platforms. Check with your council, as some areas have separate short-stay accommodation policies.

Next steps

1. Check your property on the PlanSA SAPPA map at code.plan.sa.gov.au
2. Estimate your costs using the grannyflatcost.com calculator
3. Engage a building designer experienced with SA’s Planning and Design Code
4. Lodge your development application through the PlanSA portal

South Australia’s reformed granny flat rules give homeowners a genuine opportunity to add value to their property, generate rental income, or house family members in a self-contained dwelling — all within a clearer, more supportive regulatory framework than existed even a few years ago.