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Tiny home rules in South Australia
| Governing Act | Planning, Development and Infrastructure Act 2016[1] |
|---|---|
| Ancillary accommodation | max 2 bedrooms, secondary to a dwelling on the same allotment[1] |
| Self-contained? | Permitted under the current definition[1] |
| Who may occupy | No restrictions; conditions preventing letting are prohibited[1] |
| THOW occupation | Requires development approval unless used as ancillary accommodation with no building work[1] |
| Building class required | NCC Class 1a, or Class 1b for short-term accommodation[1] |
| Penalty for unapproved development | up to A$120,000[1] |
| *Fire or flood displacement allows temporary accommodation for up to 2 years.[1] | |
In South Australia a tiny home can be approved as ancillary accommodation: secondary to a dwelling on the same allotment, with no more than two bedrooms and no restriction on who may live in it.[1] A tiny house on wheels needs development approval unless it is used as ancillary accommodation with no building work, and unapproved development can attract a penalty of up to A$120,000.[1]
South Australia is unusual in having published detailed official guidance specifically on tiny homes, caravans and moveable housing. PlanSA's own frequently asked questions document sets out how the state distinguishes between a granny flat, a caravan and a tiny house on wheels — and the distinctions turn on things most buyers never think to ask about, such as whether the unit is bolted to piers and whether a deck is attached.[1]
The single most useful thing to understand is that South Australia asks two separate questions: is this development requiring planning approval, and is this building work requiring building approval. A tiny home can trigger one, both or neither depending on how it is installed.
Ancillary accommodation — the fixed pathway §
Ancillary accommodation is South Australia's term for what other states call a granny flat or secondary dwelling. Under the current definition it is accommodation that sits on the same site as an existing dwelling and is ancillary to it, may but need not be self-contained, and contains no more than two bedrooms or rooms capable of being used as a bedroom.[1]
Two consequences follow immediately:
- It cannot stand alone. Ancillary accommodation is always secondary to a dwelling on the same allotment. On a vacant allotment the structure cannot be ancillary accommodation — it will most likely be defined as a dwelling.[1]
- Self-contained is now allowed. Under the previous definition ancillary accommodation was not permitted to be self-contained; under the current one it may be.[1]
Construction requires development approval under the Planning, Development and Infrastructure Act 2016, which means both planning approval and building approval. Planning approval addresses siting and impact on neighbours; building approval is required because ancillary accommodation is a Class 1a habitable structure under the National Construction Code, so minimum fire and structural provisions apply and occupants must be connected to wastewater, water and electricity.[1][2]
Who can live in it §
There are no limitations or restrictions on who may occupy ancillary accommodation in South Australia. State Planning Commission Practice Direction 12 (Conditions) 2020 prohibits conditions being placed on approvals that would prevent it from being leased, rented or occupied — and the government has legislated that failing to comply with an existing condition of that kind is no longer an offence.[1]
That is a materially more open position than several other states, where secondary dwellings have historically been restricted to family members. See can you rent out a granny flat.
Caravans on residential land §
Parking a caravan on land used for residential purposes, by a person who occupies a dwelling on that land, does not require development approval — provided the caravan is parked on the land and not fixed to it. Occupying that parked caravan will not usually require development approval either, on the basis that the occupation is ancillary to the dwelling.[1]
Two situations fall outside that: occupying a caravan on vacant or unused land, and any caravan permanently fixed to the land. Both require development approval.[1]
Councils also retain a power under section 254 of the Local Government Act 1999 to order a person to stop using a caravan as a place of habitation where it presents a risk to the occupant's health or safety, threatens damage to the environment, or significantly detracts from the amenity of the locality.[1]
Tiny houses on wheels are treated differently from caravans §
PlanSA draws an explicit distinction. Caravans are more readily moveable and intended for short-term accommodation; tiny houses on wheels appear to be promoted as permanent or semi-permanent residential accommodation.[1]
The rule that follows is narrow. Occupation of a tiny house on wheels requires development approval unless it is being used as ancillary accommodation and does not involve building work.[1]
Both halves of that sentence have to be satisfied. And "building work" is triggered more easily than most buyers expect.
What triggers "building work" §
Published guidance identifies three triggers:[1]
- A level of permanency or connection to the ground — mounting on stumps, piers or footings.
- Pipework such as drains or water lines connecting the unit to services on the site.
- Permanent or semi-permanent structures attached to it — a deck, pergola or verandah.
In practice that means the ordinary things people do to make a tiny home comfortable are the same things that convert it from a vehicle into a building. Hard-plumbing the waste line is the most common trigger.
There is also a point that catches owners planning to move around: each time a tiny house on wheels or other moveable housing is placed or relocated on land, it will usually require development approval.[1]
The Class 1a problem §
Where a tiny house on wheels does involve building work, it requires Building Consent and must achieve a Building Class 1a classification under the NCC — or Class 1b if used as short-term accommodation.[1]
PlanSA states the consumer risk directly: many tiny home products offered in the market do not comply with Class 1 occupancy requirements under the NCC, and where the minimum NCC requirements are not met, the buyer may have difficulty obtaining Building Consent.[1]
This is the question to put to any South Australian supplier in writing before paying a deposit: can this unit achieve an NCC Class 1a classification, and will you provide the documentation a building certifier requires? Drawn from PlanSA's stated consumer concern[1]
After a fire or flood §
Where a dwelling or part of a dwelling has been damaged by flood or fire, a caravan or other temporary structure may be used as accommodation by the landowner for a period not exceeding two years, or until a new dwelling can be occupied under the PDI Act — whichever comes first.[1]
The penalty §
The maximum penalty for undertaking development without approval, or contrary to an approval that has been issued, is A$120,000. Anyone who has already undertaken development requiring approval without obtaining it is directed to contact the relevant council as soon as possible.[1]
Road limits §
A tiny house on wheels only functions as moveable housing if it can legally travel. Published guidance puts standard road limits at about 4.3 m in height, 2.5 m in width and roughly 9 m in length for travel without special permits.[3]
Summary §
| Scenario | Development approval? |
|---|---|
| Caravan parked (not fixed) on land with a dwelling, occupied by a resident of that dwelling | Not usually required[1] |
| Caravan occupied on vacant or unused land | Required[1] |
| Caravan permanently fixed to the land | Required[1] |
| THOW used as ancillary accommodation, no building work | Not required[1] |
| THOW involving any building work trigger | Required — planning and building[1] |
| THOW as the only structure on vacant land | Required — treated as a dwelling[1] |
| Fixed ancillary accommodation (granny flat, modular, demountable) | Required — planning and building[1] |
Related guides §
- Granny flat rules in South Australia
- Can you live in a tiny house full time in Australia?
- On wheels or fixed foundation — which should you choose?
- Glossary
Sent to info@modularlivingaustralia.com.au and handled by a person. See Privacy.
References §
- PlanSA (Government of South Australia) — Ancillary accommodation, caravans and moveable housing FAQ — Ancillary accommodation is located on the same site as an existing dwelling and is ancillary to it, may but need not be self-contained, and contains no more than two bedrooms or rooms capable of being used as a bedroom; it is always secondary to the dwelling on the same allotment and cannot be defined as ancillary accommodation on a vacant allotment. Construction requires development approval under the Planning, Development and Infrastructure Act 2016, comprising planning and building approval, because it is a Class 1a habitable structure under the NCC. There are no restrictions on who may occupy it, and State Planning Commission Practice Direction 12 (Conditions) 2020 prohibits conditions preventing it from being leased, rented or occupied. Parking a caravan on residential land by an occupant of a dwelling on that land does not require development approval provided it is parked and not fixed; occupying a caravan on vacant or unused land, or where it is permanently fixed, does require approval. Occupation of a tiny house on wheels requires development approval unless used as ancillary accommodation without building work. Building work is typically triggered by permanency or connection to the ground such as stumps, piers or footings; by pipework connecting to services; or by attached decks, pergolas or verandahs. Each time a tiny house on wheels is placed or relocated it will usually require development approval. Tiny houses on wheels must achieve NCC Class 1a, or Class 1b for short-term accommodation, and many products on the market do not comply with Class 1 occupancy requirements. Where a dwelling is damaged by flood or fire, a caravan or other temporary structure may be used for up to two years or until a new dwelling can be occupied, whichever comes first. The maximum penalty for undertaking development without approval is A$120,000. Councils have powers under section 254 of the Local Government Act 1999 to order a person to stop using a caravan as a place of habitation where it risks occupant health or safety, threatens damage to the environment, or significantly detracts from local amenity. plan.sa.gov.au/__data/assets/pdf_file/0018/1344132/Ancillary-accommodation-caravans-and-moveable-housing-FAQ.pdf
- PlanSA (Government of South Australia) — news, April 2024 — Recent changes are making it easier to build smaller, secondary accommodation, but planning and building approval are still required to ensure occupants have a safe place to live, taking account of proximity to neighbours. plan.sa.gov.au/news/article/2024/unpacking-rules-for-ancillary-accommodation
- Wright Choice Homes — Wheeled dwellings must respect road limits of about 4.3 m height, 2.5 m width and roughly 9 m length to travel without special permits; Australian tiny homes typically 15–55 m². wrightchoicehomes.com.au/blog/how-much-do-modular-homes-cost/
Figures are as published by the sources above at their respective dates and are paraphrased summaries, not verbatim reproductions. Verify current pricing and rules directly with builders, lenders and planning authorities.