Land division in South Australia: who decides it, and how

The certificate is the thing

Section 138(1) of the Planning, Development and Infrastructure Act 2016 provides that, subject to prescribed exclusions, a development involving the division of land requires a certificate from the Commission that it is satisfied the prescribed conditions as to development have been satisfied.

The same subsection carries an alternative, and it is conditional: the certificate may instead rest on the applicant having, "by virtue of an entitlement under the regulations", entered a binding agreement supported by adequate security for the satisfaction of a condition. Regulation 87 is where that alternative is worked out, and regulation 89(1) adds that an approved model arrangement does not limit an applicant’s ability to enter any other form of arrangement to the satisfaction of the Commission and the relevant council. So the conditions do not all have to be physically complete before a certificate exists — but where they are not, something binding and secured has to stand in their place.

Two practical features sit in the rest of the section. Under subsection (5) the Commission may issue a certificate in relation to a particular stage of a staged division. Under subsection (6) a certificate lapses at the end of the prescribed period unless the Commission extends it within that period.

A decision cannot be made until a report arrives

Regulation 76(1) provides that where an application involves the division of land, the relevant authority must not make a decision until it has received a report from the Commission on the matters under section 102(1)(c) or (d), as relevant.

Regulation 76(2) then supplies what happens if the report does not come: where none is received within 20 business days from lodgement, or within such longer period as the Commission may require by notice, the relevant authority may presume the Commission does not desire to make a report.

That is a rule about when an authority may proceed, not a service commitment and not an indication of how long any particular application takes. The Commission may also consult other agencies and impose a 20 business day limit for their response under regulation 76(4).

Where a council actually holds discretion

The planning rules themselves are state-wide: the Planning and Design Code is a single instrument, so councils are not writing different rules from one another. Division engineering is the exception, and it is written as explicit discretion.

Regulation 81(1) sets the width of a proposed road within a division at not less than 12.4 m and not more than 35 m, and it opens "Subject to subregulations (2) and (4)". Subregulation (2) raises the floor rather than lowering it: subject to section 38 of the Roads (Opening and Closing) Act 1991, a proposed road likely to be used regularly or extensively by commercial vehicles must be not less than 20 m. Regulation 81(4) then allows the council to dispense with a prescribed width and specify a different one, if it is of the opinion that the prescribed width is not necessary for the safe and convenient movement of vehicles or pedestrians, or for underground services.

The same pattern runs through the cul-de-sac provisions: regulation 81(5) requires at least 25 m for a length of at least 25 m at the head, "or such other dimensions as may be acceptable to the council", and regulation 81(6) lets the council dispense with the requirement where the cul-de-sac is likely to become a through road.

Regulation 82 works the other way: where an existing road abuts land proposed to be divided and the council considers it should be widened having regard to existing and future requirements of the area, the division must provide for that widening — subject to caps written into subregulation (2), including that a building suitable for occupation standing on the land needed for widening changes what can be required.

Unfinished requirements do not automatically stop a certificate

Regulation 87(1) provides that the Commission may issue a section 138 certificate even though the requirements under Division 6 have not been fully satisfied, where the council advises that the applicant has entered a binding arrangement with the council for their satisfaction and that the arrangement is supported by adequate security.

Subregulation (1)(b) treats the electricity requirement under regulation 84(5) separately, with the binding arrangement made with the appropriate electricity authority. Subregulation (2) does the same for water supply and sewerage requirements, with the relevant responsible Minister.

The shape is consistent: the certificate can precede physical completion, but only where an obligation backed by security has replaced the completed work.

What this does and does not tell you about a block

Everything above is process: who certifies, what has to arrive before a decision, and where discretion sits. None of it says whether a particular piece of land can be divided.

That question is decided by the Planning and Design Code against the zone, subzone and overlays that apply to the property, and by practical constraints such as access, services and levels. Those have to be checked for the address.

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