How to split a single title for a duplex development in Adelaide

Not every duplex site can be legally divided. Council rules on minimum lot size, minimum frontage, minimum access width and site coverage must all be met independently for each new parcel.

Confirm feasibility at pre-lodgement stage with the council duty planner. Bring your site survey, your proposed division line, and a rough sketch of the two proposed dwellings. The duty planner will comment on whether the division is likely to be approved.

Some sites can support division but only with specific configurations. For example a battle-axe division (front dwelling and rear dwelling with driveway access to the rear) may be the only path where the block cannot support two side-by-side dwellings.

For sites where full land division is not possible, community title is the fallback path (see the sibling guide on Torrens vs community title).

The land division process requires a licensed surveyor registered in South Australia. The surveyor prepares the Plan of Division showing the proposed new boundaries, and lodges the plan with the Lands Titles Office.

The surveyor should be involved at concept design stage, not at the end of construction. Their input on boundary positions, easement placement, and how the division interacts with the dwelling designs can save significant redesign later.

Surveyor fees for a duplex land division typically range from a few thousand dollars, higher for complex sites with easements or unusual geometry.

Ask for referrals from your builder or designer. Adelaide has an established network of licensed surveyors experienced with duplex divisions.

The land division requires planning consent from your council, lodged via the PlanSA portal. This is separate from the planning consent for the buildings themselves, although they can be lodged together.

The application typically includes: the surveyor Plan of Division; a statement of how the division complies with the zoning rules; any required easements (drainage, access, services); and payment of council fees.

The council duty planner assesses the application. Straightforward divisions in supportive zones can be approved within 4 to 8 weeks. Divisions requiring public notification (typically for zones with tighter minimum lot sizes) can take 12 to 20 weeks.

Divisions that fail council assessment can be appealed to the Environment, Resources and Development Court, but appeals are expensive and slow. Most failures are avoided by careful pre-lodgement work.

Once council land division consent is granted, the surveyor lodges the Plan of Division with the Lands Titles Office for formal registration. Registration typically involves paying LTO fees, providing supporting title documents, and clearance from the council.

LTO registration typically takes 4 to 8 weeks after lodgement. Once registered, the original single title is cancelled and two new independent titles are issued.

The new titles carry any easements, restrictive covenants and rights-of-way as identified in the division plan. These must be checked carefully; unnoticed easements can affect future development on either side.

A property solicitor is worth engaging for the LTO registration phase. Fees are modest and the risk of errors at this stage (which can be difficult to correct later) makes professional input valuable.

The timing of the land division relative to construction matters for financing and sales.

Option one: complete the division before construction starts. This allows each dwelling to be built and sold under its own independent title from the outset. Financing is simpler with two separate loans.

Option two: complete the division alongside construction. The council land division consent can be obtained early, and the LTO registration completed as construction progresses. This allows some overlap of activities and can shorten the total project timeline.

Option three: complete the division after construction. Both dwellings are built under the original single title, and the division is completed at handover stage. This is administratively simpler during construction but delays the ability to sell either dwelling independently.

For a duplex intended for immediate sale of both dwellings, option one or two is usually preferable. For a duplex being held for rental, option three works fine and can save professional fees.