Australia largely retains a "buyer beware" approach to land transactions. With limited exceptions, sellers are not legally required to volunteer everything they know about a piece of land. Two states are exceptions worth knowing about. Victoria's Section 32 Vendor Statement is mandatory and must disclose title, encumbrances, planning zone and overlays, outgoings, services, building permits in the last seven years, and statutory notices — and a material deficiency can give the buyer a right to rescind. Queensland's seller disclosure regime under Part 3 of the Property Law Act 2023 (commenced 1 August 2025) introduced a similar mandatory disclosure statement. In all other states, the buyer must commission searches themselves — and even in Victoria and Queensland, smart buyers verify rather than rely.

Due diligence is the deliberate process of asking every question that could affect price, buildability or risk before you exchange contracts, or — where allowed — during the cooling-off period (typically 3–5 business days, depending on the state). At auction, there is no cooling off, so every search must be done before the auction.

A robust due diligence pack for vacant land usually covers these items:

  • A title search, plus copies of every underlying instrument referenced on it (mortgages, easements, 88B, restriction documents).
  • A copy of the registered plan (covered in Post 3).
  • An identification survey (optional but strongly advised if fences and pegs seem ambiguous), and a feature and level survey if you're moving toward design.
  • A planning certificate — Section 10.7(2) in NSW, Section 32 in VIC, Form 24 / planning property search in QLD, Section 7 statement in SA, and equivalents in WA, TAS, ACT and NT. These reveal zoning, overlays, contamination notations, and heritage controls.
  • Rates and outgoings certificates showing any arrears.
  • Sewer and water service diagrams from the relevant authority (see Post 5).
  • A build-over feasibility check if you're considering a knockdown-rebuild or a tight lot.
  • For new lots: the Section 73 Compliance Certificate (NSW) or equivalent confirming services are committed.
  • A flood certificate or council flood study; a bushfire BAL assessment; an acid sulfate soils overlay check; and any council-issued planning notices.
  • A contamination history search through the relevant state EPA register, and an environmental Phase 1 desktop assessment if any historical use is suspect (orchards, service stations, dry cleaners, industrial uses).
  • Heritage searches through state heritage registers and Indigenous cultural heritage databases (such as AHIMS in NSW).
  • A native title or Indigenous Land Use Agreement search through the National Native Title Tribunal.
  • Transport-authority notices showing any acquisition proposals.
  • NBN availability and, in mining states, mining or petroleum tenement searches.
  • For knockdown-rebuilds: building information certificate (NSW), building permit history, asbestos and pest inspections, demolition cost estimates, and confirmation that the existing dwelling is "lawful" — built with the proper permits.

That looks like a lot. For a standard suburban vacant lot, the total search bill typically runs $2,500–$5,000 (much of it driven by conveyancing fees and disbursements). For a complex infill, rural-residential or contamination-suspected lot, it can climb to $10,000–$40,000 — but a $5,000 search pack frequently reveals issues worth $30,000–$200,000 in remediation, redesign, or a clean exit.

Questions worth asking the seller (in addition to the document requests above):

  • What is the planning zone and every overlay applying to the lot?
  • Has the lot or any neighbouring lot ever been notified as contaminated?
  • Have you received any notice, order or proposed acquisition from any authority in the last five years?
  • Are services connected to the lot boundary?
  • Is the lot subject to any current or proposed compulsory acquisition?
  • Have any prior development applications on this lot been refused, and why?
  • For knockdown-rebuilds: was the existing house built with permits, and is there an asbestos register?

Who can help. A licensed conveyancer or property solicitor coordinates most searches. A specialist contamination consultant — typically a member of EIANZ or a holder of the CEnvP credential — handles Phase 1 environmental assessments ($2,000–$5,000) and Phase 2 sampling if needed. A bushfire consultant (BPAD-accredited through Fire Protection Association Australia) handles BAL assessments. A heritage consultant handles cultural heritage and historic listings. Themes 7–14 of this series unpack each of these specialists in detail.

The strongest negotiating leverage you'll ever have is a documented finding from your own due diligence. Sellers will more often discount than re-list. The point of every question in this series is not to be obstructive — it is to make sure that what you think you're buying and what's actually for sale are the same thing.

This article is general information only — a starting point for your own questions, not legal, financial, planning, environmental or engineering advice. Disclosure obligations, certificates, search processes and fees vary by state, territory and council and are subject to change. Always engage suitably qualified professionals — a licensed conveyancer or solicitor, specialist consultants for environmental, planning, heritage and engineering matters, and an accredited certifier — and use the seller of any block of land as a primary source for documents, history and prior approvals. Independent advice should be obtained before making any property decision.

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