New Zealand properties are sold three main ways: private treaty (a standard listed price or negotiation), deadline sale (offers by a set date), and auction. Each one changes how and when you can attach conditions to your offer, which changes how you should prepare.

Private treaty

This is the most familiar process: the property is listed, usually with a price or price range, and you negotiate directly with the vendor through their agent. You can make a conditional offer at any point — finance, building report and LIM conditions are all standard here, and there's often room to negotiate the length of your due diligence period if you need more time.

Deadline sale

The property is marketed without a set price, and buyers are asked to submit offers by a published deadline. You can still make your offer conditional, but you're doing it blind to what other buyers are offering, and the vendor isn't obliged to accept any offer or to negotiate after the deadline — they might accept early, go back to multiple parties, or pass on all offers. Because you don't know what you're up against, it's worth having your finance pre-approval and your thinking on conditions sorted before the deadline, not during a rushed final negotiation.

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Auction

This is the one that changes things most. Once the hammer falls, the sale is unconditional — there is no finance condition, no building report condition, no LIM condition negotiated after the fact. Everything you'd normally check during due diligence has to happen before auction day:

  • Unconditional finance approval, or written confirmation your lender will fund it
  • A building inspection completed and reviewed
  • The LIM ordered, received and read
  • Insurance confirmed as available for the property
  • Your lawyer's review of the title and auction contract terms done in advance

Some vendors will agree to a pre-auction offer with conditions attached, which the vendor can choose to accept, decline, or use to bring the auction forward — but there's no guarantee that option is available, and it's entirely the vendor's choice.

What this means for your due diligence timing

For a private treaty or deadline sale, your due diligence period starts after your offer is in. For an auction, it has to happen before — which means if you're seriously considering a property going to auction, you're ordering the LIM and booking the building inspection well before auction day, on a property you might not end up buying. That's a real cost, which is one reason some buyers focus their auction interest on properties they're genuinely committed to rather than spreading it across everything on their list.

Working out which properties are going which way

When you're watching several listings at once, it's easy to lose track of which ones are headed to auction and need everything done up front, and which ones give you more room to negotiate conditions after an offer. Recording the sale method and any key dates against each property as you add it to your watchlist means that distinction is sitting right there when you're deciding what to act on next, rather than something you have to recall from memory.