Buying guide

Understanding a Sale & Purchase Agreement in NZ

You can’t buy or sell a house in NZ without both parties signing a sale and purchase agreement.

Hannah Hilliam
Last updated: 28 May 2026 | 2 min read
AI

AI summary

A Sale & Purchase Agreement is the legally binding contract for any NZ property transaction. It outlines all terms, including the price, deposit, chattels, and key dates for settlement. It is crucial to get legal advice before signing.

An agreement can be conditional, allowing time for finance or building reports. Once all conditions are met, it becomes unconditional, legally committing both parties to the sale.

Failing to meet your obligations can have serious financial consequences.

You can’t buy or sell a house in New Zealand without both parties signing a Sale and Purchase Agreement. This legally binding contract is the absolute foundation of your property journey, locking in the terms, conditions, and timeline for the entire transaction.

Because it’s a legal contract, it is crucial for both buyers and sellers to get professional legal advice before putting pen to paper.

Here is everything you need to know about what goes into the agreement, how conditions work, and how to protect yourself during the process.

What is a sale and purchase agreement?

A Sale and Purchase Agreement is the binding contract between the person buying the house and the person selling it.

These documents exist for two main reasons: to establish the exact terms and conditions of the sale, and to lay out a clear timeline of what will happen throughout the process.

Once both parties sign the document, you have officially entered into a legal transaction. This means you cannot back out simply because you changed your mind, making it one of the most important pieces of paperwork you will ever sign.

Before you sign a sale and purchase agreement, make sure you have all these things checked.

What does a sale and purchase agreement include?

Usually, the seller’s lawyer, conveyancer, or real estate agent will draw up the initial agreement to capture the specific details of the transaction. From there, your own legal representative will review the document with you to ensure you are entirely happy with the setup before you sign.

Standard information you will find on most New Zealand agreements includes:

  • The names of both parties: The legal names of the buyers and sellers.
  • The property details: The physical address and the legal title type (such as freehold, cross lease or leasehold).
  • The purchase price: The exact amount the buyer is offering for the property.
  • The deposit: The amount the buyer needs to pay. Depending on what the contract states, this is either paid immediately upon signing or the moment the offer goes unconditional (usually 10% of the purchase price).
  • Chattels: A clear list of items included in the sale that are not part of the physical structure (such as blinds, heat pumps, or specific light fittings).
  • Conditional clauses: Any specific requirements that must be satisfied (such as securing a building report) and the exact timeframe allowed to meet them.
  • The unconditional date: The deadline by which all agreed conditions must be cleared.
  • The settlement date: The long-awaited day when the final money changes hands, ownership officially transfers, and the keys are handed over.

 

Unsure about what happens when the keys change hands? Take a look at our breakdown of what happens on settlement day so you know exactly what to expect.

Both buyers and sellers can add conditions to a sale and purchase agreement.

Conditional vs. unconditional agreements

An agreement can either be 'conditional' or 'unconditional'.

A conditional agreement means the sale only goes ahead if certain criteria are met within a set timeframe. Both the buyer and seller can negotiate and add conditions before the contract is finalised.

Common buyer conditions include:

  • Finance: Giving the buyer time to get unconditional mortgage approval from their lender.
  • Building report: Ensuring the structure is sound and free of hidden defects.
  • LIM (Land Information Memorandum): A comprehensive report from the local council checking zoning, rates, and building permits.

 

Sellers can also add their own conditions, such as making the sale dependent on them successfully buying their next home or renting the property back from the new owner for a fixed period.

Once every single condition has been satisfied and confirmed in writing by the respective lawyers, the agreement becomes unconditional. At this point, the deal is locked in and both parties are legally committed to completing the sale on settlement day.

Checking your pre-settlement obligations

Before you reach that final settlement day, there is one last critical hurdle: the pre-settlement inspection. The Sale and Purchase Agreement gives the buyer the right to inspect the property before the money changes hands to ensure everything is in the same condition as when they signed.

To ensure you know what to look for, from checking that the oven works to making sure no new damage has occurred, read our comprehensive guide on how to nail your pre-settlement inspection before your inspection date rolls around.

What if you can’t meet the conditions?

The Sale and Purchase Agreement explicitly outlines what happens if either side cannot meet the finalised conditions by the due date.

If a condition cannot be met, for example, if the bank declines the buyer's finance or a building report uncovers major structural issues, the agreement can usually be cancelled, and the deposit returned to the buyer.

However, if you simply default on an unconditional agreement or miss a deadline without a valid legal reason, you can face severe financial penalties. This can include losing your deposit or paying compensation to the other party for delays. If you think a deadline might be missed, the best thing to do is speak to your lawyer or conveyancer immediately to explore an extension.

*We hope this article has provided some helpful information. It's based on our experience and is not intended as a complete guide. Of course, it doesn’t consider your individual needs or situation. If you're thinking about buying or selling a property, you should always get specific advice.

Author

Hannah Hilliam Hannah Hilliam
Content Writer

Hannah is a staff writer at Trade Me, contributing to Trade Me Property. Having bought, sold, and renovated homes herself, she knows first-hand how exciting (and overwhelming) the property journey can be. With a knack for making complex topics feel simple, Hannah focuses on sharing practical, down-to-earth advice to make daunting decisions feel a little less overwhelming.