Date: 1st Apr 2026
Buying or selling a property is one of the biggest financial decisions most New Zealanders will ever make, and with that decision comes a lot of paperwork! At the centre of the process is one especially critical contractual document: the sale and purchase agreement.
This agreement is a legally binding contract that carries significant rights, obligations, and risks for both buyers and sellers, so understanding exactly what you’re agreeing to before you sign is crucial. Once the agreement becomes unconditional, walking away can be costly or even impossible without legal consequences.
Purchasing your first home, selling an investment property, or navigating a competitive market? Knowing how a sale and purchase agreement works puts you in control and helps you avoid expensive mistakes and headaches.
Under New Zealand property law, a sale and purchase agreement is a legally binding contract that sets out the terms on which a property will be sold and bought. For example, the date by which a buyer must pay the balance, or the date by which the seller must provide a satisfactory building report.
A real estate purchase agreement records the rights and obligations of both parties and, once certain requirements are met, is enforceable by law. A sale is not legally enforceable until both the buyer and seller have signed a sale and purchase agreement.
In residential property transactions, the most commonly used agreement is the standard.
The process is typically as follows:
A sale and purchase agreement may be conditional or unconditional. Conditional vs unconditional agreements:
Signing without conditions significantly increases risk, especially for buyers who may still need finance approval or further checks.
This process differs from an auction. Read our guide on how to buy a house at auction.
The purchase price is clearly recorded in the agreement and represents the amount the buyer agrees to pay for the property. In New Zealand, the agreement also specifies when the buyer must pay the deposit and who it is paid to (usually the real estate agency’s trust account).
The deposit is typically refunded if a valid condition is not satisfied. However, this depends on what the sale and purchase agreement says. The buyer may pay the deposit when they sign the agreement, when the agreement becomes unconditional, or within a set number of working days.
If the buyer fails to meet the terms of the agreement after it is unconditional, the seller may be entitled to retain the deposit.
You’ll find two key dates in the sale and purchase agreement: the settlement date and the possession date.
The settlement date is the day the purchase price balance is paid and ownership of the property legally transfers from the seller to the buyer. This is typically handled by the buyer and seller’s lawyers and will be outlined clearly in the agreement.
The possession date is the date the buyer can physically take possession of the property. Often, possession and settlement occur on the same day, but this is not always the case and should be clearly recorded in the agreement to avoid confusion.
Chattels are items included in the sale of the property but not permanently fixed to it. Clearly listing chattels in the agreement helps prevent disputes later on.
Common examples include kitchen appliances, heat pumps, curtains, blinds, and garden sheds. Anything not listed may be removed by the seller, so accuracy here is essential for buyers.
Buyers are required to pay the deposit and the balance of the purchase price by the agreed-upon dates. They must also meet any conditions in the agreement, including obtaining finance or completing due diligence.
Buyers are also responsible for arranging inspections, reviewing reports, and ensuring all conditions are satisfied within the specified timeframes. Failure to do so can result in the agreement becoming unconditional or lapsing, depending on the terms.
On settlement day, buyers must ensure funds are available and transferred on time.
Read our guide on ways to buy a property.
Sellers must work with their solicitors to provide a clear title to the property, transfer the property to the buyer as the new legal owner, and comply with all disclosure requirements. This includes ensuring there are no hidden issues that could affect the buyer’s decision.
They are also required to vacate the property as agreed and deliver all listed chattels in the condition specified in the agreement. Any failure to meet these obligations can constitute a breach, with consequences such as the buyer withholding funds, seeking compensation, or even taking legal action.
Read our guide on ways to sell a property.
A finance condition gives the buyer time to obtain formal lender approval. This protects buyers from being locked into a purchase they cannot afford, and wasting the seller’s time.
The agreement will specify how long the buyer has to confirm finance, along with any supporting evidence that may be required. Missing deadlines can have serious ramifications, so staying on top of financial responsibilities is a must.
Building inspections help identify structural or maintenance issues that may not be obvious during viewings. A LIM (Land Information Memorandum) report provides information from the local council, including consents, zoning, and potential hazards.
These conditions protect buyers by allowing them to walk away or renegotiate if major issues are uncovered.
Generally speaking, conditions precedent are requirements that must be satisfied before the agreement becomes unconditional. While finance conditions, building inspections, and LIM reports are among the most common, buyers and sellers can include custom conditions in a sale and purchase agreement. Some examples may include toxicology reports, solicitor approval, and the sale of another property.
All the conditions must be met before the agreed deadline. If they aren't, buyers may lose protection, or sellers may gain the right to cancel. Precision, guidance from real estate agents, and legal advice are highly recommended to ensure a smooth transaction.
A breach occurs when the buyer or the seller fails to meet their obligations under the agreement. There are many ways that either party could breach the property purchase agreement. This includes a buyer failing to fulfil payment on settlement day, or a seller removing items included in the sale.
There is no one-size-fits-all consequence; the severity depends on the nature of the breach. Typically, it includes financial penalties, loss of deposit, compensation claims, or legal action. Acting quickly, alongside a real estate agent and a lawyer, is essential to prevent a breach or to address one that is likely to occur.
Although standard agreements like those produced by REINZ are widely used, they are not simple documents, and certainly not just a formality. Relying on verbal assurances or assumptions instead of those in writing can expose you to unnecessary risk.
A property lawyer can explain your obligations, amend or add conditions, and ensure your interests are protected before you sign. Most importantly, they can identify risks that may not be obvious, even to the most seasoned sellers and buyers.
Important: Never feel pressured to sign an agreement without fully understanding it. Taking the time to seek legal advice is always worth it and can potentially save significant stress and money later.
In most residential property transactions in New Zealand, the sale and purchase agreement is prepared by the real estate agent using the standard REINZ agreement. The agent fills in key details, such as the purchase price, settlement date, conditions, and chattels, based on discussions with the buyer and seller.
While a qualified agent prepares the document, it’s important to understand that this is not considered legal advice. Both buyers and sellers should have a lawyer closely review the agreement before signing.
There is no separate fee for preparing the sale and purchase agreement. The deposit is a part-payment of the purchase price, not a cost or charge, and is credited toward the final settlement amount.
Each party pays their own legal fees for advice, reviewing the agreement, and handling the settlement.
An agreement is valid once both parties sign it. If the agreement includes conditions, it remains conditional until those conditions are met or their deadlines expire (negotiable). If all conditions are satisfied or waived, the agreement becomes unconditional and doesn’t expire; it remains in force until settlement is completed on the agreed-upon date.
Most purchase agreements for houses also include an offer expiry date and time, which sets how long the seller has to accept the buyer’s offer. If the seller does not accept the offer by that deadline, the offer lapses and becomes invalid.
Usually not. Because they are a legally binding contract, you cannot simply cancel an agreement in the event of a better offer or a change of heart. Cancellation is only possible if specific terms and conditions aren’t met within the agreed-upon timeframe, like failure to arrange payment during settlement. If both parties agree to cancel, it can be done, but it may result in penalties and the loss of the deposit.
No, purchase and sale agreements are private legal contracts between the buyer and the seller. Only the parties involved, their lawyers, real estate agents and other relevant professionals have access to the agreement.
Some information about a property sale may later become public, such as the sale price, but the agreement itself, including its terms, conditions, and clauses, remains confidential.
Buyers usually sign the agreement when making an offer on a property, and the seller signs once they accept that offer.
Key things to check include the purchase price of the house, the deposit amount, the settlement and possession dates, and any conditions included in the agreement. You should also carefully review the list of chattels, timeframes for meeting conditions, and any special terms or clauses. If anything is unclear or missing, get it clarified or amended before signing.
When you work with a real estate company, the agent manages the negotiation process between the buyer and seller. They present offers, explain terms, and communicate counter-offers, helping everyone understand how price, conditions, and timing shape the deal. The most commonly negotiated items include the purchase price, deposit, settlement date, chattels, and conditions such as finance or inspections.
All agreed changes must be written into the agreement. While the agent facilitates negotiation, buyers and sellers should still seek legal advice before signing to ensure their interests are protected.
Read our guide on whether selling with an agency or privately is right for you.
Think of the sale and purchase agreement as the foundation of your property transaction. Without a contract that you know inside and out, and that represents your best interests and capabilities, you’re setting yourself up for potentially costly errors and time-consuming processes down the road.
Take the time to understand the unique terms, ask questions, and seek professional advice. It’ll put you in the strongest possible position, whether you’re buying or selling!
If you’re preparing to enter the market or reviewing an agreement, speak with a Tremains Consultant and a qualified legal professional to ensure you move forward with clarity and confidence.
Rateable value vs market value: What’s the difference?
What are you sitting on? It might be more than you think.
House not selling? Here’s what to do next
What to do when selling a tenanted rental property