Updated 25 October 2026
What Property Buyers Need to Know About the Contract for Sale #21: How do I handle variations in the contract?
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How to change a property sale contract
If you need to change a NSW property sale contract, ask your solicitor to review the proposal and arrange clear, enforceable terms before you act on it. Common changes include a revised settlement date, a price adjustment, different inclusions or work the seller agrees to complete.
A request is not an agreement. Continue working towards your existing obligations unless your lawyer confirms that a variation or another legal basis changes them. Informal assurances can leave you exposed to a missed deadline, disputed repairs or an unexpected payment.
Start with the contract and the stage of the purchase
Before exchange, proposed amendments usually form part of negotiating the contract you will sign. Check that every agreed amendment appears in the final version. After exchange of contracts, the parties are generally bound, subject to any applicable cooling-off, contractual or statutory rights.
Read the general conditions, special conditions and any earlier amendments together. Identify the clause you want changed and whether the contract prescribes how variations must be made or notices served.
A negotiated variation ordinarily requires agreement. That is different from a party exercising an existing contractual power, such as a permitted extension or an off-the-plan change. Your lawyer should check the scope of that power and any statutory restrictions before deciding whether fresh agreement is required.
Put the agreement in writing and check enforceability
Use a clearly drafted written variation signed by the parties or their appropriately authorised representatives. Depending on the circumstances, this may be an amendment agreement or a deed. Identify the original contract, property and parties, and state exactly which provisions change.
It is inaccurate to say that every NSW contract variation is invalid unless both parties sign it. For land transactions, section 54A of the Conveyancing Act 1919 generally requires the agreement, or a sufficient written record, to be signed by the party against whom enforcement is sought or their authorised representative. Its application to the proposed change needs legal assessment.
The legislation preserves part performance, a doctrine that can sometimes support enforcement of an unwritten land agreement. Oral assurances and conduct may also affect whether a party can insist on strict contractual rights. These issues are fact-sensitive and can be expensive to prove. Document the change instead of planning to establish an exception later.
Your solicitor should also check authority to agree, certainty of the terms and whether consideration supports the variation or a properly executed deed is needed. Consideration is the legally recognised exchange supporting a promise; it need not always be an additional cash payment.
Describe the practical change precisely
Replace vague promises with obligations that can be checked. If the seller agrees to repairs, identify the work, the completion date, required approvals or qualifications, and how satisfactory completion will be confirmed. Address what happens if the work is unfinished when settlement is due.
For inclusions, identify the particular item and whether it is supplied, removed or replaced. For a price reduction, record the revised price and its effect on the deposit, balance and adjustments.
State when the variation takes effect and which other terms continue. A variation should resolve the issue being negotiated without accidentally releasing an unrelated claim or removing a protection you still need.
Treat settlement extensions as a new commitment
An extension should specify the new completion date and any relevant time. Check whether default interest, legal costs or other charges continue, whether an existing notice to complete is withdrawn or amended, and what happens to rights arising from an earlier default.
Moving the date does not necessarily waive every consequence of delay. Conversely, agreeing to an extension can affect existing rights, so the drafting matters for both parties.
Confirm with your lender that funds and loan documents will be ready for the revised date. Ask your lawyer to explain any provision making time essential. Do not assume that negotiations suspend a deadline or that a variation automatically starts a fresh cooling-off period.
Check finance and duty before accepting a price change
Give your lender the proposed change so it can check whether the approval, valuation or loan documents need updating. A smaller purchase price does not necessarily leave the approved loan amount or your required contribution unchanged.
Revenue NSW’s guidance on variations explains that changes to the purchase price can require a duty assessment or reassessment. Duty is generally calculated on the higher of the varied consideration and market value. Your representative should also check any duty on the variation document.
Replacing a purchaser or changing ownership arrangements raises different issues from correcting a spelling error. Obtain advice about consent, contractual liability and duty before adding a partner, company or trustee. A new name on paperwork does not automatically release the original purchaser.
Emails and conversations can have legal consequences
An email exchange may help establish an agreement, and an electronic signature can satisfy signing requirements when the applicable conditions are met. That does not make every email chain a valid variation or every typed name sufficient.
Be clear whether you are making a proposal, accepting terms or waiting for a formal document. Send relevant messages to your solicitor before replying. An agent’s reassurance that a change should be acceptable is not a substitute for confirmation through the parties’ legal representatives.
Keep the complete correspondence, including attachments and versions. If a telephone conversation is important, make a prompt note of what was said, by whom and when.
Off the plan changes need prompt review
Off-the-plan contracts may permit specified changes, but statutory protections can still apply. Under the NSW disclosure regime, vendors must notify purchasers of certain changes to material particulars. Not every alteration qualifies.
For relevant contracts, a purchaser who would not have entered the contract had the change been known, and is materially prejudiced by it, may have rescission rights or an alternative compensation claim. The applicable rights generally must be exercised within 14 days of notification or service of registered documents revealing the change.
Send any notice and amended plans to your lawyer immediately. Do not assume that continuing negotiations preserves the deadline, or that you can reject every change to the development.
A real case about an extended deadline
In Tanwar Enterprises Pty Ltd v Cauchi [2003] HCA 57, a purchaser agreed to buy three adjoining parcels of land in Sydney. Following earlier delays and a dispute, the parties executed deeds requiring completion by 4 pm on 25 June 2001, expressly making time essential.
The purchaser’s overseas finance arrived the following day, but the vendors terminated the contracts. The High Court unanimously dismissed the purchaser’s appeal: the circumstances did not make the vendors’ exercise of their termination rights unconscionable.
The case shows that an agreed extension can impose a strict final deadline. Understand the conditions attached to the extension and confirm that finance will be available before committing to it.
If the proposed change becomes disputed
Keep the signed contract, proposed variations, messages, inspection evidence and payment records together. Ask your lawyer to identify the existing obligation, whether a change was agreed, and which deadlines remain operative.
Do not deduct money, refuse settlement or announce termination without advice about your rights. Negotiation may resolve the issue, but it does not itself change the contract. If repairs or renovations involve a separate building contract, have that contract reviewed too; changing the sale terms does not automatically change the builder’s obligations.
Speak with Christine before agreeing to a variation
Contact Christine and the CM Lawyers team with your contract, the proposed changes and the next deadline. We can review the wording, explain its effect on your obligations and help document the agreed position.
Have a lawyer check the variation before signing or relying on it, even when the change seems minor. Keep the completed variation with the original contract and confirm that the lender and settlement representatives have the final agreed terms.
This article provides general information about NSW property sale contracts. It is not a substitute for legal advice about your contract and circumstances.
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