An option agreement is an agreement between two parties where one party gives the other party a right to buy or sell something at an agreed price, within a certain period of time.
In an option agreement real estate context, option agreements are commonly used by developers who want to secure the right to acquire land, often a development site, while they carry out due diligence or submit approvals to Council for Development Applications before fully committing to the purchase.
If you are considering an option to purchase agreement, it is worth getting the structure and wording right from the outset. We are experienced Sydney property solicitors who draft, review, and negotiate option agreements to protect both the legal position and commercial intent of the parties before anyone is locked into a full transaction.

When an Option Agreement May Be the Right Approach
An option agreement can make sense where parties want to secure a future deal, but need time before committing to a standard contract for sale. This can be relevant when:
- A developer wants to tie up a site while approvals or other investigations are underway.
- A buyer needs time for due diligence before deciding whether to proceed.
- Both parties want certainty around price and key terms now, with the transaction to occur later.
- The sale is being approached in stages, rather than as a single immediate purchase.
Because option agreements can shift negotiating power and risk, it is smart to get advice early on whether an option structure is actually the right fit for your deal.
What Types of Option Agreements Are There
There are generally three types of options:
Call option
A call option is where the buyer has a right, but no obligation, to buy the land from the seller.
Put option
A put option is where the seller has a right, but no obligation, to sell the land to the buyer.
Put and call option
A put and call option combines both, where the buyer can “call” for the contract, or the seller can “put” the contract to the buyer.
Key Terms in an Option to Purchase Agreement
Option agreements only work properly when the main terms are clear and consistent. Common features include:
Option fee
This is the fee payable for granting the option. It is often a percentage of the purchase price, or a figure agreed between the parties. If the option is exercised and the property is purchased, the option fee is generally credited towards the purchase price.
Option period
This is the period of time in which the option can be exercised. It is normally for 12 to 24 months, but can vary depending on what the parties agree. After the option period expires, the option lapses and the option fee will be forfeited.
Contract of sale annexure
A complete Contract of Sale for the property should be annexed to the option agreement. This is the contract that will be entered into once the option is exercised.
Purchase price
This is the price of the property that will be paid by the buyer when exercising the option.
Caveat rights
The buyer normally has the right to lodge a caveat over the land to secure their interest under the option. The caveat can be permissive, allowing later registrations on title, or absolute, forbidding all later registrations.
Assignment or novation
A buyer will often want the right to assign the benefit of the option to a third party. This can help if they do not want to proceed with development but have a substitute purchaser, or if they want to set up a company later for the development and assign the option to that new company.
Stamp duty implications
Option agreements are normally subject to stamp duty. The amount depends on the option fee payable, and stamp duty on the market value of the land when the option is exercised.
Risks of Using Poorly Drafted Option Agreements
Option agreements can cause real issues when terms are unclear or do not match what the parties thought they agreed to. Problems often arise where:
- Exercise rights or timeframes are unclear
- The annexed Contract of Sale is incomplete or inconsistent
- There is disagreement about how the option fee is treated
- Caveat protection does not reflect the commercial risk
- Assignment rights do not suit the buyer’s intended structure
- Stamp duty implications are not properly considered
Because an option agreement can shape the entire transaction, it should not be treated like a simple template document.
How Rockliffs Lawyers Assists with Option Agreements
We assist you with option agreements in NSW real estate transactions, including:
- Drafting option agreements that reflect the commercial deal
- Reviewing and negotiating proposed option terms
- Advising on risk and enforceability in the context of the transaction
- Preparing or reviewing the annexed Contract of Sale
- Working with other advisors where needed to support the transaction
The goal is simple: reduce uncertainty, protect your position, and keep the deal workable.
Acting for Developers, Investors, Buyers, and Property Owners
This service is commonly relevant for:
- Developers securing future development sites while approvals and investigations are underway
- Property investors using strategic acquisition structures
- Buyers who want time before fully committing to purchase
- Landowners negotiating future sale arrangements
We can assist on either side of an option agreement, with advice tailored to the role and objectives of the party involved.
Option Agreements in NSW Property Transactions
Option agreements used in NSW property transactions should be drafted with care, including how the contract is structured, how the option is protected, and how stamp duty may apply.
Having a Sydney-based property solicitor involved early helps keep the agreement aligned with the transaction’s purpose and avoids surprises later.
Speak with Our Lawyers
If you are considering signing, granting, or exercising an option agreement, speak with our experienced lawyers first. We can help you get clarity on the terms, protect your position, and keep the transaction aligned with your commercial goals.
FAQs
Is an option agreement legally binding before the property is actually purchased?
An option agreement sets out the agreed right to buy or sell within the option period, along with the key terms such as the option fee, option period, and the annexed Contract of Sale.
If you need clarity on how this applies to your situation, it is best to get legal advice before signing.
Can an option agreement be used for both residential and commercial property?
Option agreements are used in property contexts, including for land and development sites.
Whether an option structure suits your specific property and transaction should be assessed based on your objectives and the terms proposed.
What happens if the option is not exercised before the option period ends?
Generally, once the option period expires, the option lapses and the option fee will be forfeited.
Should both parties get separate legal advice before signing an option agreement?
Option agreements can affect rights, timing, and risk for both sides. Getting legal advice before signing helps ensure the terms match what you intended and that you understand the consequences.
Can an option agreement be negotiated after the main commercial terms are already discussed?
Yes, and this is common. The key is making sure the legal documents reflect the agreed commercial position, including the option fee, option period, and the annexed contract.
