Quote and Variation Agreements Adelaide: When a Quote Binds and How to Change the Job
Quotes and variation agreements in South Australia
A quote tells a client what it is buying and for how much, and a variation agreement records the change when the job moves. Talon Legal drafts quotation templates, quote agreements and variation agreements for Adelaide consultants, event managers, photographers, designers and other service businesses, and reviews quotes for the clients who receive them. Book a same-day free 30-minute consultation or call (08) 7094 2021.
Quote and variation agreement key facts
| Issue | Position in South Australia |
|---|---|
| What a quote should state | Scope, price, whether the price is fixed, how long it is open, the deposit, how acceptance happens and the terms it incorporates. |
| Signed acceptance | A person who signs a document known to contain contractual terms is generally bound by them, read or not (Toll v Alphapharm at [57]). |
| Email acceptance | A transaction is not invalid because it took place by electronic communications (Electronic Communications Act 2000 (SA) section 7(1)). |
| Estimates | A representation about a future matter made without reasonable grounds is taken to be misleading (ACL section 4(1)). |
| Household services | Quoting part of the price requires the single total price, stated prominently (section 48(1)). |
| No time stated | For a consumer, services must be supplied within a reasonable time (section 62). |
| Price change clauses | A one-sided power to raise the price can be unfair in a standard form consumer or small business contract (sections 24 and 25(f); JJ Richards at [56](b)). |
| Maximum penalty | Body corporate: the greater of $100,000,000 and three times the benefit or, if that cannot be determined, 30% of adjusted turnover. Anyone else: $2,500,000 (section 224). |
| Cancellation charges | A sum payable on default is open to challenge if out of all proportion to the interests protected (Paciocco v ANZ, Kiefel J at [29]). |
| Disputed extra charges | In AIBI, disputed invoices were payable because the contract's dispute process had not been activated ([137] to [139]). |
| Time limit | Contract claims: six years (Limitation of Actions Act 1936 (SA) section 35). |
| First step | Same-day free 30-minute consultation. Call (08) 7094 2021. |
Need a quote and variation agreement lawyer in Adelaide?
Our lawyers draft quote and variation agreements for Adelaide service businesses, and advise clients on quotes they have received. A quote the client accepts becomes the contract, so it should state the scope, the price, how long it is open, the deposit and the terms that apply. The Australian Consumer Law (ACL), in Schedule 2 of the Competition and Consumer Act 2010 (Cth), controls what can be said about price and when a one-sided price change clause is void. This page states the law current to 6 November 2026.
This guide is part of our professional services practice. Related guides cover service agreements and terms of business, consulting agreements and website development agreements.
Photographers can see our guide to photography terms and conditions for deposits and cancellation fees.
Free Consultation. Send us your quote template, or the quote you have been given. Book a same-day free 30-minute consultation or call (08) 7094 2021.
On this page
- What should a quote say?
- When does a quote become a contract?
- Is an estimate different from a fixed quote?
- What if the quote gives no time for the work?
- How should a variation be agreed?
- Can the price go up after acceptance?
- How should deposits and cancellation charges work?
- How are disputes about extra work resolved?
- How similar matters tend to play out
- How we act on quote and variation agreements
- Case law
- Frequently asked questions
What should a quote say?
Enough that the client knows exactly what it is accepting. A quote that will become the contract should state:
- The services or deliverables, line by line where the job has parts, and anything excluded.
- The price, whether it is fixed or an estimate, and whether GST is included.
- How long the quote is open, commonly 14 or 30 days from issue.
- The deposit, when it is due and when the balance is payable.
- How the client accepts, such as by signing, accepting online or paying the deposit.
- The terms of business or service agreement that apply, attached or linked.
A quote often follows figures given earlier by phone or email. It should say that it replaces them, so neither side can later rely on a number from an earlier conversation. Where the client is a company, the person signing should have authority to bind it. The service agreements and terms of business guide covers the terms a quote usually incorporates.
When does a quote become a contract?
Usually when the client accepts it, in a way the quote allows, while it is still open. In most cases the quote is the provider’s offer and the acceptance makes the contract. Arguments start when acceptance is unclear, as when a client says “go ahead” by phone or simply sends instructions. A quote that lists the forms of acceptance it will treat as binding, such as a signature, online acceptance, payment of the deposit or instructions given after receiving the quote, closes most of those arguments. The quote should also say the provider need not start until it is accepted and the deposit paid.
Signing carries weight. In Toll (FGCT) Pty Ltd v Alphapharm Pty Ltd [2004] HCA 52, the High Court’s joint reasons stated the general rule. A person who signs a document known to contain contractual terms and to affect legal relations is bound by them, whether or not they read it, absent a vitiating element or a claim for equitable or statutory relief ([57]). A signed quote that expressly incorporates the provider’s terms of business brings those terms into the contract.
Acceptance by email, e-signature or online form counts. A transaction, which includes an offer and an acceptance, is not invalid because it took place wholly or partly by electronic communications (Electronic Communications Act 2000 (SA) sections 5 and 7(1)). Once the validity period ends, the provider is free to re-quote, and the quote should say so.
Is an estimate different from a fixed quote?
Yes. A fixed quote commits the provider to the price for the stated scope. An estimate is a forecast of what the job is likely to cost. The document should say which it is, and its heading should match.
An estimate is a representation about a future matter. If the provider makes it without reasonable grounds, it is taken to be misleading (ACL section 4(1)), and misleading or deceptive conduct in trade or commerce is prohibited (section 18(1)). False or misleading representations about price are separately prohibited (section 29(1)(i)). The safeguard is to base the estimate on the information available and record its assumptions in the quote.
A document headed “quote” and presented as the price, but drafted so the provider can move the figure at will, invites an argument that the client was misled. If the price may change, the quote should name the assumptions it rests on and the process for pricing a change, which the client can decline. A clause disclaiming liability for “reasonable variations” will be read by its natural and ordinary meaning in the context of the whole contract, and where appropriate against the provider if it is ambiguous (Darlington Futures Ltd v Delco Australia Pty Ltd [1986] HCA 82 at [16]).
For services of a kind ordinarily acquired for personal, domestic or household use, a provider that quotes part of the price must also state the single total price, prominently and as a single figure (section 48(1)). The rule does not apply to a representation made only to a body corporate (section 48(4)).
What if the quote gives no time for the work?
For a consumer, the law fills the gap. Where the time for supply is not fixed, services must be supplied within a reasonable time (ACL section 62). A client acquires services as a consumer if the amount paid or payable is $100,000 or less, or the services are of a kind ordinarily acquired for personal, domestic or household use (section 3(3); regulation 77A of the Competition and Consumer Regulations 2010). The guarantees of due care and skill and of fitness for a purpose the consumer makes known also apply (sections 60 and 61(1)), and a term cannot exclude them (section 64(1)).
A reasonable time is an argument waiting to happen. The quote should give a start date or window and a completion date, and say what happens to the timetable if the client is late with information or approvals.
How should a variation be agreed?
In writing, before the extra work starts. Many disputes about quoted jobs turn on what changed and who agreed to pay for it, and a variation agreement answers both at the time. It should record:
- Why the variation is needed: the client asked for it, or a problem has come to light that was not known when the quote was given.
- The changed scope, described as specifically as the original.
- The price of the change, or the rate at which it will be charged.
- The effect on the timetable, including any likely delay.
- Any change to the deposit or the balance payable.
- Signatures, or a clear written acceptance, from both sides.
The original quote or service agreement should set the process. It should say how a variation is requested and priced, and that work on the change starts only once the client accepts in writing. It should also say whether the provider may charge for work already done on a change before the variation is signed. If the client declines a variation, the original scope continues, and the quote should say so.
Can the price go up after acceptance?
Only as the contract allows, and in a standard form consumer or small business contract a one-sided power to raise the price is exposed to the unfair terms law. An unfair term in such a contract is void (ACL section 23(1)). A contract for services is a small business contract if at least one party employs fewer than 100 persons or had turnover under $10,000,000 in its last income year (section 23(4)). A contract is presumed to be standard form unless the provider proves otherwise (section 27(1)).
A term is unfair if it would cause a significant imbalance in the parties’ rights and obligations, is not reasonably necessary to protect the legitimate interests of the party it advantages, and would cause detriment if relied on (section 24(1)). The provider must prove a term is reasonably necessary (section 24(4)). The statutory examples include terms letting one party alone vary the contract’s terms or the characteristics of the services, and a term letting one party vary the upfront price without the other having a right to terminate (section 25(d), (f) and (g)). The upfront price itself is not assessed (section 26(1)(b)).
In ACCC v JJ Richards & Sons Pty Ltd [2017] FCA 1224, the Court accepted that a term allowing the supplier to increase prices for any reason, with no corresponding right for the customer to terminate or to obtain a change of scope or a lower price, created a significant imbalance ([56](b)). On agreed facts, it was declared unfair and void with seven other terms. When that case was decided, an unfair term was void but not penalised. Unilateral variation terms were also among the categories declared unfair, on the respondents’ concession, in ACCC v Fujifilm Business Innovation Australia Pty Ltd [2022] FCA 928.
Since 9 November 2023, making a standard form consumer or small business contract containing an unfair term the provider proposed, or applying or relying on one, is a contravention, and each term counts separately (section 23(2A) to (2C)). The maximum penalty for a body corporate is the greater of $100,000,000 and three times the benefit or, if that cannot be determined, 30% of adjusted turnover during the breach turnover period. For anyone else it is $2,500,000 (section 224(3) and (3A)).
A price adjustment clause is easier to defend if it is tied to stated triggers, such as a client-requested change or a condition the quote expressly assumed, and lets the client decline the change or end the contract.
How should deposits and cancellation charges work?
The deposit and cancellation terms belong in the quote or the terms it incorporates, accepted before the deposit is paid. Common structures are a percentage of the price, or a fixed booking deposit with the balance due a set number of days before the work. Where the provider must buy items for the job, a deposit equal to their cost is common, and the quote should say what happens to made-to-order and returnable items.
The quote should also say when the deposit becomes non-refundable and what happens to it if the provider cancels. A cancellation scale tied to notice is easier to justify if it reflects what the provider actually loses, such as bookings turned away and costs it cannot recover.
A sum payable on the client’s default is tested against the penalty doctrine. In Paciocco v Australia and New Zealand Banking Group Ltd [2016] HCA 28, Kiefel J, with whom French CJ agreed, said the question is whether such a sum is out of all proportion to the interests of the party the provision is intended to protect, which may be business or financial interests ([29]). In a consumer or small business standard form contract, a term that penalises only the client for breach or termination is also a statutory example of a term that may be unfair (ACL section 25(c)).
How are disputes about extra work resolved?
By the documents first. The first question is whether the work was inside the quoted scope. If it was not, the next is whether the client asked for it and agreed to pay, in writing or in the way the contract allows. A signed variation agreement usually settles both. Without one, the provider relies on emails and messages showing the request and the price, and the client on the original quote.
Withholding payment is a common response, and it carries risk. In AIBI Holdings Pty Ltd v Virtual Technology Services Pty Ltd [2022] FCA 696, an IT services provider and its customer fell out over service quality and additional charges, and the customer withheld payment ([2]). The contract allowed disputed amounts to be withheld only once its dispute resolution mechanism had been activated. It had not been, so the invoices were payable in full ([137] to [139]), and the provider’s suspension of its helpdesk services was not a breach ([140]).
A dispute clause requiring written notice and mediation before litigation gives both sides a path. If the dispute goes further, an action founded on contract must be commenced within six years after the cause of action accrued (Limitation of Actions Act 1936 (SA) section 35). An action for damages under the ACL may be commenced within six years after the day the cause of action accrued (ACL section 236(2)).
How similar matters tend to play out
Three illustrations of how the law on this page combines on ordinary facts. They are not predictions. Outcome depends on the documents, the evidence and the court.
Lower range. A videographer emails a quote that is open for 14 days. The client replies “yes, book it in” on day 20. The quote has lapsed on its own terms, so the videographer can confirm the old price in writing or re-quote. A reply on day 10 would have been a valid acceptance (Electronic Communications Act section 7(1)).
Middle range. An interior designer quotes a fixed price for a design. Midway, the client asks by phone for two more rooms. The designer does the work and invoices for it, without a signed variation, and the client says the rooms were always part of the brief. The answer turns on the quote’s scope and the messages between them. A one-page variation agreement, signed before the extra work, would have settled it.
Upper range. A consultancy’s standard quote terms let it raise any quoted price on notice, for any reason, with no right for the client to cancel. It uses the template with many small business clients. The term resembles the one the Court accepted created a significant imbalance in JJ Richards ([56](b)). Relying on it risks a contravention each time (section 23(2C)), and the maximum penalty for a company is at least $100,000,000 (section 224(3A)). A right to decline the increase and recover the deposit reduces the exposure.
How we act on quote and variation agreements
We draft quote and variation agreements for service businesses and review quotes for clients. For a provider, the aim is a quote that forms a clear contract and a variation process the team will actually use. For a client, it is a fixed scope and a price that does not move without its agreement.
| Stage | What happens | What we do |
|---|---|---|
| Template | The quote and its terms are drafted or reviewed. | Draft scope, price, validity, deposit, acceptance and incorporation terms. |
| Variations | Jobs change. | Draft a one-page variation agreement and the clause requiring it. |
| Consumer check | Some clients are consumers or small businesses. | Check price representations, guarantees and unfair terms exposure. |
| Dispute | A client disputes extra charges or cancels. | Advise on the documents and draft the demand or response. |
| Review | Prices, services or the law change. | Update the templates. |
We cannot promise an outcome, and no lawyer can. We can make sure your quotes and variations say what you mean before a dispute tests them.
Every hour matters. Book a same-day free 30-minute consultation, or call (08) 7094 2021 now.
Quote and variation agreement case law
None of the decisions below concerned a quotation; each decided a point that applies to one.
| Case | Court | Principle | Pinpoint |
|---|---|---|---|
| Toll (FGCT) Pty Ltd v Alphapharm Pty Ltd [2004] HCA 52 | High Court | A signed contractual document binds, read or not | [57] |
| ACCC v JJ Richards & Sons Pty Ltd [2017] FCA 1224 | Federal Court | Unilateral price variation term unfair | [56], [57] |
| ACCC v Fujifilm Business Innovation Australia Pty Ltd [2022] FCA 928 | Federal Court | Unilateral variation terms declared unfair by consent | [1], [3] |
| AIBI Holdings Pty Ltd v Virtual Technology Services Pty Ltd [2022] FCA 696 | Federal Court | Disputed additional charges withheld only through the dispute process | [2], [137] to [140] |
| Darlington Futures Ltd v Delco Australia Pty Ltd [1986] HCA 82 | High Court | Construing exclusion and limitation clauses | [16] |
| Paciocco v Australia and New Zealand Banking Group Ltd [2016] HCA 28 | High Court | Test for a sum payable on default | [29] |
Case notes
Toll (FGCT) Pty Ltd v Alphapharm Pty Ltd [2004] HCA 52
The joint reasons stated the general rule that a person who signs a document known to contain contractual terms and to affect legal relations is bound by them, whether or not they read it, absent a vitiating element or a claim for equitable or statutory relief ([57]). The appeal was allowed.
ACCC v JJ Richards & Sons Pty Ltd [2017] FCA 1224
On agreed facts, Moshinsky J declared eight terms of small business standard form contracts unfair and void. The Court accepted that the price variation term caused a significant imbalance ([56](b)), and that the supplier bore the onus of showing it was reasonably necessary ([57]).
ACCC v Fujifilm Business Innovation Australia Pty Ltd [2022] FCA 928
The respondents supplied office equipment, software and support services ([1]). With the respondents conceding the terms were unfair, Stewart J made consent declarations that ten categories of terms, including unilateral variation and unfair payment terms, were unfair and void ([3]).
AIBI Holdings Pty Ltd v Virtual Technology Services Pty Ltd [2022] FCA 696
An IT services provider and its customer disputed service quality and additional charges, and the customer withheld payment ([2]). Because the contract’s dispute mechanism had not been activated, the invoices were payable in full and the provider’s suspension of its helpdesk was not a breach ([137] to [140]). The application was dismissed.
Darlington Futures Ltd v Delco Australia Pty Ltd [1986] HCA 82
On appeal from South Australia, the High Court held that exclusion and limitation clauses are construed by their natural and ordinary meaning, in the light of the whole contract and its nature and object, and where appropriate against the party that put them forward if ambiguous ([16]).
Paciocco v Australia and New Zealand Banking Group Ltd [2016] HCA 28
Kiefel J, with whom French CJ agreed, asked whether a provision for payment of a sum on default is out of all proportion to the interests it is intended to protect, which may be business or financial interests ([29]). Both appeals were dismissed.
Frequently asked questions
Is a quote legally binding?
Once the client accepts it, usually yes. The accepted quote and any terms it incorporates form the contract, and a signed quote generally binds the client whether or not it read the terms (Toll v Alphapharm at [57]).
Can a client accept a quote by email?
Yes. A transaction, including an offer and acceptance, is not invalid because it took place by electronic communications (Electronic Communications Act 2000 (SA) sections 5 and 7(1)).
How long should a quote be valid for?
Commonly 14 or 30 days from issue. The quote should state the period, and that the provider may re-quote after it ends.
What is the difference between a quote and an estimate?
A fixed quote commits the provider to the price for the stated scope, while an estimate is a forecast. An estimate made without reasonable grounds is taken to be misleading (ACL section 4(1)).
Can a provider charge more than the quoted price?
Only for agreed variations or as the contract allows. A one-sided power to raise the price can be unfair in a standard form consumer or small business contract (ACL sections 24 and 25(f); JJ Richards at [56](b)).
Does a variation have to be in writing?
It should be, and many contracts require it. A signed variation agreement is the best evidence of the changed scope, price and timing.
What if the quote does not say when the work will be done?
For a consumer, the services must be supplied within a reasonable time (ACL section 62). The quote should give dates.
Is a deposit refundable if the client cancels?
That depends on the quote and the terms it incorporates. A sum payable on the client’s default that is out of all proportion to the interests it protects is open to challenge (Paciocco v ANZ, Kiefel J at [29]).
Can a client cancel after accepting a quote?
Only if the contract or the law allows it. A consumer may terminate an unsolicited consumer agreement, such as one made after uninvited telephone negotiations for more than $100, during the termination period (ACL sections 69(1) and 82).
Can a client withhold payment while it disputes extra charges?
Only as the contract allows. In AIBI, the contract allowed disputed amounts to be withheld only once the dispute process was activated; it was not, so the invoices were payable in full ([137] to [139]).
Do I need a lawyer for quote and variation agreements?
For templates you will use on every job, yes. A lawyer can set up quote and variation agreements that form a clear contract and stay clear of the unfair terms rules. A free 30-minute consultation will tell you where you stand.