"Can you give me a quote?" Most tradies use the words quote and estimate interchangeably. In conversation, that's fine. In business — especially when disputes arise — the difference between a quote and an estimate is legally significant and can determine whether you're locked in to a price or protected when costs blow out.

This guide explains the legal distinction, when to use each, how to protect yourself, and what to do when clients try to hold you to a number that was always meant to be indicative.

A Quote (Fixed Price)

A quote is a firm offer to complete specified work for a fixed price. When a client accepts your quote, it becomes a binding contract — you agree to do the work for the quoted amount, and the client agrees to pay it.

If the actual cost of the work exceeds your quoted price (because you underestimated, materials cost more, or it took longer), that's typically your problem — you've agreed to the price.

If the client wants to pay less than the quoted price after the work is done, you're legally entitled to the full quoted amount (subject to the work being completed as specified).

A quote creates a binding price commitment.

An Estimate (Indicative Price)

An estimate is an informed approximation of likely cost. It's not a binding price — it's guidance that helps the client budget. The actual cost may be higher or lower.

If a job comes in higher than your estimate, you're generally entitled to charge the actual cost — though the estimate creates an expectation the client may dispute if the variance is large.

An estimate creates an expectation, not a commitment.

The Middle Ground: Provisional Sums

In formal construction contracts, provisional sums are used for components of work where the scope or cost can't be determined accurately at quoting stage. The contract includes an estimated amount (the provisional sum), with the final cost settled once that component is completed.

For example: "Allow $3,500 for tiling — provisional sum based on estimated area, final cost to be agreed on measurement."

Why the Distinction Matters in Practice

For the Tradie

If you quote a job and it takes longer or costs more than expected:

  • Under a fixed-price quote: You may absorb the loss
  • Under an estimate: You can charge actual costs (within reasonable variance)

Many tradie disputes arise from this exact point: the client thought it was a quote; the tradie thought it was an estimate. The language you use — and what you document — determines who's right.

For the Client

Clients prefer quotes (price certainty) and tradies often prefer estimates (flexibility). This tension is normal in commercial negotiation. The key is being explicit about which you're providing and ensuring both parties understand the commitment.

What Australian Consumer Law Says

Under the Australian Consumer Law (ACL), which applies in every state and territory:

Section 74 — Unfair Contract Terms: Contract terms that create significant imbalances in parties' rights (like a term allowing the tradie to charge anything above an estimate without limit) may be unfair and unenforceable.

Section 18 — Misleading or Deceptive Conduct: Providing an estimate you knew was unrealistically low to win the job, then presenting a significantly higher final invoice, could constitute misleading conduct.

Building-specific legislation: In most states, domestic building contracts above a threshold (typically $10,000 for major domestic contracts) must comply with state building legislation. In Victoria (Domestic Building Contracts Act), NSW (Home Building Act), Queensland (Queensland Building and Construction Commission Act), there are specific rules about what must be in a building contract, and there are protections for both parties around price variation.

The practical implication: If you're doing residential work above the threshold in your state, understand your state's domestic building contract legislation. Using a standard HIA or MBA contract is the safest approach — these are drafted by industry bodies to comply with state law.

When to Use a Quote vs an Estimate

Use a Fixed-Price Quote When

  • You can clearly define the scope of work
  • Material quantities are known or can be measured
  • Site conditions are visible and straightforward
  • The timeline is predictable
  • The client needs price certainty (residential clients, small commercial)

Use an Estimate When

  • The full scope isn't clear until work begins (investigation, remediation)
  • Site conditions may reveal unforeseen work (underground services, concealed water damage)
  • Materials or subcontractor costs are volatile
  • The work requires staged decision-making (design-and-construct)
  • It's a rough order of magnitude for budgeting purposes before detailed planning

Use a Day Rate or Time and Materials When

  • The scope is genuinely indeterminate
  • The client wants maximum flexibility in scope
  • Variation is built into the nature of the work (maintenance, investigation, repair)
  • You're working in an environment with high uncertainty

Writing a Quote That Protects You

A good trade quote is more than a number. It's a document that defines what you'll do, what you won't do, and under what conditions.

Essential Elements of a Tradie Quote

Detailed scope description: Not "install new bathroom" — "supply and install 1 × [brand/model] vanity, 1 × [brand/model] toilet suite, 1 × [dimensions] shower screen with frameless glass, 1 × [brand/model] shower mixer, tiling to shower walls using tiles supplied by client."

Inclusions: What work is specifically included. The more specific, the better.

Exclusions: What is NOT included. This is where most variation disputes originate. Common trade exclusions:

  • "Excludes removal of existing tiles and surface preparation beyond [described standard]"
  • "Excludes plasterboard repairs to surrounding walls"
  • "Excludes connection to mains power/water — by licensed specialist"
  • "Excludes any work required due to discovery of asbestos, hazardous materials, or existing defects"
  • "Excludes council approvals and permits — client responsibility"

Provisional sums/allowances: "Tiling allowance: $X based on standard tiles at $Y/m². Client selection above this price will be charged as a variation."

Quote validity: "This quote is valid for 30 days from [date]. After this date, a revised quote may be required due to material price movements."

Payment terms: "Deposit of X% required to confirm booking. Progress payment milestones as follows: [milestone] = X%, [milestone] = X%. Final payment within 14 days of completion."

Variation clause: "Any changes to the scope of work will require a written variation order, agreed and signed before work proceeds. Variations are charged at [rates]."

The Danger of Verbal Quotes

Many tradies give verbal quotes over the phone or on-site and confirm prices verbally. This is risky:

  • The client may remember a different number than you stated
  • You have no record of the scope agreed to
  • Variations and inclusions/exclusions are disputed without documentation
  • If a dispute arises, you have no evidence of what was agreed

The minimum standard: Any quote over $500 should be in writing — even if it's just an email. For jobs over $5,000, a formal written quote with inclusions and exclusions is essential.

Modern quoting apps (Tradify, Buildxact, ServiceM8, Simpro) make this fast: build your quote on your phone, add the scope, send it as a PDF via email. Client approves by email response or electronic signature. Done — and documented.

Estimate Protection Strategies

If you're providing an estimate rather than a quote, protect yourself with these clauses:

Variance clause: "This estimate assumes standard conditions. If actual costs vary by more than [X%] from this estimate, the tradie will notify the client and seek approval before proceeding."

Hourly rate clause: "Work will be charged at $X per hour, with materials at cost plus [X]% markup. Current estimate based on [X] hours, subject to final measurement."

Minimum/maximum: For some work, you can provide a range: "Estimated cost: $6,500–$8,500 depending on [variable]. Client will be notified if actual costs are projected to exceed $8,500 before that point."

Scope assumption statement: "This estimate is based on the following assumptions: [list]. If these assumptions prove incorrect, additional costs will be quoted as a variation."

When Clients Try to Hold You to an Estimate as a Quote

This is a common dispute scenario: the tradie provides an estimate, the client treats it as a fixed price, and the final invoice is higher.

Your position:

  1. Produce the original document and point to the language ("estimate," "approximate," "indicative")
  2. Show where inclusions/exclusions clearly identified scope limits
  3. Document any additional work or changed conditions that drove the cost increase
  4. Offer a brief, good-faith discussion — not a negotiation from a position of weakness

If the client refuses to pay:

  • Issue a formal letter of demand citing the contractual position
  • Provide evidence that the document was clearly an estimate, not a quote
  • Consider the dispute resolution mechanisms available in your state (Fair Trading, NCAT, VCAT, QBCC, etc.)
  • For amounts over $5,000–$10,000, legal advice from a construction lawyer may be warranted

Building Contract Thresholds by State

For residential building work above these amounts, specific domestic building contracts are required by law:

  • NSW — $5,000
  • VIC — $10,000 (major domestic building work)
  • QLD — Any amount (written contract required)
  • WA — $7,500
  • SA — $12,000
  • ACT — Any domestic building work
  • NT — $12,000
  • TAS — $12,000

Check your state's building commission or fair trading authority for current thresholds. Using a standard HIA or Master Builders contract is the safest approach for residential work above these amounts.

Comparison: Quote vs Estimate vs Day Rate

  • Price commitment — Fixed — you're bound — Indicative — actual may vary — Actual cost as incurred
  • Risk holder — Tradie (if over) — Shared — Client
  • Suitable for — Clear, defined scope — Uncertain scope — Genuinely open scope
  • Documentation needed — Detailed scope — Assumptions and variance clause — Rate agreement + timesheets
  • Dispute risk — Low if documented — Medium — Medium-high (scope creep)
  • Preferred by clients — Yes — Often — No (preference for certainty)
  • Best for tradie — Low uncertainty jobs — Medium uncertainty — High uncertainty or maintenance

Frequently Asked Questions

Q: A client is threatening to sue me because my final invoice is 20% above my estimate — do they have a case?
Depends on the documentation. If your document clearly said "estimate" and included appropriate variance language, a 20% variance may be defensible. If your document said "quote" or was ambiguous, they may have a stronger position. Get legal advice and gather all your documentation.

Q: Can I quote and then raise prices if materials go up significantly?
A fixed-price quote generally locks in the price. However, some quotes include material escalation clauses — "prices are subject to adjustment if material costs increase by more than X% from the quote date." Without such a clause in your quote, material price increases are typically your risk. This is why quote validity periods matter.

Q: Is a text message acceptance enough to form a contract?
Yes. A client's text message accepting a quoted price creates a binding contract in Australian law. Electronic communication (email, text, WhatsApp) is legally equivalent to written communication for most contract purposes. Keep all digital acceptance records.

Q: Do I need a lawyer to write my quote template?
Not necessarily. Industry body templates (HIA, MBA) are a good starting point and are legally reviewed. For high-value commercial work, having a solicitor review your standard contract terms is a worthwhile investment. For standard residential trade work, a clear, well-structured quote with inclusions, exclusions, and variation clauses is sufficient for most situations.