How to Respond to a Contractor's Minor Case Claim in WA Without a Lawyer

If a contractor has filed a minor case claim against you in the Magistrates Court of Western Australia for an ordinary unpaid invoice or contract dispute under A$10,000, you can handle the response yourself. The minor case division was designed for exactly this situation — self-represented parties, simplified procedure, and a Magistrate who expects neither side to have legal training. Your first move is not to panic or call a solicitor. It is to check the deadline on those papers (14 calendar days after service within WA, counting begins the next day), confirm the claim belongs in this court, and start organising your evidence.

First: Is This the Right Court?

Before you spend time on your response, check the jurisdictional boundary. The Minor Case track handles claims up to A$10,000. Ordinary breach-of-contract or unpaid-invoice claims for trade services under that amount can proceed in the track. Regulated building work, home building contract breaches, and remedy orders fall within the statutory domain of the Building Commissioner or State Administrative Tribunal (SAT). A claim above A$10,000 is outside the Minor Case track; claims up to A$75,000 may fall under General Procedure.

If the contractor's claim is for an ordinary unpaid invoice of A$8,000 for tiling work, it may proceed in the Minor Case track. If the dispute concerns regulated building work or a home building contract breach, check whether it falls within the Building Commissioner or SAT's statutory domain; the total contract price alone does not determine the correct forum.

If the dispute falls within the statutory domain of the Building Commissioner or SAT, the Magistrates Court lacks jurisdiction to hear it; raise that issue in your Form 15A response.

Your 14-Day Countdown

The clock starts the day after the contractor effectively serves you with the claim papers. If you were handed the Form 4 in person within WA, count 14 calendar days from the next day. If served by post, service is effective on the date the documents would ordinarily be delivered; do not add a separate postal allowance. If served elsewhere in Australia, the response period is 21 calendar days from the day after service.

Write down the exact deadline. Put it in your calendar. Everything else in this article is secondary to that date. If you miss it, the contractor may apply for default judgment. For a specified debt, a registrar may enter judgment for the claimed sum plus allowable costs without a hearing; for unliquidated damages, the amount may be assessed from documents or at an assessment hearing.

If you are reading this and the deadline has already passed: check the eCourts Portal immediately. A late Form 15A lodged through the portal may be accepted if it is filed before the claimant's default judgment application is processed and granted. If judgment has been entered, apply under Rule 42 to set it aside using Form 23 and a Form 2 affidavit showing a reasonable excuse and a prima facie defence on the merits. The application is due within 21 calendar days after judgment unless the court allows an extension.

Understanding the Contractor's Claim

The contractor's Form 4 will set out what they are claiming and why. Read it carefully and identify:

The amount claimed. This is the number you are defending against. It may include the original invoice amount plus filing fees and interest.

The basis of the claim. Typically one of: unpaid invoice for completed work, payment for materials supplied, or damages for breach of contract (for example, you hired someone else to finish the job).

The documents attached. Note whether the claim papers include invoices, a contract or quote, and correspondence. These are the documents you need to compare against your own evidence.

The case number. You will need this to find your case on the eCourts Portal and to file your response.

Building Your Defence for a Contractor Dispute

Contractor disputes in the minor case division tend to fall into predictable patterns. Your defence needs to address the specific facts, not general grievances.

If the work was incomplete

Your evidence should include: the original contract or quote showing the agreed scope, photographs of the incomplete work (dated), any messages or emails where you raised the incomplete work with the contractor, and quotes from other tradespeople for the cost of completing the remaining work. The cost to complete is your primary counterargument to the invoice — if the contractor invoiced A$6,000 for a kitchen renovation and the scope was only 70% complete, a quote of A$3,000 to finish the remaining 30% directly challenges the claim.

If the work was defective

Document the defects with photographs, timestamped if possible. Get a written assessment from another licensed tradesperson — not just a verbal opinion, but a written report that identifies the defects and estimates the cost to rectify them. If you had the defects repaired, keep the invoices. The court wants to see what was wrong, what it cost (or will cost) to fix, and how that relates to the amount the contractor is claiming.

If you already paid

Bank statements, transfer receipts, and cancelled cheques are definitive evidence of payment. Cross-reference every payment against the contractor's invoice schedule. If you paid A$4,000 of a A$6,000 invoice and the contractor is claiming the full A$6,000, your bank statements resolve the dispute in a sentence.

If there was no written contract

Many residential contractor disputes in WA involve verbal agreements. The absence of a written contract does not mean you have no defence — but it means the court will rely on other evidence to establish what was agreed: text messages, emails, a written quote (even if unsigned), witness statements from anyone present during the agreement, and the conduct of both parties. If the contractor quoted A$5,000 verbally and invoiced A$8,000 after "extras" were added without your agreement, your text messages discussing the original price can help show what you agreed to pay.

Filing Your Form 15A

Form 15A is the response document. Its five main response options are:

1. Full defence — you dispute the entire claim. This is the most common response in contractor disputes where you believe the work was defective, incomplete, or the invoice is inflated.
2. Partial defence — you accept part of the claim but dispute the rest. Use this if you agree you owe something but not the full amount (for example, you accept the materials cost but dispute the labour charge).
3. Admission with instalment offer — you agree you owe the money but cannot pay it all at once. This can resolve the matter without a hearing if the contractor accepts your offer.
4. Counterclaim — you have your own claim against the contractor. A request in Part I of Form 15A must be accompanied by Form 20A, which sets out the counterclaim's facts and amount. A Minor Case counterclaim cannot exceed A$10,000 unless all parties consent in writing; the originating claim fee applies, scaled by entity type.
5. Defence plus counterclaim — the hybrid option. You dispute the contractor's claim and file your own.

Part G also allows a request to change the court venue, supported by an affidavit.

File through the eCourts Portal WA. A standard Form 15A response has no court fee. Name your documents logically: 01-Form-15A-Response.pdf, 02-Original-Quote.pdf, 03-Photos-Incomplete-Work.pdf. The portal has file size limits and naming conventions. If you cannot use the portal, apply for a Form 69 exemption; if a registrar grants it, you can file at a registry counter or as otherwise directed.

Preparing for the Status Conference and Hearing

After you file your response, the court will schedule a status conference — a pre-trial meeting where the Magistrate explores whether the dispute can be settled. Come prepared with:

• A one-page written summary of your position (what happened, what you dispute, what outcome you want).
• Your walk-away number — the amount you would accept in settlement. Decide this before you arrive, not in the corridor under pressure.
• All your evidence, organised and indexed.

If settlement fails, the matter proceeds to a hearing. The hearing is conducted informally — no wigs, no cross-examination in the television sense. You present your evidence, the contractor presents theirs, the Magistrate asks questions, and a decision follows (sometimes immediately, sometimes in writing within a few weeks).

Who This Is For

• Homeowners served with a minor case claim by a contractor, builder, or tradesperson over an invoice under A$10,000.
• Defendants who have the documents — quotes, invoices, photographs, messages — and need a system for presenting them.
• Anyone who wants to understand the process before deciding whether to also seek one-off legal advice on the merits.

Who This Is NOT For

• Regulated building-work disputes, home building contract breaches, or remedy-order matters that fall within the Building Commissioner or SAT's statutory jurisdiction.
• Claims above A$10,000, which are outside the Minor Case track and may fall under General Procedure up to A$75,000.
• Defendants with disputes involving regulated building work, home building contract breaches, or remedy orders — seek legal advice about the Building Services (Complaint Resolution and Administration) Act 2011 (WA) and the Building Commissioner or SAT jurisdiction.
• Situations where the contractor threatens to lodge, or says it has lodged, a caveat over your property — seek specific advice about that separate property process.

Tradeoffs

Self-representing saves money but costs time. A solicitor for a defended contractor dispute runs A$2,000–$5,000. A standard Form 15A response has no court fee; a counterclaim has a fee, in addition to 6–10 hours of preparation. For a claim under A$5,000, the solicitor's fee can exceed the claim itself.

Your evidence does the talking. In a contractor dispute, the Magistrate considers the evidence — the contract, invoices, photographs, messages, and any witness evidence. A well-organised evidence bundle helps the Magistrate follow your case. A disorganised pile of papers makes that harder, whether prepared by you or a solicitor.

The outcome is proportional to preparation. Community forum posts from WA defendants consistently identify the same pattern: defendants who arrived with indexed documents and a written summary performed well. Defendants who arrived with a verbal story and loose papers did not.

Frequently Asked Questions

Can the contractor's solicitor appear against me in a minor case hearing?

Under section 30 of the Magistrates Court (Civil Proceedings) Act 2004 (WA), the court may grant leave if all parties agree. For a consumer/trader claim, it may also grant leave if no other party will be unfairly disadvantaged; for other minor cases, it may grant leave if representation is in the interests of justice. If the contractor's solicitor receives leave, you can apply separately for leave for your own solicitor too — but in most contractor disputes under A$10,000, both parties represent themselves.

What if the contractor added work I did not agree to and is now billing me for it?

This is a common defence in contractor disputes. Your position is that the extras were not part of the agreed scope and you did not authorise them. Evidence that supports this: the original quote or contract showing the agreed scope, the absence of any written variation agreement, and messages where the contractor mentioned the extras without your written approval.

Should I counterclaim for the cost of fixing the contractor's defective work?

If you paid another tradesperson to fix defects or complete unfinished work, keep the invoices and photographs as evidence of the amount. Whether that loss is recoverable depends on the facts and legal basis. To bring a counterclaim, set it out in Part I of Form 15A and include Form 20A, the Statement of Minor Case Counterclaim; the originating claim fee applies, scaled by entity type, and the counterclaim is limited to A$10,000 unless all parties consent in writing.

What if I cannot afford to pay the claimed amount even if I lose?

If you admit the claim, you can propose instalments in Part F of Form 15A. The contractor decides whether to accept the offer; if they reject it, they may proceed to enforce payment without further notice. If you dispute any part of the claim, you can defend that part rather than admitting it to seek instalments.

The Responding to a Minor Case Claim in Western Australia guide walks homeowners and other defendants through every step of the contractor-dispute response — from decoding the claim form to organising your evidence bundle for the hearing.

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