Subcontractor Payment Dispute: Letter of Demand or Security of Payment Claim?

You finished the job. The head contractor or builder owes you money. They are not paying.

Construction subcontractors in Australia have two main pathways to recover unpaid progress payments: send a letter of demand and pursue standard debt recovery, or lodge a Security of Payment claim under state building and construction legislation. The right choice depends on your contract type, how quickly you need the money, and whether you can navigate a statutory adjudication process.

What is a subcontractor payment dispute?

A subcontractor payment dispute arises when you completed construction work under contract, invoiced for payment, and the head contractor, builder, or principal has not paid within the agreed timeframe.

Common scenarios:

• Progress claims rejected without valid reasons
• Payment withheld pending defect rectification (real or alleged)
• Head contractor citing cash flow issues or disputes with the principal
• Retention amounts not released after practical completion
• Variations completed but not approved or paid

In construction, payment disputes threaten business viability. Subcontractors operate on thin margins and cannot afford prolonged non-payment.

Standard debt recovery: letter of demand

The traditional pathway is to send a letter of demand citing the contract, the invoice, and the amount owed.

How it works:

1. Send a formal letter of demand giving the debtor 7–14 days to pay
2. Reference the contract, invoice date, amount owing, and applicable law
3. If they do not pay, escalate to tribunal or court proceedings
4. Obtain a judgment, then enforce it via garnishee, bailiff, or wind-up proceedings

Advantages:

• Works for any contract type (written, oral, or implied)
• No strict procedural requirements
• Can claim interest and debt recovery expenses
• Applies across all industries, not just construction

Disadvantages:

• Slow — tribunal or court proceedings typically take months
• The debtor can dispute the claim and delay the process
• You bear the cost and risk of litigation
• No fast-track adjudication mechanism

A letter of demand is appropriate when the contract is not a “construction contract” under Security of Payment legislation, the amount is small and tribunal proceedings are cost-effective, or you want a final determination rather than an interim adjudication.

Security of Payment Act: the fast-track alternative

Every Australian state and territory has Security of Payment legislation designed specifically for the construction industry. The legislation provides a statutory right to progress payments and a fast adjudication process.

Legislation by state:

• NSW: Building and Construction Industry Security of Payment Act 1999
• VIC: Building and Construction Industry Security of Payment Act 2002
• QLD: Building Industry Fairness (Security of Payment) Act 2017
• WA: Construction Contracts Act 2004
• SA: Building and Construction Industry Security of Payment Act 2009
• TAS: Building and Construction Industry (Security of Payment) Act 2009
• ACT: Building and Construction Industry (Security of Payment) Act 2009
• NT: Construction Contracts (Security of Payments) Act 2004

How it works:

1. Serve a payment claim on the head contractor (must comply with the Act’s formal requirements)
2. The respondent typically has 10–15 business days to serve a payment schedule (varies by state)
3. If no payment schedule is served, the amount becomes a debt due and payable immediately
4. If a payment schedule disputes the claim, you can apply for adjudication within the statutory timeframe
5. An adjudicator is appointed and typically delivers a determination within 10–15 business days
6. The determination is binding and immediately enforceable as a judgment debt

Advantages:

• Fast — adjudication typically completed within 30–45 days from payment claim to determination
• Lower upfront cost — adjudication fees are often split or borne by the losing party; no court filing fees
• Interim binding — the determination is enforceable immediately (subject to later review in court or arbitration)
• “Pay now, argue later” — the respondent must pay the adjudicated amount even if they dispute it

Disadvantages:

• Strict procedural requirements — missing a deadline or failing to comply with the Act can be fatal
• Only applies to “construction contracts” (not all building-related work qualifies)
• The determination is interim — the respondent can later sue to recover overpayments
• You must act quickly — payment claims must be served within the timeframes specified in the contract or the Act
• May not cover final account disputes in some states

Key differences: letter of demand vs Security of Payment claim

| Factor | Letter of Demand | Security of Payment Claim | |——–|——————|—————————| | Speed | Months (tribunal/court) | 30–45 days (adjudication) | | Cost | Tribunal filing fees + legal costs | Adjudication fees (typically $3,000–$10,000 split) | | Scope | Any debt | Construction contracts only | | Formality | Flexible | Strict statutory requirements | | Enforcement | Judgment debt (after court) | Immediately enforceable determination | | Finality | Final judgment | Interim determination (subject to later review) | | Risk | Debtor can defend and delay | Debtor must pay first, dispute later |

When to use a letter of demand

Choose a standard letter of demand when:

• Your contract is not a construction contract under the Security of Payment Act (e.g. design-only services, consultancy, materials supply without installation)
• The payment claim deadline under the Act has passed
• The amount is small and tribunal proceedings are cost-effective
• You want a final determination, not an interim adjudication
• You are claiming retention amounts released after final completion (some states exclude these from Security of Payment)

When to use a Security of Payment claim

Lodge a Security of Payment claim when:

• You are a subcontractor, sub-subcontractor, or supplier carrying out construction work
• The contract is a “construction contract” under your state’s Act
• You are claiming a progress payment (not a final account in some jurisdictions)
• You need money fast and cannot afford to wait months for a tribunal hearing
• The head contractor has a history of disputing claims without merit
• You can comply with strict procedural and timing requirements

Common mistakes subcontractors make

Missing the payment claim deadline

Most states require payment claims to be served within the timeframe specified in the contract, or within a set period of the work being completed. Missing this deadline means you lose the statutory right to adjudication.

Serving a non-compliant payment claim

The payment claim typically must be in writing, identify the construction work, state the amount claimed, and be described as a “payment claim” (requirements vary by state). A defective payment claim can be rejected, and you may not get a second chance within the statutory timeframe.

Failing to respond to a payment schedule

If the respondent serves a payment schedule disputing your claim, you must apply for adjudication within the statutory timeframe (typically 10–20 business days). Missing this deadline means you cannot adjudicate the claim.

Using the wrong pathway

Sending a letter of demand when you should have lodged a Security of Payment claim (or vice versa) wastes time and money.

How ClaimDone helps with subcontractor payment disputes

ClaimDone prepares letters of demand for subcontractors owed money under construction contracts. You complete a short intake form, upload your contract and invoices, and our Proprietary AI Engine drafts a professionally formatted letter citing the applicable law.

The letter is sent automatically to the debtor, giving them a clear deadline to pay before you escalate to tribunal or court proceedings.

What ClaimDone does:

• Drafts a letter of demand referencing your contract, invoice, and the amount owed
• Cites relevant Australian contract law principles
• Delivers the letter via email and registered post
• Provides you with a PDF copy for your records

What ClaimDone does not do:

• Lodge Security of Payment claims or adjudication applications (these require strict statutory compliance and are best handled by a construction lawyer or specialist consultant)
• Represent you in adjudication or tribunal proceedings

For Security of Payment claims, engage a construction lawyer or specialist adjudication consultant who understands the procedural requirements in your state.

For a standard letter of demand to recover an unpaid construction debt, ClaimDone delivers a fast, fixed-fee solution.

When to get legal advice

Speak to a construction lawyer if:

• The amount owed exceeds $20,000
• The contract is complex or involves multiple parties
• You are unsure whether your contract qualifies under the Security of Payment Act
• The head contractor is insolvent or at risk of insolvency
• You have already lodged a payment claim and need help with the adjudication application
• The dispute involves defects, variations, or set-off claims

A lawyer can assess your contract, advise on the best pathway, and handle the adjudication or tribunal proceedings.

Choose the right pathway and act quickly

A letter of demand is the right choice for standard debt recovery when the Security of Payment Act does not apply, or when you want a final determination through tribunal or court proceedings.

A Security of Payment claim is the fast-track option when you need money urgently, the contract qualifies, and you can comply with strict statutory requirements.

The longer you delay, the harder it becomes to recover the debt. Choose the pathway that matches your contract, your timeline, and your risk tolerance.

Get your letter of demand prepared today

ClaimDone prepares letters of demand for subcontractors owed money under construction contracts. Complete a 5-minute intake form, upload your evidence, and we will draft and send your letter within 60 minutes. Flat fee. No subscription. Australia-wide.

Start your AI-generated letter of demand now.

Frequently Asked Questions

Can I use a letter of demand for a construction payment dispute?

Yes. A letter of demand works for any unpaid construction debt. However, if your contract qualifies under the Security of Payment Act and you want a faster resolution, a statutory payment claim and adjudication may be more effective.

What is the difference between a payment claim and a letter of demand?

A payment claim is a statutory document served under Security of Payment legislation, triggering a fast adjudication process. A letter of demand is a standard debt recovery tool that can lead to tribunal or court proceedings if the debtor does not pay.

How long does Security of Payment adjudication take?

Typically 30–45 days from serving the payment claim to receiving the adjudicator’s determination. The determination is immediately enforceable as a judgment debt.

What happens if I miss the payment claim deadline?

You lose the statutory right to adjudication under the Security of Payment Act. You can still pursue the debt through a standard letter of demand and tribunal or court proceedings, but you will not have access to the fast-track adjudication process.

Does ClaimDone prepare Security of Payment claims?

No. Security of Payment claims require strict statutory compliance and are best handled by a construction lawyer or specialist consultant. ClaimDone prepares standard letters of demand for construction debts.