Contractor Wants More Money Mid-Job: What Are Your Legal Rights?

You agreed on a price. Work started. Now the contractor says they need more money to finish the job.

The answer depends on what your contract says, what’s actually changed, and whether the contractor is claiming a legitimate variation or trying to renegotiate a fixed price.

When a Contractor Can Legitimately Ask for More Money

Not every mid-job price increase is a breach. Some changes genuinely warrant additional payment.

Valid reasons for a variation claim:

• You changed the scope — you asked for different materials, additional work, or alterations to the original plan
• Unforeseen site conditions — hidden structural issues, asbestos, or ground conditions that could not reasonably have been discovered during quoting
• Provisional sum items — the contract included estimates for certain work, and the actual cost differs
• Prime cost (PC) items — you selected fixtures or fittings above the allowance specified in the contract
• Written variation clause triggered — the contract allows variations, and the contractor followed the correct process

If the contract includes a variation clause, the contractor typically must give you written notice and a quote before doing the extra work. If they skip this process, they may not be entitled to payment.

When It’s Breach of Contract

If the contractor simply decided they quoted too low, that is not your problem. A fixed-price contract means the price is fixed.

Red flags that indicate breach:

• No scope change — the contractor wants more money to complete the original agreed work
• Verbal-only variation — they claim you agreed to changes, but nothing was documented
• Threatening to walk off — holding the job hostage unless you pay more
• Inflated variation claims — charging far more than the actual cost of any change
• Abandoning the contract — stopping work mid-job without lawful excuse

If a contractor refuses to complete agreed work at the agreed price without a valid variation, they are in breach. You do not have to pay extra just because they underquoted or encountered normal trade difficulties.

What Your Contract Should Say

Most disputes arise because the original contract was vague, verbal, or missing key terms. A proper written contract should include:

• Fixed price or schedule of rates — clear pricing structure
• Scope of work — detailed description of what is included
• Variation clause — how changes must be requested, quoted, and approved
• Payment milestones — when payments are due, tied to completed stages
• Completion date — timeframe for finishing the work
• Dispute resolution — how disagreements will be handled

If you don’t have a written contract, the terms are still enforceable, but proving what was agreed becomes much harder. Text messages, emails, and quotes can all form part of the contract.

How to Handle a Mid-Job Demand for More Money

When a contractor asks for extra payment, do not ignore it and do not immediately agree.

Step 1: Request it in writing

Ask the contractor to provide a written variation claim detailing:

• What has changed from the original scope
• Why the change justifies extra payment
• How much they are claiming
• What work the extra payment covers

Step 2: Review your contract

Check whether:

• The contract allows variations
• The contractor followed the required process
• The claim relates to work you requested or approved
• The amount is reasonable

Step 3: Respond formally

If the claim is invalid, send a written response rejecting it and referring to the original contract terms. If the claim has merit but the amount is inflated, negotiate in writing.

Step 4: Issue a Notice to Remedy Breach

If the contractor refuses to continue without unjustified extra payment, or threatens to abandon the job, you can issue a formal notice requiring them to comply with the contract. This gives them a final opportunity to remedy the breach before you terminate and claim damages.

Notice to Remedy Breach: Your Legal Tool Against Scope Creep

A Notice to Remedy Breach is the formal way to tell a contractor they are not complying with the contract and must fix it.

When to use it:

• Contractor demands payment for work already included in the agreed scope
• Contractor stops work without lawful excuse
• Contractor fails to follow the variation process in the contract
• Contractor threatens to walk off unless you pay an unjustified amount

What it does:

• Puts the contractor on formal notice of the breach
• Sets a deadline to remedy (typically 7-14 days)
• Preserves your right to terminate and claim damages if they don’t comply
• Creates a paper trail if the dispute escalates to tribunal or court

The notice must specify exactly what the breach is, refer to the relevant contract clause, and state what the contractor must do to fix it.

What Happens If the Contractor Walks Off

If a contractor abandons a job without lawful excuse, you can:

• Engage another contractor to complete the work — you are entitled to recover any extra cost from the original contractor
• Claim damages — including the cost of rectifying defective work, storage, accommodation if you cannot occupy the property, and consequential losses
• Lodge a tribunal claim — most building disputes under $25,000 (varies by state) can be resolved in the relevant civil tribunal without needing a lawyer
• Report to the regulator — if the contractor is licensed, report the conduct to the state building regulator

Do not withhold payment for completed work just because the contractor walked off. You can only withhold amounts genuinely in dispute or offset against your damages claim.

Protecting Yourself From the Start

The best defence against mid-job price hikes is a clear written contract before work begins.

What to include:

• Detailed scope — list every task, material, and finish
• Fixed price or transparent rates — no room for surprise charges
• Variation process — how changes must be requested and approved in writing
• Payment schedule — tied to milestones, not just dates
• Retention clause — hold back 5-10% until final completion and defects rectified

Get at least three quotes. If one is significantly lower, ask why. A contractor who underquotes to win the job will often try to claw back profit through variations.

How Claim Done Helps

When a contractor tries to renegotiate a fixed price or refuses to finish without unjustified extra payment, you need a formal response that shows you know your rights.

Claim Done’s Notice to Remedy Breach service generates a legally precise notice citing the relevant contract terms. You tell us about your contract and describe the breach. Our Programmatic Algorithms draft the notice for you to check and approve before it is sent.

What you get:

• Professionally formatted notice as a PDF
• Citation of the specific contract clause breached
• Clear deadline for the contractor to remedy
• Preservation of your right to terminate and claim damages
• Prepared in about 5 minutes for a flat fee

If the contractor still refuses to comply, the notice becomes evidence in your tribunal claim, showing you gave them a fair opportunity to fix the breach.

Final Takeaway

A contractor asking for more money mid-job is not automatically wrong, but they must have a valid reason under the contract. If the scope genuinely changed and the contract allows variations, you may owe extra. If they simply underquoted or want to renegotiate a fixed price, you do not.

Put everything in writing. Follow the contract. If the contractor breaches, issue a formal notice.

Stop Scope Creep With a Notice to Remedy Breach

If a contractor is demanding unjustified extra payment or threatening to abandon your job, a formal Notice to Remedy Breach brings them back into line and protects your position if the dispute escalates.

Claim Done prepares your notice in about 5 minutes, citing the contract terms, for a flat fee. Tell us about your contract, describe the breach, and get a professionally formatted notice for you to check and approve before it is sent.

Prepare My Notice to Remedy Breach →

Frequently Asked Questions

Can a contractor increase the price after quoting?

Only if the contract allows variations and the scope of work has genuinely changed. A contractor cannot simply increase the price because they quoted too low or the job is harder than expected. If the contract is fixed-price and the scope has not changed, the original price stands.

What is a valid variation under Australian contract law?

A valid variation is a change to the agreed scope of work that justifies additional payment. This includes changes you request, unforeseen site conditions that could not reasonably have been discovered, or provisional/PC items where actual costs differ from estimates. The contractor typically must provide written notice and a quote before doing the extra work.

What can I do if a contractor walks off mid-job?

If a contractor abandons the job without lawful excuse, you can engage another contractor to complete the work and claim the extra cost as damages. You can also lodge a tribunal claim for the cost of rectifying defects and consequential losses, and report the contractor to the state building regulator if they are licensed.

Do I have to pay for variations I didn't approve in writing?

Not necessarily. If your contract requires variations to be approved in writing and the contractor did not follow that process, you may not be obliged to pay. However, if you clearly requested the extra work or accepted the benefit of it, a court or tribunal may find an implied agreement. Always document variation requests and approvals.

How do I prove the original scope if I don't have a written contract?

Use any available evidence: quotes, emails, text messages, photos, invoices, and witness statements from anyone present during negotiations. Even without a formal contract, these documents can establish what was agreed. The more detailed your records, the stronger your position in a dispute.