Subcontractor's Claim for Confirmation of Non-Existence of Debt Dismissed — Overpaid Construction Fees Recovered as Unjust Enrichment
Case Type : Subcontract Construction Fee Dispute · Counterclaim for Unjust Enrichment
Outcome : Plaintiff's Main Claim Dismissed · Client's Counterclaim Upheld in Full
Handled by : Law Firm Jinheon
Case at a Glance
Our client, a general contractor engaged to carry out a park construction project awarded by a local government authority, subcontracted a portion of the works to the plaintiff. The subcontractor failed to complete works commensurate with the progress payments already received, leaving our client having overpaid for work that was never done. When our client terminated the subcontract and sought repayment, the subcontractor got in first — filing a lawsuit seeking a court declaration that no debt existed. Law Firm Jinheon identified that an expert valuation of the completed works was no longer possible, pivoted to the official completion settlement records certified by the local government authority and the subcontractor direct payment system, used those materials to precisely quantify the overpayment, and filed a counterclaim — securing dismissal of the main claim and full recovery of the overpaid amount.
1. Why the Client Came to Law Firm Jinheon
Our client was a construction company that had been awarded a park development project by a local government authority. A portion of the works was subcontracted to the plaintiff, with progress payments released as the works advanced. When the project reached completion and final accounts were drawn up, a serious problem came to light: the subcontractor had not performed work commensurate with the progress payments it had already received. Our client had overpaid — disbursing more than the value of works actually completed.
Our client terminated the subcontract and demanded repayment of the excess. The subcontractor responded by filing a pre-emptive lawsuit against our client, seeking a court declaration that no debt existed — an attempt to have it confirmed by the court, before our client could take action, that there was nothing to repay. Our client came to Law Firm Jinheon to respond.
2. Law Firm Jinheon's Legal Strategy
The greatest obstacle in this case was that the construction works had already been completed. In construction disputes, the standard method of establishing the actual volume and value of works performed is through a court-appointed expert valuation. But once a site has been finished and handed over, a meaningful expert valuation is often no longer possible. We had to prove the overpayment without one.
Law Firm Jinheon identified a critical feature of this case: the project had been awarded by a local government authority. Unlike private construction projects, public authority contracts generate a body of official documentation — reviewed, verified, and certified by the authority itself — through the completion settlement process. This was the key.
We structured our evidentiary strategy around three steps.
First, we collected and analysed the completion settlement records certified by the local government authority. Using the total works volume and value as officially confirmed by the authority, we identified the specific scope of works the subcontractor had actually performed and calculated the precise amount of the overpayment in concrete figures.
Second, we drew on records from the subcontractor direct payment system. This system maintained a detailed record of all payments made to the subcontractor. By cross-referencing those payment records against the certified completion data, we established the gap between what had been paid and what had actually been delivered — in objective, documented terms.
Third, armed with a precisely quantified overpayment figure, we filed a counterclaim for unjust enrichment. Rather than simply defending against the subcontractor's claim, we went on the offensive — actively claiming back the money our client was owed.
3. The Outcome — Main Claim Dismissed, Counterclaim Upheld in Full
The court dismissed the subcontractor's main claim. The argument that no debt existed was rejected entirely.
The court then upheld our client's counterclaim, ordering the subcontractor to return the excess payments received as unjust enrichment. The party that had filed the pre-emptive lawsuit ended up being ordered to pay money back.
4. Why This Case Matters — And Why Choose Law Firm Jinheon
In construction litigation, proving the volume and value of works performed without an expert valuation is one of the hardest challenges a legal team can face. When valuation is no longer possible, many cases stall — or clients are forced to accept an unfavourable outcome simply because the evidence cannot be assembled.
Law Firm Jinheon found a different path. Recognising that this was a public authority contract, we identified that objective, officially certified documentation existed that could serve as a substitute for expert valuation — and built our entire evidentiary strategy around it. The outcome of this case turned entirely on knowing which evidence to look for, how to obtain it, and how to present it to the court.
Construction disputes involving subcontract fee disagreements, progress payment discrepancies, and unjust enrichment claims are won or lost on evidence. Law Firm Jinheon understands the specific characteristics of each case, locates the most effective evidence available, and presents it in a way that persuades the court.
Subcontractor's Claim for Confirmation of Non-Existence of Debt Dismissed — Overpaid Construction Fees Recovered as Unjust Enrichment
Case Type : Subcontract Construction Fee Dispute · Counterclaim for Unjust Enrichment Outcome : Plaintiff's Main Claim Dismissed · Client's Counterclaim Upheld in Full Handled by : Law Firm Jinheon
Case at a Glance
Our client, a general contractor engaged to carry out a park construction project awarded by a local government authority, subcontracted a portion of the works to the plaintiff. The subcontractor failed to complete works commensurate with the progress payments already received, leaving our client having overpaid for work that was never done. When our client terminated the subcontract and sought repayment, the subcontractor got in first — filing a lawsuit seeking a court declaration that no debt existed. Law Firm Jinheon identified that an expert valuation of the completed works was no longer possible, pivoted to the official completion settlement records certified by the local government authority and the subcontractor direct payment system, used those materials to precisely quantify the overpayment, and filed a counterclaim — securing dismissal of the main claim and full recovery of the overpaid amount.
1. Why the Client Came to Law Firm Jinheon
Our client was a construction company that had been awarded a park development project by a local government authority. A portion of the works was subcontracted to the plaintiff, with progress payments released as the works advanced. When the project reached completion and final accounts were drawn up, a serious problem came to light: the subcontractor had not performed work commensurate with the progress payments it had already received. Our client had overpaid — disbursing more than the value of works actually completed.
Our client terminated the subcontract and demanded repayment of the excess. The subcontractor responded by filing a pre-emptive lawsuit against our client, seeking a court declaration that no debt existed — an attempt to have it confirmed by the court, before our client could take action, that there was nothing to repay. Our client came to Law Firm Jinheon to respond.
2. Law Firm Jinheon's Legal Strategy
The greatest obstacle in this case was that the construction works had already been completed. In construction disputes, the standard method of establishing the actual volume and value of works performed is through a court-appointed expert valuation. But once a site has been finished and handed over, a meaningful expert valuation is often no longer possible. We had to prove the overpayment without one.
Law Firm Jinheon identified a critical feature of this case: the project had been awarded by a local government authority. Unlike private construction projects, public authority contracts generate a body of official documentation — reviewed, verified, and certified by the authority itself — through the completion settlement process. This was the key.
We structured our evidentiary strategy around three steps.
First, we collected and analysed the completion settlement records certified by the local government authority. Using the total works volume and value as officially confirmed by the authority, we identified the specific scope of works the subcontractor had actually performed and calculated the precise amount of the overpayment in concrete figures.
Second, we drew on records from the subcontractor direct payment system. This system maintained a detailed record of all payments made to the subcontractor. By cross-referencing those payment records against the certified completion data, we established the gap between what had been paid and what had actually been delivered — in objective, documented terms.
Third, armed with a precisely quantified overpayment figure, we filed a counterclaim for unjust enrichment. Rather than simply defending against the subcontractor's claim, we went on the offensive — actively claiming back the money our client was owed.
3. The Outcome — Main Claim Dismissed, Counterclaim Upheld in Full
The court dismissed the subcontractor's main claim. The argument that no debt existed was rejected entirely.
The court then upheld our client's counterclaim, ordering the subcontractor to return the excess payments received as unjust enrichment. The party that had filed the pre-emptive lawsuit ended up being ordered to pay money back.
4. Why This Case Matters — And Why Choose Law Firm Jinheon
In construction litigation, proving the volume and value of works performed without an expert valuation is one of the hardest challenges a legal team can face. When valuation is no longer possible, many cases stall — or clients are forced to accept an unfavourable outcome simply because the evidence cannot be assembled.
Law Firm Jinheon found a different path. Recognising that this was a public authority contract, we identified that objective, officially certified documentation existed that could serve as a substitute for expert valuation — and built our entire evidentiary strategy around it. The outcome of this case turned entirely on knowing which evidence to look for, how to obtain it, and how to present it to the court.
Construction disputes involving subcontract fee disagreements, progress payment discrepancies, and unjust enrichment claims are won or lost on evidence. Law Firm Jinheon understands the specific characteristics of each case, locates the most effective evidence available, and presents it in a way that persuades the court.