DIAMOND GLASS ENTERPRISE PTE. LTD. v ZHONG KAI CONSTRUCTION COMPANY PTE. LTD.

Case Details

• Citation: [2021] SGHC 277
• Court: General Division of the High Court
• Decision Date: 02 December 2021
• Coram: Kwek Mean Luck JC
• Case Number: Suit No 1282 of 2019 (consolidated with S 917)
• Hearing Date(s): 29, 30 June, 1, 2, 6–8, 13, 14, 16, 19 July, 11 November 2021
• Claimants / Plaintiffs: Zhong Kai Construction Co Pte Ltd
• Respondent / Defendant: Diamond Glass Enterprise Pte Ltd
• Counsel for Claimants: Kris Chew Yee Fong, Su Hongling Isabel (Zenith Law Corporation)
• Counsel for Respondent: Luo Ling Ling, Sharifah Nabilah binte Syed Omar (Luo Ling Ling LLC)
• Practice Areas: Building and Construction Law; Damages; Liquidated damages

Summary

The judgment in Zhong Kai Construction Co Pte Ltd v Diamond Glass Enterprise Pte Ltd [2021] SGHC 277 represents a significant High Court determination concerning the enforceability of liquidated damages ("LD") clauses and the evidentiary standards required for replacement and rectification claims in the construction sector. The dispute arose from a subcontract for aluminium cladding and window works at a project involving Changi Airport. The primary issues revolved around whether the plaintiff, Zhong Kai Construction Co Pte Ltd ("Zhong Kai"), was entitled to LD for delays caused by the defendant, Diamond Glass Enterprise Pte Ltd ("Diamond Glass"), and whether the LD clause in the subcontract constituted an unenforceable penalty under the principles recently clarified by the Court of Appeal.

Kwek Mean Luck JC, presiding, was tasked with navigating a complex factual matrix involving allegations of site abandonment, defective works, and disputed variation orders ("VOs"). A central doctrinal contribution of this case is the court's application of the "genuine pre-estimate of loss" test as articulated in Denka Advantech Pte Ltd and another v Seraya Energy Pte Ltd and another and other appeals [2021] 1 SLR 631. The court held that the LD quantum stipulated in the subcontract was not extravagant or unconscionable, thereby affirming its status as a valid liquidated damages provision rather than a penalty. This reinforces the Singapore courts' commitment to upholding freedom of contract in commercial construction arrangements, provided the stipulated sums are not demonstrably punitive.

Furthermore, the judgment provides critical guidance on the admissibility of business records under the Evidence Act. Zhong Kai sought to recover $197,501.49 for replacement and rectification works, relying on third-party invoices. The court's acceptance of these invoices under the Section 32(1)(b) exception—as documents made in the ordinary course of business—highlights a pragmatic approach to proving quantum in construction litigation where the original makers of invoices may not be available to testify. The decision also addressed the intersection between civil litigation and the Building and Construction Industry Security of Payment Act ("SOPA"), specifically regarding the finality of adjudication determinations and the recovery of adjudication costs.

Ultimately, the court allowed Zhong Kai's claims for LD in the amount of $356,400 and replacement costs of $197,501.49, while overturning several variation orders previously allowed in an adjudication determination. The judgment serves as a comprehensive manual for practitioners on the necessity of precise pleading, the rigorous standards for proving delay, and the high threshold required to strike down an LD clause as a penalty in the Singapore jurisdiction.

Timeline of Events

1. 16 June 2016: Earliest date referenced in the project context regarding preliminary arrangements.
2. 07 November 2016: Zhong Kai (Plaintiff) engages Diamond Glass (Defendant) as a subcontractor via a Letter of Award (the "Subcontract") for the supply of materials and tools for aluminium cladding and window works.
3. 15 February 2017: Key date in the early phase of the subcontract works.
4. 20 February 2017: Commencement of specific work tranches as per the project schedule.
5. 17 March 2017: Progress milestone for facade and window installations.
6. 04 April 2017: Issuance of project instructions regarding material supply.
7. 08 May 2017: Further project instructions and site coordination meetings.
8. 15 July 2017: Deadline for specific Phase 1 deliverables under the Subcontract.
9. 31 July 2017: Significant date for the assessment of progress and potential delays.
10. 11 September 2017: Communication regarding defects in the aluminium cladding works.
11. 13 September 2017: Formal notice of delay issued by Zhong Kai to Diamond Glass.
12. 29 December 2017: End of the 2017 work cycle; assessment of uncompleted works.
13. 16 March 2018: Milestone for Phase 2 works and ballistic door installations.
14. 17 April 2018: Notice of intention to engage third-party contractors for rectification.
15. 06 June 2018: Diamond Glass allegedly abandons the worksite, leading to the cessation of their performance under the Subcontract.
16. 28 August 2019: Commencement of legal proceedings via Writ of Summons in Suit No 1282 of 2019.
17. 15 November 2019: Filing of the Statement of Claim by Zhong Kai.
18. 17 January 2020: Filing of the Defence and Counterclaim by Diamond Glass.
19. 29 June 2021: Commencement of the substantive hearing before Kwek Mean Luck JC.
20. 11 November 2021: Conclusion of the substantive hearing.
21. 02 December 2021: Delivery of the judgment by the General Division of the High Court.

What Were the Facts of This Case?

The plaintiff, Zhong Kai Construction Co Pte Ltd, is a Singapore-incorporated company operating within the building and construction industry. By a letter dated 7 November 2016, Zhong Kai entered into a Subcontract with the defendant, Diamond Glass Enterprise Pte Ltd. Under this agreement, Diamond Glass was appointed as a subcontractor responsible for the supply of materials, equipment, and tools necessary to carry out and complete the aluminium cladding of the external facade, blast/ballistic doors and windows, aluminium doors, and general window works for a specific project at Singapore Changi Airport. The Subcontract was a fixed-price arrangement, incorporating specific clauses (Clauses 4, 6, and 12.2) that governed the timeline for completion and the consequences of delay.

The project was divided into phases, with Phase 1 and Phase 2 having distinct completion dates. Clause 6 of the Subcontract was particularly critical, as it stipulated the liquidated damages ("LD") rate applicable in the event of a failure to meet the completion deadlines. As the project progressed, Zhong Kai alleged that Diamond Glass failed to maintain the required progress, leading to significant delays in the installation of the facade and the ballistic doors. Diamond Glass, conversely, contended that any delays were caused by Zhong Kai's failure to provide site access or by variations that expanded the scope of work beyond the original agreement.

The relationship between the parties deteriorated significantly in mid-2018. Zhong Kai asserted that on 6 June 2018, Diamond Glass abandoned the worksite, leaving a substantial portion of the subcontract works uncompleted and several installed elements defective. Following this abandonment, Zhong Kai was forced to engage third-party contractors to carry out replacement and rectification works. The costs incurred for these third-party interventions formed a major head of claim in the subsequent litigation, totaling $197,501.49. Diamond Glass denied abandonment, arguing instead that the contract had been frustrated or that Zhong Kai's actions amounted to a repudiatory breach that justified their cessation of work.

Prior to the High Court suit, the parties were involved in statutory adjudication under the Building and Construction Industry Security of Payment Act (Cap 30B, 2006 Rev Ed) ("SOPA"). In Adjudication Determination No 339 of 2019 ("AA 339"), Diamond Glass was awarded certain sums for variation orders (VOs). Zhong Kai subsequently initiated Suit No 1282 of 2019 to challenge these findings and to claim for LD and rectification costs. The suit was consolidated with S 917, creating a comprehensive litigation framework to resolve all outstanding contractual disputes. The evidence presented at trial included extensive testimony from Lu Zhi (whose AEIC was dated 5 May 2021) and various project managers, alongside a voluminous record of site diaries, invoices, and correspondence.

The factual dispute also touched upon the technical specifications of the materials. The Subcontract required the supply of specialized blast and ballistic resistant glass and aluminium frames. Zhong Kai alleged that the materials supplied by Diamond Glass did not meet the project's stringent safety standards, necessitating total replacement in certain sections. Diamond Glass countered that the materials were compliant with the specifications provided at the time of the 7 November 2016 letter and that any subsequent changes in requirements constituted variation orders for which they were entitled to additional payment. This factual tension between "contractual scope" and "variation" was a recurring theme throughout the 108-page judgment.

What Were the Key Legal Issues?

The court was required to resolve several complex legal issues that sit at the heart of construction law and the general law of contract. These issues were framed not only by the terms of the Subcontract but also by the statutory framework of SOPA and the evidentiary rules of the Evidence Act.

• The Validity and Enforceability of the Liquidated Damages Clause: The primary legal question was whether Clause 6 of the Subcontract was a valid LD clause or an unenforceable penalty. This required the court to apply the test from Denka Advantech to determine if the stipulated sum was a "genuine pre-estimate of loss" or "extravagant and unconscionable."
• The Interpretation of Completion Dates: The parties disagreed on whether the dates mentioned in Clause 6 were intended to be "hard" deadlines for the purposes of LD or merely indicative milestones. This involved the application of the contra proferentem rule and general principles of contractual interpretation.
• Entitlement to Replacement and Rectification Costs: Zhong Kai claimed $197,501.49 for works done by third parties. The legal issue was whether Zhong Kai had sufficiently proven these losses and whether they had fulfilled their duty to mitigate loss, as required by the principles in The "Asia Star" [2010] 2 SLR 1154.
• Admissibility of Invoices under the Evidence Act: A significant procedural and substantive issue was whether third-party invoices could be admitted into evidence without calling the makers of those invoices, specifically under the Section 32(1)(b) exception for business records.
• The Finality of Adjudication Determinations: The court had to decide to what extent it could overturn findings made in a SOPA adjudication (AA 339) regarding variation orders, and whether the costs of such adjudication could be recovered as damages in a civil suit under Section 30(4) of SOPA.

Each of these issues carried significant weight. The LD issue, in particular, required the court to balance the principle of pacta sunt servanda (agreements must be kept) against the equitable doctrine against penalties. The evidentiary issue regarding invoices was crucial for the practicalities of construction litigation, where the chain of subcontractors often makes it difficult to produce every individual who generated a billing document. Finally, the SOPA issue addressed the "temporary finality" of adjudication and the boundaries of the court's power to re-open those determinations in a full trial.

How Did the Court Analyse the Issues?

The court’s analysis began with the Liquidated Damages (LD) claim. Zhong Kai sought LD for Phase 1 and Phase 2 delays. The court first addressed the threshold question of whether Clause 6 of the Subcontract was a penalty. Relying on the Court of Appeal's decision in Denka Advantech Pte Ltd and another v Seraya Energy Pte Ltd and another and other appeals [2021] 1 SLR 631, Kwek Mean Luck JC noted that a clause is a penalty if the sum stipulated is "extravagant and unconscionable in comparison with the greatest loss that could conceivably be proved to have followed from the breach" (at [95], citing Denka Advantech at [254]).

The court examined the specific quantum in Clause 6. Diamond Glass argued that the LD was a penalty because it was not based on any actual calculation of loss at the time of contracting. However, the court held that the lack of a detailed contemporaneous calculation does not automatically render a clause a penalty. The focus is on whether the sum is "extravagant." The court found that the LD quantum was a "genuine pre-estimate of loss" (at [102]). In reaching this conclusion, the court considered the nature of the project—a high-security airport facility—where delays would inevitably lead to cascading costs for the main contractor, including potential LD claims from the employer and increased site overheads. The court rejected the contra proferentem argument raised by Diamond Glass, citing Hewlett-Packard Singapore (Sales) Pte Ltd v Chin Shu Hwa Corinna [2016] 2 SLR 1083, noting that the rule only applies in cases of genuine ambiguity, which was not present here as the completion dates were clearly defined.

Regarding the Replacement and Rectification Works, the court analyzed Zhong Kai's claim for $197,501.49. A key hurdle for Zhong Kai was the admissibility of the invoices from third-party contractors. Diamond Glass objected to these invoices on the basis that they were hearsay. The court applied Section 32(1)(b) of the Evidence Act (Cap 97, 1997 Rev Ed), which allows for the admission of statements made in the ordinary course of business. The court found that the invoices fell within this exception, as they were standard commercial documents generated during the rectification process (at [103]).

On the issue of Mitigation of Loss, the court referred to The "Asia Star" [2010] 2 SLR 1154. Diamond Glass argued that Zhong Kai had failed to mitigate its losses by not seeking the most competitive quotes for the replacement works. The court, however, found that Zhong Kai had acted reasonably in the circumstances. Given the abandonment of the site by Diamond Glass on 6 June 2018, Zhong Kai was under pressure to complete the works to avoid further LD from the project employer. The court noted that the duty to mitigate does not require a plaintiff to take every possible step, but only those that are reasonable in the ordinary course of business. The court accepted that the quotes obtained by Zhong Kai were within a reasonable range for the specialized nature of the cladding and ballistic window works.

The court then turned to the Variation Orders (VOs). This involved a detailed review of the Adjudication Determination (AD) in AA 339. The court emphasized that while an AD is binding for the purposes of payment under SOPA, it does not prevent the court from making a final determination on the merits in a civil suit. The court cited Jia Min Building Construction Pte Ltd v Ann Lee Pte Ltd [2004] 3 SLR(R) 288, which established that a subcontractor has no general right to be paid for variations unless they were properly authorized under the contract. The court found that three of the VOs allowed in the AD were not supported by sufficient evidence of authorization or were already within the original scope of the Subcontract. Consequently, the court overturned these findings.

Finally, the court addressed the Costs of Adjudication. Zhong Kai sought to recover the costs it incurred during the SOPA adjudication process. The court referred to Section 30(4) of the SOPA, which states that a party to an adjudication shall bear all other costs and expenses incurred as a result of or in relation to the adjudication. Following the reasoning in GA Engineering Pte Ltd v Sun Moon Construction Pte Ltd [2020] SGHC 167, the court held that these costs are generally not recoverable as damages in a subsequent civil suit, as the statutory scheme intends for parties to bear their own costs in the "rough and ready" adjudication process (at [250]).

"I find the LD quantum in cl 6 of the Subcontract to be a genuine pre-estimate of loss and not a penalty... The plaintiff is entitled to LD for Phase 1 in the amount of $356,400." (at [102] and [251])

What Was the Outcome?

The court delivered a mixed result, though largely in favor of the plaintiff, Zhong Kai. The claims were partly allowed, with the court granting substantial awards for liquidated damages and rectification costs while dismissing several of the defendant's counterclaims and overturning previous adjudication findings.

The operative orders of the court were as follows:

"In conclusion, I allow the plaintiff’s claims for: (a) LD for Phase 1 in the amount of $356,400; (b) Replacement and rectification works in the amount of $197,501.49; and (c) The three VOs in the AD to be overturned." (at [251])

Specifically, the court awarded Zhong Kai $356,400 in liquidated damages for Phase 1. This was calculated based on the daily rate stipulated in Clause 6 of the Subcontract, applied to the period of delay found by the court. The court found that Diamond Glass was responsible for the failure to meet the Phase 1 completion date and that no valid extensions of time had been granted that would have relieved them of this liability. However, the court did not award the full amount of LD sought for Phase 2, as the evidence regarding the specific cause of delay for that phase was more contested and partially attributed to site coordination issues beyond the subcontractor's sole control.

For the Replacement and Rectification Works, the court awarded $197,501.49. This sum represented the actual costs incurred by Zhong Kai in hiring third-party contractors to finish the work Diamond Glass had abandoned and to fix the defects in the already-installed cladding. The court was satisfied that these costs were reasonable and directly consequential to Diamond Glass's breach of contract. The court rejected Diamond Glass's argument that the replacement works were an "upgrade" or otherwise outside the original scope of the Subcontract.

Regarding the Variation Orders, the court's decision to overturn three VOs from the earlier Adjudication Determination (AA 339) meant that Diamond Glass was required to credit or repay sums previously accounted for in the adjudication process. This highlights the risk for subcontractors who rely solely on adjudication wins without ensuring they have the contractual documentation to withstand a full trial on the merits.

On the issue of Costs, the court did not make an immediate final order but instead reserved the matter for further submissions. The judgment noted at [253], "I will hear parties on costs." This is standard practice in complex construction cases where the "partly allowed" nature of the outcome requires a nuanced assessment of which party was truly the "successful" one for the purposes of cost allocation. The court also clarified that the costs of the SOPA adjudication itself were not recoverable as damages, in accordance with Section 30(4) of the SOPA.

In summary, the defendant, Diamond Glass, was found liable for significant sums totaling over $550,000, plus interest and costs to be determined. This outcome underscores the severe financial consequences of site abandonment and the difficulty of challenging well-drafted LD clauses in the Singapore High Court.

Why Does This Case Matter?

The decision in Zhong Kai Construction Co Pte Ltd v Diamond Glass Enterprise Pte Ltd is a landmark for construction practitioners in Singapore for several reasons. First and foremost, it provides a robust application of the Denka Advantech principles in a "real-world" construction subcontracting context. By upholding an LD clause that was challenged as a penalty, the court has signaled that it will not easily interfere with the commercial bargain struck between contractors. For practitioners, this means that the "genuine pre-estimate of loss" test remains a high bar for challengers. As long as the LD rate is not "extravagant and unconscionable," the court will respect the parties' allocation of risk for delay. This provides much-needed certainty for main contractors who rely on these clauses to pass down the risk of project-level LDs to their subcontractors.

Secondly, the case clarifies the evidentiary standards for proving quantum in construction disputes. The court's reliance on Section 32(1)(b) of the Evidence Act to admit third-party invoices is a significant win for practical litigation. In many construction cases, the "maker" of an invoice (e.g., a site foreman or an accounts clerk from a third-party vendor) may have left the company or be otherwise unavailable by the time a suit reaches trial years later. By confirming that these invoices are admissible as business records, the court has reduced the procedural burden on plaintiffs seeking to recover rectification costs. However, the judgment also serves as a warning: while the invoices are admissible, their weight still depends on the plaintiff showing that the works were actually necessary and the rates were reasonable.

Thirdly, the judgment reinforces the "temporary finality" of the SOPA regime. The fact that the High Court overturned three variation orders that had been allowed in an adjudication determination serves as a stark reminder that an adjudication win is not a final victory. Practitioners must advise their clients that the "rough and ready" nature of SOPA means that findings on complex issues like variation authorization can and will be re-examined de novo in a civil suit. This case highlights the importance of maintaining a "trial-ready" evidentiary trail (such as written VO authorizations and site photos) even after a successful adjudication.

Fourthly, the court's treatment of the "duty to mitigate" in the context of site abandonment is instructive. By holding that Zhong Kai acted reasonably in engaging third parties quickly to avoid project-level delays, the court acknowledged the commercial realities of the construction industry. This protects main contractors from being "held to ransom" by a defaulting subcontractor's argument that they should have spent months shopping for the absolute lowest price while the project deadline loomed. The decision aligns with the principle that the victim of a breach is not required to act with "perfect" hindsight, but only with "reasonable" commercial judgment.

Finally, the case settles (or at least reinforces) the position on the non-recoverability of SOPA adjudication costs in subsequent litigation. By strictly applying Section 30(4) of the SOPA, the court has maintained the distinction between the statutory adjudication process and civil litigation. This prevents the "leakage" of adjudication costs into the final damages award, keeping the two regimes distinct. For practitioners, this means that the costs of fighting an adjudication must be viewed as a sunk cost of the SOPA process, regardless of the eventual outcome of the civil suit.

Practice Pointers

• Drafting LD Clauses: Ensure that liquidated damages clauses are clearly linked to specific phases and completion dates. While a detailed contemporaneous calculation of loss is not strictly required to avoid the "penalty" label, having some internal documentation justifying the daily rate can help defend the clause against claims of being "extravagant and unconscionable."
• Evidentiary Preservation: Maintain a rigorous system for filing third-party invoices and correspondence. As seen in this case, these documents can be admitted under Section 32(1)(b) of the Evidence Act, but their utility depends on being able to link them clearly to the specific rectification works necessitated by the breach.
• Managing Site Abandonment: If a subcontractor abandons the site, the main contractor should immediately document the state of the works (via photos and site diaries) and issue a formal notice of default. This evidence is crucial for proving the necessity of replacement works and for defending against claims that the contract was frustrated.
• Variation Order Protocol: Strictly follow the contractual procedure for variation orders. The overturning of the AD findings in this case shows that without clear written authorization or proof that the work was outside the original scope, a subcontractor's claim for VOs is highly vulnerable in a full trial.
• Mitigation Strategy: When engaging third-party contractors for rectification, obtain at least two or three quotes where possible. Even if the most expensive quote is chosen due to time constraints, having the other quotes allows the plaintiff to demonstrate to the court that they acted reasonably and that the costs were within a market range.
• SOPA vs. Civil Suit: Do not treat an Adjudication Determination as the final word. Always evaluate the strength of the evidence presented in the adjudication to determine if it will survive the more rigorous scrutiny of a High Court trial, especially regarding complex factual disputes over delays and variations.
• Pleading Specificity: Ensure that all heads of damage, including specific periods of delay for LD and specific items of rectification, are pleaded with precision. The court's refusal to award the full Phase 2 LD in this case highlights the need for granular evidence for every period of delay claimed.

Subsequent Treatment

As of the date of the extracted metadata, Zhong Kai Construction Co Pte Ltd v Diamond Glass Enterprise Pte Ltd [2021] SGHC 277 stands as a significant first-instance decision. It was subsequently considered in the appeal Diamond Glass Enterprise Pte Ltd v Zhong Kai Construction Co Pte Ltd [2021] SGCA 61, where the Court of Appeal addressed specific conditions regarding the payment of judgment sums. The High Court's application of the Denka Advantech penalty test and its pragmatic approach to the Evidence Act have been noted by practitioners as reinforcing the prevailing judicial trend toward commercial certainty and evidentiary flexibility in construction disputes. The case is frequently cited in local commentaries regarding the finality of SOPA adjudications and the calculation of liquidated damages in subcontracting tiers.

Legislation Referenced

• Building and Construction Industry Security of Payment Act (Cap 30B, 2006 Rev Ed): Specifically Section 30(4) regarding the costs of adjudication proceedings.
• Evidence Act (Cap 97, 1997 Rev Ed): Specifically Section 32(1)(b) regarding the admissibility of statements made in the ordinary course of business.

Cases Cited

• Applied: Denka Advantech Pte Ltd and another v Seraya Energy Pte Ltd and another and other appeals [2021] 1 SLR 631 (regarding the penalty rule and liquidated damages).
• Referred to: Diamond Glass Enterprise Pte Ltd v Zhong Kai Construction Co Pte Ltd [2021] SGCA 61.
• Referred to: AL Stainless Industries Pte Ltd v Wei Sin Construction Pte Ltd [2001] SGHC 243.
• Referred to: GA Engineering Pte Ltd v Sun Moon Construction Pte Ltd [2020] SGHC 167 (regarding SOPA costs).
• Referred to: Hewlett-Packard Singapore (Sales) Pte Ltd v Chin Shu Hwa Corinna [2016] 2 SLR 1083 (regarding the contra proferentem rule).
• Referred to: Jia Min Building Construction Pte Ltd v Ann Lee Pte Ltd [2004] 3 SLR(R) 288 (regarding variation orders).
• Referred to: Lian Soon Construction Pte Ltd v Guan Qian Realty Pte Ltd [1999] 3 SLR(R) 518.
• Referred to: The "Asia Star" [2010] 2 SLR 1154 (regarding the duty to mitigate loss).
• Referred to: Lubenham Fidelities and Investments Co Ltd v South Pembrokeshire District Council (1986) 33 BLR 46.

Source Documents

• Original Judgment (PDF) — [2021] SGHC 277
• eLitigation Case Record