Case Details
- Citation: [2020] SGHC 228
- Title: Leong Sow Hon v Public Prosecutor
- Court: High Court of the Republic of Singapore
- Date of Decision: 29 October 2020
- Judge: Aedit Abdullah J
- Coram: Aedit Abdullah J
- Case Number: Magistrate's Appeal No 9156 of 2019
- Parties: Leong Sow Hon (appellant) v Public Prosecutor (respondent)
- Counsel for Appellant: N Sreenivasan SC, S Balamurugan, Eva Teh Jing Hui (K&L Gates Straits Law LLC) (instructed); Sivanathan Wijaya Ravana (R. S. Wijaya & Co)
- Counsel for Respondent: Kristy Tan, Yang Ziliang, Ho Lian Yi, Mark Yeo and Ho Jiayun (Attorney-General's Chambers)
- Legal Areas: Criminal Law — Statutory offences; Criminal Procedure and Sentencing — Sentencing
- Statutory Offence: Building Control Act (Cap 29, 1999 Rev Ed) (“BC Act”), s 18(1) punishable under s 18(3)
- Other Charge Taken Into Account for Sentencing: BC Act, s 43A(a) punishable under s 43A (falsely certifying evaluation/analysis/review)
- Key Concepts: Mitigating factors; “Clang of the prison gates” principle
- Judgment Length: 23 pages, 11,820 words
- Proceedings Below: Appeal against sentence of six months’ imprisonment imposed by the District Judge
Summary
In Leong Sow Hon v Public Prosecutor [2020] SGHC 228, the High Court dismissed an appeal against sentence arising from a serious breach of statutory duties under Singapore’s building control regime. The appellant, an accredited checker for the design and structural checking of a major viaduct project, pleaded guilty to failing to evaluate, analyse, and review structural design and to perform independent calculations for key structural elements—specifically, permanent corbels forming part of the viaduct’s load-bearing system. The offence was charged under s 18(1) of the Building Control Act (BC Act), punishable under s 18(3).
The sentencing issue turned on the appropriate weight to be given to general deterrence in offences affecting public safety, and whether the appellant’s role and alleged mitigating circumstances warranted a non-custodial sentence. The High Court upheld the District Judge’s view that the custodial threshold had been crossed and that a six-month term of imprisonment was warranted given the high potential harm and the appellant’s medium culpability. The court also addressed the appellant’s attempt to adduce further evidence on appeal and rejected the argument that the statutory checking framework allowed him to rely on others in a way that materially reduced his responsibility.
What Were the Facts of This Case?
The appellant, Mr Leong Sow Hon, was an accredited checker appointed in June 2016 under the BC Act to perform accredited checking for the viaduct works. The viaduct, approximately 1.8 kilometres long, comprised eight flyovers, each supported by multiple columns and integrated structural components. The design included expansion joints and permanent corbels—reinforced concrete projections at expansion joints—that transferred vehicular loads from flyovers to independent columns. The court treated these permanent corbels as “key structural elements” because they were essential for the viaduct’s support and overall structural stability.
Under the statutory scheme, the accredited checker’s role was not merely administrative. The appellant accepted that, pursuant to s 18(1) of the BC Act read with the Building Control (Accredited Checkers and Accredited Checking Organisations) Regulations, he had a duty to evaluate, analyse, and review the structural design in the plans and to perform original calculations to determine the adequacy of key structural elements. The appellant further accepted that the permanent corbels were key structural elements within the meaning of the BC Act.
On 14 July 2017, temporary structures at two piers gave way, leading to the collapse of precast girders and formwork supporting the casting of the viaduct deck slab. Tragically, one worker died and ten others were injured. Importantly, the court emphasised that the collapse was not caused by the permanent corbels that formed the subject matter of the proceeded charge. Nevertheless, after the collapse, the calculations for the whole structure were checked and it was found that several permanent corbels were inadequately designed.
In the submissions to the Building and Construction Authority (BCA) for the relevant plans, there were no independent calculations for the permanent corbels prepared or submitted by the appellant. During the BCA’s investigations, the appellant initially claimed he had performed original calculations and found the corbels adequate. When asked to provide evidence, he could not. He later admitted that he had been untruthful and conceded that no calculations had been done at all. Subsequent investigations revealed that corbels at eight out of ten piers were inadequately designed: five could not support intended weight during the construction stage and would have collapsed during slab casting; the remaining three might have supported construction-stage loads but would have shown significant cracking under full traffic load, leading to sudden brittle failure and collapse. The court also noted that the project’s completion date was delayed by at least two years due to the collapse and subsequent rectification.
What Were the Key Legal Issues?
The appeal raised two principal legal issues. First, the court had to determine whether the District Judge erred in concluding that the custodial threshold had been crossed and in imposing a six-month imprisonment term. This required an evaluation of the sentencing principles applicable to offences under the BC Act, particularly the role of general deterrence where public safety is implicated.
Second, the appellant sought to mitigate his sentence by arguing that he was entitled to rely on other professionals within the statutory checking system, and that failures by other parties significantly contributed to the ultimate risk. The court therefore had to consider the extent to which the statutory framework permits an accredited checker to shift responsibility, and whether the appellant’s alleged inadvertence and lack of direct causation of the collapse could justify a non-custodial sentence such as a fine or a short detention order (SDO).
Additionally, the appellant filed a criminal motion to adduce further evidence on appeal. The legal issue here was whether the fresh evidence was “necessary” under s 392(1) of the Criminal Procedure Code (CPC) and whether it could affect the sentencing outcome. The report sought to argue that defects would likely have been detected before any ultimate failure because corbels would have behaved in a ductile manner, exhibiting cracking and rotation before collapse, and that on-site supervision would have identified such signs.
How Did the Court Analyse the Issues?
The High Court began by framing the offence within the legislative purpose of the BC Act. The court accepted that the statutory checking regime is designed to protect public safety by ensuring that key structural elements are properly evaluated through independent calculations. The accredited checker’s duty is therefore central to the regulatory architecture. The court rejected the appellant’s attempt to characterise his role as one that could be diluted by reliance on other professionals. While the statutory system involves multiple actors—including the qualified person (QP), site supervisors, and the builder—the accredited checker remains statutorily responsible for performing the specific evaluative and calculation tasks mandated by s 18(1) and the regulations.
On sentencing principles, the court endorsed the District Judge’s approach that general deterrence should be dominant for offences under s 18(3) where public safety is at stake. The court noted that Parliament had increased penalties for offences under s 18 in 2008, signalling a legislative intent to treat breaches of structural checking duties seriously. The court also considered parliamentary materials and the statutory history relied upon by the Prosecution, which indicated that deterrence should take a custodial form in appropriate cases. In this context, the court treated the potential harm as high even though the specific collapse that occurred on 14 July 2017 was not caused by the permanent corbels in question.
The court examined culpability and harm. Although the appellant did not directly cause the initial collapse, his failure to perform independent calculations for key structural elements meant that inadequate design defects were not identified at the planning and checking stage. The court treated this as a serious breach because it undermined the safety assurance function of the accredited checking process. The court also considered that the appellant’s conduct involved more than a mere technical lapse: the absence of independent calculations and the later admission that he had been untruthful when first questioned demonstrated a troubling disregard for the statutory duty.
Regarding the appellant’s reliance arguments, the court acknowledged the existence of a collective statutory system but emphasised that the accredited checker’s statutory duty is not optional or delegable. The court reasoned that allowing an accredited checker to rely on others to detect defects would dilute the very purpose of independent checking. The statutory scheme assigns specific responsibilities to different actors; the accredited checker’s duty exists precisely to provide an additional layer of safety assurance. Accordingly, the court found that failures by other parties could not substantially reduce the appellant’s culpability for his own admitted breach.
On the motion to adduce further evidence, the court applied the CPC framework for admitting fresh evidence on appeal. The report’s thesis was that corbels would have exhibited ductile behaviour, and that any cracking would likely have been detected by the supervision team before ultimate failure. The High Court, however, was not persuaded that this would materially alter the sentencing assessment. The court’s reasoning reflected the sentencing context: the offence was committed at the stage of failing to perform required independent calculations and evaluations. The court was therefore reluctant to treat speculative post hoc detection possibilities as a sufficient mitigating factor to justify a non-custodial sentence.
Finally, the court addressed the “clang of the prison gates” principle. This principle generally recognises that where an accused has already begun serving a custodial sentence, the fact of incarceration is a relevant consideration in sentencing adjustments on appeal. In this case, the court’s discussion reinforced that the sentence imposed was not manifestly excessive and that there was no compelling basis to interfere with the District Judge’s assessment. The court’s overall analysis suggested that the custodial term was calibrated to reflect the seriousness of the statutory breach, the public safety dimension, and the need for deterrence.
What Was the Outcome?
The High Court dismissed the appeal and upheld the District Judge’s sentence of six months’ imprisonment. The court found that the sentencing decision was not wrong in principle and that the custodial threshold was properly crossed given the high potential harm and the appellant’s medium culpability.
Practically, the decision confirms that accredited checkers who fail to perform independent calculations for key structural elements under the BC Act face a real risk of custodial sentences, even where the immediate collapse that occurred on site was not caused by the specific structural components subject to the charge.
Why Does This Case Matter?
This decision is significant for practitioners because it clarifies the sentencing approach for statutory offences under the BC Act involving accredited checking. The court’s emphasis on general deterrence and the centrality of the accredited checker’s role underscores that compliance failures in structural safety assurance are treated as matters of public safety rather than mere regulatory non-compliance.
For lawyers advising accredited checkers, design professionals, and construction stakeholders, the case illustrates that arguments based on reliance on other professionals are unlikely to succeed where the accused’s statutory duty is explicit and personal in nature. The court’s reasoning suggests that the existence of a multi-actor framework does not reduce the accredited checker’s responsibility for independent evaluation and calculations. In other words, the statutory system is collective in structure but not collective in accountability.
From a sentencing perspective, the case also demonstrates the limits of mitigation based on speculative “would have been detected” reasoning. Even if defects might theoretically have been caught later during supervision or rectification, the offence is anchored in the failure to perform the required checking and calculations at the relevant stage. The decision therefore supports a more stringent approach to mitigation in public safety-related building offences.
Legislation Referenced
- Building Control Act (Cap 29, 1999 Rev Ed) (“BC Act”), including ss 8, 11, 18(1), 18(3), 43A(a)
- Building Control (Accredited Checkers and Accredited Checking Organisations) Regulations (Cap 29, Rg 2, 2002 Rev Ed), including para 7(1)
- Criminal Procedure Code (Cap 68, 2012 Rev Ed) (“CPC”), s 392(1)
- Workplace Safety and Health Act (WSHA) (referenced in metadata)
- Building Control Ordinance (referenced in metadata)
- California Building Standards Code (referenced in metadata)
- New York City Building Code (referenced in metadata)
Cases Cited
- [2020] SGHC 82
- [2020] SGHC 228
- [2020] SGHC 99
Source Documents
This article analyses [2020] SGHC 228 for legal research and educational purposes. It does not constitute legal advice. Readers should consult the full judgment for the Court's complete reasoning.