A ConSASS audit runs in three phases. The first is preparation and appointment of an accredited auditing organisation. The second is the on-site audit itself, which moves from an opening meeting through document review, interviews and physical inspection to a closing meeting. The third is scoring, reporting and submission to the Ministry of Manpower (MOM). This guide walks through each stage in the order a construction worksite experiences it, and explains what your team should have ready at every point.
TL;DR
- Worksites with a contract sum of $30 million or more must have their safety and health management system (SHMS) audited with ConSASS at least once every six months, by an SAC-accredited WSH Auditing Organisation.
- The on-site audit follows a fixed sequence: opening meeting, familiarisation tour, interviews with document review, physical inspection and worker interviews, auditor team debrief, closing meeting.
- The current checklist is the 2020 version, with 20 system elements and 204 questions, built around the Plan-Do-Check-Act cycle.
- After the audit, the checklist, scorecard and final audit report are submitted through MOM’s online portal using Singpass.
- Most findings are decided on site evidence, so preparation means proving implementation, not only filing procedures.
Table of Contents
- What a ConSASS audit is, and what “stages” means
- Stage 0: Confirm that your worksite is in scope
- Stage 1: Appoint an accredited auditing organisation
- Stage 2: Prepare the site and the evidence
- Stage 3: The on-site audit, step by step
- Stage 4: Scoring, bands and what the results mean
- Stage 5: Reporting and submission to MOM
- Stage 6: Corrective action and the next cycle
- How ConSASS connects to ISO 45001, bizSAFE and Design for Safety
- Common mistakes at each stage
- Our perspective
- Prepare for your next ConSASS audit with MOSAIC
- FAQ
- Sources
What a ConSASS audit is, and what “stages” means
ConSASS stands for Construction Safety Audit Scoring System. According to MOM’s explanation of ConSASS, its checklist and scorecard evaluate the effectiveness and maturity of a company’s occupational safety and health management system.
When contractors search for “audit stages”, they usually mean one of three things:
- The audit lifecycle: appointment, audit, reporting, submission and follow-up.
- The on-site sequence: what happens on the audit days themselves.
- The maturity bands used in scoring.
This article covers all three, because a site team needs the full picture to plan resources.
Stage 0: Confirm that your worksite is in scope
Before any audit is scheduled, establish whether the requirement applies. MOM’s requirements page states that construction worksites with a contract sum of $30 million or more must engage an SAC-accredited WSH Auditing Organisation to audit their SHMS using ConSASS at least once every six months. The first audit must take place within six months of getting a BCA permit, or within six months of starting operations if no BCA permit is needed.
Two practical points follow:
- The same page notes that since 1 April 2019, construction worksites no longer register with MOM, but they must still comply with the WSH Act and its subsidiary legislation.
- The mandatory requirement has applied since August 2011, as set out in the ConSASS user guide.
If your project sits below the threshold, a ConSASS audit can still be a sound way to benchmark your system, particularly when a main contractor or developer asks for evidence of maturity during tendering.
Stage 1: Appoint an accredited auditing organisation
The user guide records that since 2019 only SAC-accredited WSH Auditing Organisations are authorised to conduct ConSASS audits. Your appointment decisions should therefore cover:
- Accreditation: confirm the organisation’s accreditation scope covers ConSASS audits of construction worksites.
- Independence: the audit is meant to be an independent assessment, so the auditing body should not be the one that wrote your safety procedures for the same worksite.
- Timing: fix the audit window early so that it lands inside the six-month cycle and not at the end of a critical pour or handover.
- Checklist version: the 2020 requirements are the criteria listed in MOM’s auditing requirements circular. The transition took effect on 1 October 2021, and from that date only the new checklist was allowed, according to the WSH Council announcement.
At the appointment stage, agree the scope in writing: which worksite, which contractors and subcontractors, which dates, and who will act as the site coordinator for the auditors.
Stage 2: Prepare the site and the evidence
The checklist is structured along the Plan-Do-Check-Act cycle, with five framework areas, according to the user guide: WSH Policy (Plan), Planning (Plan), Support and operation (Do), Performance evaluation (Check) and Improvement (Act). Preparation should mirror that structure.
What changed in the 2020 checklist
The WSH Council announcement describes the revised checklist this way:
- System elements increased from 17 to 20, in alignment with ISO 45001.
- Bands reduced from four to three, placing less focus on documentation checks.
- Questions reduced from 348 to 204, a 41.1% reduction.
The auditor briefing slides add that implementation questions rose from 37.9% to 50.9% of the total, and that new questions reflect WSH 2028 recommendations (Ownership, Health and Technology), Design for Safety and Near Miss Reporting.
The consequence for preparation is direct: a site with immaculate files and weak field practice will score poorly, because more than half the questions test implementation.
A preparation checklist
- Assemble the WSH policy, organisation chart, risk management records and legal register for the worksite.
- Confirm that risk assessments match the actual work activities now under way, not the ones from mobilisation.
- Collect training, competency and induction records for workers and subcontractors.
- Check inspection, permit-to-work and incident and near-miss records for consistency.
- Brief the supervisors and workers who are likely to be interviewed. They should be able to explain their own roles and procedures in their own words.
- Prepare evidence of Design for Safety coordination where the project falls under those regulations (see below).
For a more detailed approach to turning each checklist requirement into site evidence, see our guide on how to convert the ConSASS checklist into site evidence.
Stage 3: The on-site audit, step by step
The user guide sets out a sequence for the audit. In practice it unfolds as follows.
| Step | What happens | What the site team should provide |
|---|---|---|
| Opening meeting | Auditors confirm scope, audit plan, sampling approach and logistics | Senior management, project and safety leads |
| Familiarisation tour | A walk of the worksite to understand activities, layout and hazards | A competent escort who can answer questions |
| Interviews with system owners, with document review | Each element owner explains the system and shows records | Element champions, with records at hand |
| Physical inspection and worker interviews | Auditors verify conditions and practices in the field | Access to work areas, workers and subcontractors |
| Auditor team debrief | Auditors consolidate findings and agree scores | Usually no site input; allow time and a room |
| Closing meeting | Findings are presented to management | Management decision-makers |
The three audit methods
The guide explains that the protocol uses three components: Document Review (DR), Interview of Personnel (IP) and Physical Inspection (PI). Each checklist question indicates which of these the auditor may use. The guide also says audits should lean on physical inspection to verify that system elements work on site, with verification done through interviews with employees and workers.
Sampling and passing criteria
The guide states that the general passing criterion is 70% of the sample population. Where a sample is two or fewer, the auditor checks all of it and every item must meet the criteria. For interviews, auditors are expected to cover staff at different levels: company management, line management, workers, WSH personnel, and subcontractors and suppliers.
That sampling rule shapes how you prepare. One non-compliant scaffold or one worker who cannot explain a permit rule may not sink a question, but a pattern will. Consistency across subcontractors matters as much as the main contractor’s own performance.
Typical duration
The length of an audit depends on worksite size, the number of contractors and the number of elements in scope, so the auditing organisation should give you a schedule at the appointment stage. Do not assume a single day.
Stage 4: Scoring, bands and what the results mean
The scorecard tabulates results from the audited SHMS elements and gives a quick visualisation of their maturity. MOM states that this helps management decide how to allocate resources to strengthen weak areas.
Treat the scorecard as a management tool, not only a compliance form:
- Weak elements show where to direct supervision and training budget first.
- Elements with strong documents but weak field results signal a gap between procedure and practice.
- Repeat audits every six months let you show a trend, which is useful in tender submissions and client reviews.
The auditor briefing slides also note that some ISO 45001 requirements are placed in Band III as best practices, for example social risk factors such as victimisation, harassment and bullying. Higher bands therefore reward practices that go beyond the baseline.
Our article on the benefits of conducting regular ConSASS audits looks at how companies use these trends over successive cycles.
Stage 5: Reporting and submission to MOM
Once the audit is complete, results must be submitted. MOM’s submission page lists what the submitter needs:
- The submitter’s ID and Singpass.
- The workplace number, workplace name and employer address.
- The completed ConSASS checklist, scorecard and final audit report.
The user guide adds that scores and supporting documents go through MOM’s online WSH eServices portal. Assign one person to own the submission, confirm the details match your registered workplace records, and keep copies of every attachment.
Stage 6: Corrective action and the next cycle
The audit does not finish when the report is filed. The Plan-Do-Check-Act logic of the checklist means the Act element, improvement, applies to your response to the audit as well.
A sound follow-up routine looks like this:
- Rank findings by risk to people, not by how easy they are to close.
- Assign each finding an owner and a due date.
- Verify closure in the field, not only in the document.
- Feed repeat findings back into risk assessments, toolbox topics and subcontractor briefings.
- Start preparation for the next six-month audit while the findings are fresh.
How ConSASS connects to ISO 45001, bizSAFE and Design for Safety
Projects rarely deal with ConSASS alone. Three related frameworks come up repeatedly.
ISO 45001. The user guide says the checklist is derived from SS ISO 45001:2018, SS 679:2021 and relevant WSH Council Approval Codes of Practice, and covers all auditable ISO 45001 clauses except Clause 4.1. A company already running an ISO 45001 system therefore has a head start, although the ConSASS audit still tests site implementation. Our ISO certification service supports companies building that system.
bizSAFE. According to the bizSAFE supporting documents list, Level 3 needs a Risk Management Implementation Audit Report from an Accredited Auditing Organisation, while Level Star needs that report plus an ISO 45001:2018 or SS 651:2019 certificate from a recognised certification body. If you are working towards those levels, our bizSAFE Level 3, 4 and Star support covers the process.
Design for Safety. The auditor briefing slides record that the 2020 checklist incorporated DfS recommendations. Separately, the WSH (Design for Safety) Regulations 2015 apply to developer projects with a contract sum of $10 million or more and development under section 3(1) of the Planning Act, except where the designer was appointed before 1 August 2016. The DfS guidelines describe developers, designers and contractors working together from planning and design to eliminate or reduce foreseeable risks. Our Design for Safety Professional service addresses that upstream coordination.
Common mistakes at each stage
| Stage | Frequent weakness | Better practice |
|---|---|---|
| Scope | Assuming the threshold is checked only at tender | Track the contract sum and permit dates from day one |
| Preparation | Polished files, untrained supervisors | Rehearse interviews with the people who will be asked |
| On site | Escort cannot answer questions | Nominate a competent coordinator per work area |
| Scoring | Reading the total only | Study each element and band |
| Submission | Mismatched workplace details | One owner, one verification pass before filing |
| Follow-up | Closing findings on paper | Verify closure physically |
For a broader view of preparation requirements, see ConSASS requirements for S$30M projects and the safety audit checklist for occupiers.
Our perspective
We see the same pattern across construction worksites: the audit is rarely lost on the audit days. It is lost in the months before, when procedures are written for the file and not for the crew.
Because the 2020 checklist gives greater weight to implementation, we advise clients to treat each of the 20 elements as an operating routine with a named owner, not as a document set. Interview readiness, subcontractor consistency and verified closure of findings are the three habits that most reliably separate a mature system from a paper one.
Our work with construction companies draws on more than 20 years of experience, and we support clients before, during and after the audit cycle, so that each six-monthly result builds on the previous one.
Aman
Prepare for your next ConSASS audit with MOSAIC
If your worksite is approaching its first or next audit cycle, our team can help you map the checklist to your site evidence, brief your interviewees and close findings properly. We offer ConSASS support, alongside WSH audit and inspection and EHS advisory and documentation.
To discuss your project, contact us through the MOSAIC website.
FAQ
How often must a ConSASS audit be done?
At least once every six months for construction worksites with a contract sum of $30 million or more. The first audit must be conducted within six months of getting a BCA permit, or of starting operations if no permit is needed.
Who can carry out a ConSASS audit?
Only an SAC-accredited WSH Auditing Organisation. This has been the rule since 2019, so an internal team can prepare you but cannot issue the mandatory audit.
Which ConSASS checklist applies now?
The 2020 version, which has 20 system elements and 204 questions. It became the only version allowed for accredited auditing organisations from 1 October 2021.
What do we submit to MOM after the audit?
The completed ConSASS checklist, the scorecard and the final audit report, submitted online with the submitter’s Singpass and the workplace details. Check MOM’s submission page for the current process before filing.
Does ConSASS replace ISO 45001 certification?
No. ConSASS is derived from ISO 45001 and other Singapore standards, but it is a worksite audit scoring tool. ISO 45001 certification is a separate process, and it is one of the documents bizSAFE Level Star requires.
Sources
- MOM: What are the basic features of ConSASS?
- MOM: Factory notification and registration requirements
- MOM: ConSASS user guide
- MOM: Submit a ConSASS audit
- MOM circular: Auditing requirements for SHMS
- WSH Council: New ConSASS checklist announcement
- WSH Council: Briefing to accredited auditing organisations
- WSH Council: Supporting documents to apply for bizSAFE
- Singapore Statutes Online: WSH (Design for Safety) Regulations 2015
- WSH Council: Design for Safety guidelines
