Singapore BIM Guide for Contractors

Contractors play a vital role in the project supply chain, turning consultants’ designs into real structures. While many are still used to 2D drawings and CAD files, there’s growing understanding of the role of BIM in project delivery. With CORENET X rolling out from Q4 2025, there is a growing number of contracts that specify BIM as part of the project deliverables. This guide highlights the most important aspects of BIM-based delivery.

Regulatory Compliance

In Singapore, BIM is becoming the standard for regulatory submissions, especially for projects above 5,000 sqm. From October 2025, BCA will require BIM submissions for all new buildings above 30,000sqm through CORENET X.

Three key gateways matter to contractors:

• Design Gateway
• Construction Gateway
• Completion Gateway

Design Gateway

In the Design Gateway, consultants and architects prepare the federated BIM model for submission. An Architect may be appointed as a Project Coordinator to manage the federated BIM submission through CORENET X, ensuring that the BIM model is clash-free and compiles with relevant local codes.

Construction Gateway

The Construction Gateway ensures the BIM model is ready for execution. This includes verifying clash-free coordination and compliance with regulations covering structure, fire safety, and accessibility.

At this stage, contractors work at LOD 400, incorporating fabrication details and installation-ready components. This minimizes rework and supports accurate site execution.

Consultants will also check that the contractor’s model aligns with the design intent. Architectural, structural, and MEP models must be fully coordinated before work begins.

Completion Gateway

At the Completion Gateway, main contractors are responsible for delivering an as-built BIM model that accurately reflects the constructed asset. This means capturing deviations from the original design due to site conditions, changes, or construction methods. A registered surveyor may need to be engaged to ensure that the as-built condition of the asset meets the specifications of the project.

Agencies may require additional outputs beyond IFC+SG models, including 2D drawings. The CORENET X Code of Practice explains the requirements for each gateway.

See our workflow comparison: CORENET X vs CORENET 2.

How BIM Is Used in Practice

While many contractors adopt BIM to meet mandates, others use it to enhance delivery. Common applications include:

1. Site Coordination and Clash Detection

BIM highlights conflicts before they cause issues on-site. Tools like Navisworks and ProjectWise are widely used in ICE sessions for coordination.

Regular updates ensure all parties remain aligned, improving planning for materials, labor, and logistics.

2. Generating Accurate 2D CAD Plans

An LOD 350 model includes most interfacing services across architecture, structure, and MEP. Contractors then develop the LOD 400 model for fabrication and assembly.

Not all details fit into 3D models, so 2D CAD plans remain essential. Tools like Revit and OpenBuildings support detailed drawing production.
Using a CDE like BIMcollab or ProjectWise ensures teams always work on the latest versions.

3. Document Transmittals and Audit Trails

BIM-linked documentation improves RFI and submittal management. Linking these directly to model elements maintains traceability and reduces disputes.

In enterprise CDEs like ProjectWise, issues can be tracked in dashboards with clear responsibility and resolution status. Fine-grained access controls protect stakeholder data and ensure accountability.

4. 4D Construction Sequencing

4D BIM links models with schedules, enabling teams to visualize construction sequencing and identify risks early.
Tools like Synchro 4D and Navisworks integrate schedules with BIM to create simulations—helping win stakeholder confidence.

5. Digital Handover and As-built BIM

Owners increasingly expect BIM deliverables to support operations. These include:

• Installation details and adjustments
• Manufacturer data, warranties, and maintenance instructions
• COBie-compliant asset data
• Integration with IoT and sensors

Contractors should compile specifications and coordinate with BIM consultants to structure data for COBie handover. IFC-based exports make COBie spreadsheets easier to generate.

Common BIM Software

Contractors should know both BIM authoring tools (for creating models) and collaboration tools (for review and coordination).
Sometimes, contracts specify which software and version must be used.

With increasing adoption of IFC, contractors can mix tools across vendors without losing interoperability.

Getting Started with BIM

1. Review the BEP – Clarify LOD, formats, and workflows.
2. Appoint a BIM Lead – Assign someone responsible for BIM delivery.
3. Implement a CDE – Ensure version control and transparent communication.
4. Partner with a BIM Specialist – Firms like Bimeco provide modeling, clash checks, and documentation.

Need Help?

Whether you’re bidding on a BIM-mandated project or refining your internal workflows, we can help. From BEP interpretation to model updates and ICE facilitation, our team ensures BIM requirements are met without disrupting site operations.

Use our BIM Cost Calculator to estimate costs or contact us to discuss your needs.