Deep Excavation Approval in Singapore: BEV

Deep excavation that involves earth retaining or stabilising structures (ERSS) normally needs a BCA permit to start structural works, submitted through CORENET e-Submission, and MOM rules apply where hazardous work at height is involved. BCA states that the permit is processed in 7 days once your application is complete. Your next step is to engage a Qualified Person (QP) to prepare the BEV_ERSS forms and the permit packet.

TL;DR:

URA permission may also apply when earthworks exceed Form DC 5 thresholds for ground level changes or affected area; have your QP check both triggers.

BCA’s seven day processing period begins only after a complete CORENET application; surveys, neighbor notices, missing annexes, and information requests can extend the overall schedule.

MOM requires a Permit to Work and Fall Prevention Plan when falls over 3 metres are possible, including into excavations; edge protection may qualify for an exemption.

After approval, the QP must supervise works, maintain monitoring records, and obtain BCA’s prior approval for material design changes; notice after work begins risks enforcement.

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When does deep excavation need statutory approval?
Which authorities and permits apply, and how do you submit?
What is the step-by-step checklist and realistic timeline?
What documents and site obligations continue during construction?
Where do approvals usually go wrong?
How can we help you get deep excavation approval?
FAQ
Sources

When does deep excavation need statutory approval?

An ERSS is the temporary structure that holds soil back and keeps the excavation stable, such as sheet piles, diaphragm walls or soldier piles with struts. Once your design relies on one, the ERSS submission forms under BCA’s BEV_ERSS set apply, alongside the structural permit. Our guide to the 1.5m trigger to BCA walks through the threshold in detail, and URA’s Form DC 5 sets out the planning-permission criteria.

Earthworks have a second, separate trigger. URA’s guidance sets thresholds for changes in ground level and for the area affected, and works beyond them need planning permission. The Form DC 5 guidance also lists the plans you must supply, including location and topographical plans, cross-sections and proposed contours.

Three situations catch teams out most often:

A deep basement under a new building, where the ERSS and the earthworks both need clearance.
A shaft excavated next to a road, drain or other public asset, which pulls in more agencies.
Earthworks that accompany building erection, where site levelling is wrongly treated as incidental.

If your project matches any of these, assume approval is required and confirm the exact trigger with your QP.

Which authorities and permits apply, and how do you submit?

Several agencies can hold a stake in one excavation, each with its own permit or consent:

BCA: approval of structural plans and a permit to start structural works. Applications go through CORENET e-Submission, and ERSS projects use the BEV_ERSS forms.
URA: earthworks permission where the DC 5 thresholds are exceeded.
MOM: a Permit-to-Work (PTW) and a Fall Prevention Plan for hazardous work at height, which the WSH (WAH) factsheet ties to any place where a person could fall more than 3 metres, including a fall into a depth.
Other agencies: check whether your project needs additional clearances.
Design changes: a material change to an approved design needs explicit prior BCA approval, while immaterial changes may proceed only under limited conditions.

Check whether your project also needs fire safety submissions, and plan for them early. For the full sequence of stages, see our construction approval workflow guide and the project submission requirements guide.

What is the step-by-step checklist and realistic timeline?

Work through the steps in this order:

Appoint a QP and commission the groundwork. Order the geotechnical investigation and the pre-construction survey. BCA requires the pre-construction survey and communication plan as part of the permit process.
Prepare the technical packet. This covers the ERSS design and calculations, structural drawings, monitoring plan, site and topographical plans, and the BEV_ERSS and BCA-BE-Permit forms.
Handle neighbors. For landed projects, assemble the neighbour notifications and the notification forms for the Commissioner of Building Control, and prepare any URA earthworks documents.
Submit through CORENET. The permit for structural works is processed in 7 days once the application is complete. Treat that as the clock after completeness, and keep contingency for requests for information.
Set up execution systems after approval. Start ground movement monitoring, put the PTW and Fall Prevention Plan in place, and keep records ready for periodic submission.

Pro Tip: Have your QP check the whole packet against the forms before you submit, to help avoid requests for missing information.

The seven days only start counting when nothing is missing, so the realistic timeline is mostly about how fast you assemble the packet. Geotechnical work and neighbour notifications usually set the pace, not the permit itself.

What documents and site obligations continue during construction?

Approval is not the end of the paperwork. Expect to hold and maintain:

The geotechnical investigation report.
ERSS design calculations and drawings.
The ground movement monitoring plan and its running records.
Site inspection and approval records.

Your QP endorses the designs, supervises the works, tells BCA about material changes and submits the required records. Monitoring is continuous, and BCA’s guidance points to monitoring and documentation as the critical challenge in deep excavation.

On safety, the PTW and Fall Prevention Plan apply wherever a fall of more than 3 metres is possible. Only limited exceptions exist, for example where adequate edge protection is provided.

Enforcement is real: following the Tanjong Katong Road South sinkhole, BCA, MOM and LTA investigations showed that enforcement action follows safety and compliance failures in excavation projects. The authorities emphasise supervision and ground stability management.

For the design side of ground risk, see our article on ERSS in deep excavations.

Where do approvals usually go wrong?

Most delays I see are paperwork, not engineering. Pre-construction surveys are left until the last week, annexes go missing, neighbour consents arrive late, and the design changes after the packet is built. Each can lead to further questions and delay the process.

A consultant earns the fee by removing those cycles: assembling a complete BEV_ERSS packet, providing the QP endorsement, coordinating the CORENET submission and agency liaison, and setting up the monitoring regime before the first cut. Our overview of common earthworks failure causes shows why monitoring cannot be bolted on later.

One rule is worth repeating to every site team: treat any material design change as needing prior BCA approval. “We will tell them afterward” risks non-compliance and enforcement action.

— Aman

How can we help you get deep excavation approval?

Teams come to us to cut the time between a drawing and a permit. We prepare the full packet so your first submission is a complete one.

Our relevant services:

Structural and geotechnical engineering consultation
BEV_ERSS preparation
PE and QP endorsement
CORENET and statutory authority submission assistance
Monitoring-plan setup
Temporary works design

What you get is a complete permit packet and coordinated agency submissions, so the 7-day processing clock starts on a clean application. You can see the full list on our services page, and details of endorsements are on our PE endorsement and authority submissions page. Contact us for a permit-readiness review or submission support before you commit to a program.

FAQ

Do all deep excavations need BCA approval?

Not every excavation, but those involving ERSS or structural works generally do. BCA requires a permit to start structural works, and the processing time is 7 days once the application is complete. Confirm your case with a QP.

How do I apply for excavation permits in Singapore?

You apply through the CORENET e-Submission system, with a QP preparing the BEV_ERSS forms and supporting documents. Earthworks above URA’s thresholds need separate planning permission, and works near roads or drains may need LTA or PUB clearance.

When is a Permit-to-Work required for excavation?

A PTW and a Fall Prevention Plan are needed for hazardous work at height where a person could fall more than 3 metres, including into depths. Limited exceptions exist where adequate edge protection is provided.

Can I change the design after approval?

Material changes need explicit prior BCA approval. Immaterial changes may proceed only under limited conditions, so ask your QP to classify the change before work continues.

Is a pre-construction survey mandatory?

Builders must conduct pre-construction surveys, and landed developments also require neighbour notification. These form part of the BCA permit process.