In Singapore, all structural and certain architectural works must comply with the Building Control Act and relevant codes. However, cases still arise where unauthorized building works (UBW) are carried out without the necessary approvals or Professional Engineer (PE) endorsement.

If this happens, property owners may need to apply for retrospective PE endorsement to regularize the works. This article explains what retrospective PE endorsement is, when it’s required, and how you can navigate the process.

What Is Retrospective PE Endorsement?

Retrospective PE endorsement refers to engaging a Professional Engineer to inspect, assess, and endorse building works after they have already been carried out, without prior approval.

This process is usually required when:

• Renovations or additions were done without submission to the Building and Construction Authority (BCA)

• Structural modifications (e.g., removal of walls, addition of mezzanine floors) were made without clearance

• Temporary or permanent works were built outside approved plans

Why Unauthorized Building Works Are a Problem

Carrying out building works without approval can lead to:

• Fines or penalties from BCA

• Stop Work Orders until compliance is achieved

• Safety risks for occupants and the public

• Problems during property sale, leasing, or insurance claims

In many cases, BCA or other agencies (URA, SCDF, PUB) may require retrospective endorsement before granting approval to retain the works.

What Does a PE Do in Retrospective Endorsement?

When engaged, the PE will:

1. Conduct a site inspection to assess the works

2. Review structural integrity and compliance with building codes

3. Recommend remedial actions if safety or design issues are found

4. Prepare drawings, calculations, and reports for submission

5. Endorse and submit the works to BCA (and other agencies if applicable)

In some cases, if the works are found to be unsafe or non-compliant, the PE may recommend removal or rectification instead of endorsement.

Common Scenarios Requiring Retrospective Endorsement

• Addition of a mezzanine floor in industrial or commercial units

• Removal of structural walls or columns during renovations

• Installation of large equipment (e.g., chillers, tanks) without PE approval

• Roof extensions, awnings, or shelters not approved by URA/BCA

• Alterations to fire safety provisions (requiring SCDF clearance)

Cost of Retrospective PE Endorsement

The cost depends on the extent of works and complexity of submissions. As a general guide in Singapore:

👉 Costs may increase if rectification works or additional submissions to agencies (e.g. SCDF, PUB) are required.

Risks of Not Regularizing Unauthorized Works

If unauthorized works are not endorsed and approved:

• Authorities may issue demolition orders

• The property may fail fire safety or structural inspections

• It could affect insurance validity

• Owners may face legal liability for accidents

How to Proceed with Retrospective PE Endorsement

• Engage a Qualified PE – Only a registered PE can endorse and submit to BCA.

• Conduct Site Inspection – The PE will check for compliance and safety.

• Rectify if Necessary – Modify or strengthen works if they do not meet code.

• Prepare Submission – Drawings, calculations, and reports are compiled.

• Submit for Approval – Documents are submitted to BCA (and other agencies).

• Obtain Clearance – Works are legalized and recorded in authority databases.

Need Retrospective PE Endorsement in Singapore?

At AEC Technical Advisory, our team of Professional Engineers has extensive experience in:

• Retrospective endorsement of unauthorized building works

• Submissions to BCA, URA, SCDF, PUB

• Structural safety assessments and rectification advice

👉 Contact us today to regularize your building works and avoid penalties.