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Building and Construction Authority

Record Structural Plan (C-Forms)

Learn about C-forms and record structural plan submissions for completed works. Understand requirements for QPs, material changes, and documentation.

Last updated 26 January 2026
Close-up of two people exchanging a document and pen, representing submission or handover of structural plan C-forms.

Certificate of Supervision and Certificate of Record Plan (C-Forms)

On completion of all structural works or within 14 days of his ceasing to carry out his duties under the Building Control Act,

  1. The Qualified Person (Supervision) for structural works shall submit his certificate stating that the building works have been carried out under his supervision (Form C1 and/or C2)

  2. The Qualified Person (Design) for structural works shall submit his certificate of record structural plans/calculations and declare whether there are minor structural departures or deviations (ie. immaterial change) from the approved plans or not (Form C3)

  3. If there are immaterial change from the approved plans, the Qualified Person (design) for structural works shall also submit

    1. Record Plan

    2. Certificate stating that to the best of his knowledge and belief the departures or deviations do not affect the structural adequacy or stability of the building

    3. Certificate from the accredited checker (if applicable)

    4. Design calculations on the departures and deviations

C-Forms

  • Form BCA-BE-QPCTPW (Form C1) – Certificate of Supervision of Piling Works and Notice of Completion

  • Form BCA-BE-QPCTSSW (Form C2) – Certificate of Supervision of Structural Works

  • Form BCA-BE-CTASST (Form C3) – Submission Certificate of Record Structural Plans/Calculations

Record Plans

  1. All plans are to be clear and legible.

  2. All plans are to be endorsed by both the QP appointed under section 8(1)(a) or 11(1)(d)(i) of the Building Control Act and AC (if applicable), and bear the standard endorsement and Regulations 18(3)(b) and 18(3)(c) (if applicable) of the Building Control Regulations on the first and last sheet of the plans. [refer to section on Endorsement by QP and AC]

  3. The total number of plans, sheet no. and project reference no. are to be indicated on all plans.

Calculations (if necessary)

All calculations are to be endorsed by the QP appointed under section 8(1)(a) or 11(1)(d)(i) of the Building Control Act and AC (if applicable), and bear the standard endorsement and Regulations 18(3)(b) and 18(3)(c) (if applicable) of the Building Control Regulations on the first and last sheet of calculations. [refer to section on Endorsement by QP and AC]

Standard Certifications in Record Plan/Calculations

How to apply

You can submit via the CORENET e-Submission system.

CORENET 2.0

Corenet 2 Portal and ESPro (downloadable) are at https://www.corenet2-ess.gov.sg.

CORENET 2.0 will eventually be replaced by CORENET X, which is mandatory for all new projects by 1 Oct 2026.

Corenet X portal

https://info.corenet.gov.sg/

Useful Information on C-Forms submission

Guidelines for C-Form and Record Structural Plans Submissions [PDF, 11.9 MB]

Submission of Amendment or Record Plans

The following outlines what constitute material and immaterial changes as defined in the Building Control Regulations. Immaterial changes are to be incorporated in the record plans whereas material changes require submission of amendment plans for approval before construction.

Amendment Plans

  1. The Building Control Regulations require that where it is desired that any building works deviate from the approved plans of the building works, and if the deviations involve material changes, the Qualified Person (QP) shall submit amendment plans of the building works to BCA for approval before construction.

  2. "material changes", in relation to building works, is defined in the Regulations as any changes that affect the key structural elements of the structure to such an extent as to require a re-design of the key structural elements.

Record Plans

  1. Where the deviations involve immaterial changes, there is no need to obtain prior approval from BCA before construction. The QP shall only be required to prepare and submitto BCA, on completion of the building works, record plans showing all the immaterial changes, together with the appropriate certificates.

  2. "immaterial changes", in relation to building works, is defined as any changes that either do not affect any key structural elements or that affect the key structural elements but the effects are localised in nature and do not require a re-design of the key structural elements.

For piling works

What constitute material changes in piling works

For piling works, the instances which are deemed as involving material changes are summarised in Table 1 below. Any material change in piling works will require amendment piling plans to be submitted before construction works on the piling works that have deviated from the approved plan are carried out.

Table 1 - Material changes to the piling works

Type of piling system

Adopted Design Criteria

What constitutes material changes

All types

Allowable pile capacity
Load on piles

Any change in the load on piles resulting from major changes in the design of structure that are to be supported by the piles.

Cast In-situ Bored Piles
Barrette Piles
Diaphragm Walls or Contiguous Bored Pile Walls which act as load bearing structures

Unit Skin Friction
Unit End Bearing

Any change in the adopted design criteria

Unit Skin Friction
Unit End Bearing
Pile Embedment Length into Competent Rock

Any change in any of the adopted design criteria;
or
Any reduction in embedment length into competent rock

Percussion Piles

Pile Length
Pile Set Criteria

A lower pile set criterion on site (e.g. larger final pile penetration per blow or larger temporary elastic compression);
or
A lower driving energy used;
or
A reduction of more than 20% in pile length or any other reduction in length which is assessed by QP to be critical to affect the allowable pile capacity.

Jack-in Piles

Pile Length
Pile Termination Criteria

A lower pile termination criterion on site (e.g. lower jack-in load or shorter duration for the application of jack-in load);
or
A reduction of more than 20% in pile length or any other reduction in length which is assessed by QP to be critical to affect the allowable pile capacity.

What constitutes immaterial changes in piling works

  1. Departure or deviations involving immaterial changes to the approved piling plans should be compiled and shown in the record piling plans which are to be submitted on completion of the piling works.

  2. Examples of immaterial changes captured in the Record Piling Plans include:

    1. Localised minor changes on the number and size of piles in a pile group as long as the allowable pile group capacity is adequate for the loads on piles;

    2. Localised minor changes on the orientation of piles in a pile group;

    3. Eccentricities of piles within permissible construction tolerances;

    4. Eccentricities of piles that exceed permissible construction tolerances but allowable capacity of every individual pile in any pile group is not exceeded.

  3. The details to be incorporated in the Record Piling Plans include the following:

    1. As-built pile penetration length;

    2. Location and type of pile load tests;

    3. Pile eccentricities (to be submitted before commencement of basement floor or 1st storey floor, whichever is earlier);

    4. Pile set (for percussion piles);

    5. Pile embedment depth into competent material, where applicable.

Submission of as-built piling records

The following forms must be submitted together with the record piling plans within 28 days of completing piling works.

  • Form BCA-BE-QPCTPW (Form C1) – Certificate of Supervision of Piling Works and Notice of Completion by the Qualified Person for Structural

  • Form BCA-BE-CTASST (Form C3) – Submission Certificate of Record Structural Plans/Calculations