| Mohd Kahliab Bin Zainal Abidin | 3330 | Access Platform Engineering | 2017-09-19 | Emaan Inspection Pte Ltd |
| Mohd Kahliab Bin Zainal Abidin | 3330 | Lift and Escalator Engineering | 2017-09-19 | Emaan Inspection Pte Ltd |
| Ng Chew Chiat | 4334 | Geotechnical Engineering | 2010-03-18 | One Smart Engineering Pte. Ltd. |
| Ng Eng Cheong Oswald | 4177 | Lift and Escalator Engineering | 2019-03-21 | Portfolio Engineering Pte Ltd. |
| Ng Kim Leang | 3161 | Lift and Escalator Engineering | 2017-09-19 | NKL Pte Ltd |
| Ng Kim Leang | 3161 | Crane Engineering | 2017-07-18 | NKL Pte Ltd |
| Ng Kim Leang | 3161 | Access Platform Engineering | 2017-07-18 | NKL Pte Ltd |
| Ng Peng Boon | 1903 | Geotechnical Engineering | 2006-05-16 | KCL Consultants Pte. Ltd. |
| Ng Siew Sing | 1964 | Lift and Escalator Engineering | 2018-02-13 | AG Engineering & Safety Services |
| Ng Siew Sing | 1964 | Crane Engineering | 2017-03-23 | AG Engineering & Safety Services |
| Ng Siew Wah | 1478 | Crane Engineering | 2017-04-20 | - |
| Ng Teck Eng | 4457 | Lift and Escalator Engineering | 2017-03-23 | Building and Construction Authority |
| Ng Tong Leng | 1255 | Access Platform Engineering | 2018-08-16 | NTL Engineering Services |
| Ng Tong Leng | 1255 | Crane Engineering | 2018-08-16 | NTL Engineering Services |
| Ng Tong Leng | 1255 | Lift and Escalator Engineering | 2018-08-16 | NTL Engineering Services |
| Ng Tong Leng | 1255 | Pressure Vessel Engineering | 2018-08-16 | NTL Engineering Services |
| Ng Wee Giap Gary | 3795 | Geotechnical Engineering | 2007-04-19 | GNG Consultants Pte. Ltd. |
| Ng Wee Keong | 4252 | Access Platform Engineering | 2017-05-22 | TUV SUD A-Reliance Pte. Ltd. |
| Ng Wee Keong | 4252 | Lift and Escalator Engineering | 2017-03-23 | TUV SUD A-Reliance Pte. Ltd. |
| Ng Yeo Ping | 1674 | Crane Engineering | 2017-07-18 | Y P Ng & Associate Engineers |
| Ng Yeo Ping | 1674 | Pressure Vessel Engineering | 2017-07-18 | Y P Ng & Associate Engineers |
| Niu Jianxin | 3996 | Geotechnical Engineering | 2007-09-20 | GeoAlliance Consultants Pte. Ltd. |
| Oh Chun Siang | 5229 | Access Platform Engineering | 2025-01-23 | One Engineering (Mech) Pte. Ltd. |
| Oh Chun Siang | 5229 | Crane Engineering | 2023-03-23 | One Engineering (Mech) Pte. Ltd. |
| Oh Chun Siang | 5229 | Lift and Escalator Engineering | 2023-10-26 | One Engineering (Mech) Pte. Ltd. |
| Oh Wee Siong | 5191 | Crane Engineering | 2022-08-25 | OHWS Engineers Pte. Ltd. |
| Oh Wee Siong | 5191 | Access Platform Engineering | 2024-02-22 | OHWS Engineers Pte. Ltd. |
| Ong Chee Wee | 4336 | Tunnelling Engineering | 2022-10-20 | One Smart Engineering Pte. Ltd. |
| Ong Chee Wee | 4336 | Geotechnical Engineering | 2013-11-29 | One Smart Engineering Pte. Ltd. |
| Ong Chong Ping | 1583 | Access Platform Engineering | 2017-03-23 | Eletrain Pte. Ltd. |