| Liew Lee Lin @Theresa Liew | 3961 | Access Platform Engineering | 2017-04-20 | IQS SERVICES PTE. LTD. |
| Liew Wan Sein | 4703 | Access Platform Engineering | 2017-05-22 | Sein Inspection Services |
| Liew Wan Sein | 4703 | Lift and Escalator Engineering | 2017-05-22 | Sein Inspection Services |
| Liew Wan Sein | 4703 | Crane Engineering | 2017-05-22 | Sein Inspection Services |
| Liew Wan Sein | 4703 | Pressure Vessel Engineering | 2017-05-22 | Sein Inspection Services |
| Lim Ah Hock @ Albert Lim | 3869 | Lift and Escalator Engineering | 2017-02-16 | AL Consulting Engineers |
| Lim Ah Sang | 2421 | Pressure Vessel Engineering | 2017-03-23 | Vance Engineering Pte Ltd |
| Lim Chee Eng | 3079 | Geotechnical Engineering | 2007-05-17 | Pintary Foundations Pte. Ltd. |
| Lim Chee Wei | 3260 | Pressure Vessel Engineering | 2019-05-16 | Preveq |
| Lim Chi-Sharn | 4605 | Geotechnical Engineering | 2015-06-18 | IC Singapore Pte. Ltd. |
| Lim Chin Guan | 3497 | Crane Engineering | 2017-02-16 | C G Engineering Pte. Ltd. |
| Lim Chin Guan | 3497 | Access Platform Engineering | 2017-03-23 | C G Engineering Pte. Ltd. |
| Lim Chin Guan | 3497 | Lift and Escalator Engineering | 2017-03-23 | C G Engineering Pte. Ltd. |
| Lim Chin Guan | 3497 | Pressure Vessel Engineering | 2017-03-23 | C G Engineering Pte. Ltd. |
| Lim Chun Hong | 4705 | Geotechnical Engineering | 2021-05-27 | Building and Construction Authority |
| Lim Chye Meng | 2792 | Lift and Escalator Engineering | 2018-04-11 | Xin Yi Elevat Pte. Ltd. |
| Lim Eng Cheng | 3503 | Lift and Escalator Engineering | 2020-04-16 | Plan-One Engineering Services |
| Lim Eng Leong | 3589 | Geotechnical Engineering | 2009-05-21 | E L Lim Consulting Engineers |
| Lim Ken Chai | 4142 | Geotechnical Engineering | 2009-07-31 | JIB Specialist Consultants Pte. Ltd. |
| Lim Kia Wee | 4154 | Geotechnical Engineering | 2010-02-18 | TERS Consulting Pte. Ltd. |
| Lim Kim Cheong | 1347 | Geotechnical Engineering | 2007-07-19 | Lim Kim Cheong Consultants |
| Lim Pen Ann Kenny | 3218 | Geotechnical Engineering | 2007-04-19 | T.Y.Lin International Pte. Ltd. |
| Lim Peng Hong | 2529 | Geotechnical Engineering | 2007-04-19 | PH Consulting Pte. Ltd. |
| Lim Yong Kok | 3422 | Lift and Escalator Engineering | 2017-04-20 | Meinhardt (Singapore) Pte Ltd |
| Lin Jian Jun | 4427 | Tunnelling Engineering | 2023-05-18 | SGT Engineering Consultancy Pte. Ltd. |
| Lin Jian Jun | 4427 | Geotechnical Engineering | 2015-06-18 | SGT Engineering Consultancy Pte. Ltd. |
| Ling Chong Yuen | 4462 | Geotechnical Engineering | 2016-02-16 | Meinhardt (Singapore) Pte Ltd |
| Ling Shiang Yun | 3367 | Lift and Escalator Engineering | 2019-05-16 | iEngineers |
| Liu Xianming | 4296 | Geotechnical Engineering | 2010-02-18 | ERSS Consultants Pte. Ltd. |
| Loh Chang Kaan | 3983 | Geotechnical Engineering | 2007-01-26 | Tritech Consultants Pte. Ltd. |