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| Wong Kian Lin | 5362 | Pressure Vessel Engineering | 2024-10-24 | Inspect Now Pte. Ltd. |
| Wong Kian Lin | 5362 | Crane Engineering | 2025-01-23 | Inspect Now Pte. Ltd. |
| Wong Ling Chye | 4356 | Geotechnical Engineering | 2016-09-22 | Arup Singapore Private Limited |
| Wong Siik Khai | 1397 | Lift and Escalator Engineering | 2018-04-11 | - |
| Wong Yit Hong | 4555 | Lift and Escalator Engineering | 2017-11-18 | - |
| Yang Haibo | 4708 | Geotechnical Engineering | 2021-03-25 | Sentosa Development Corporation |
| Yap Shih Lim | 5091 | Geotechnical Engineering | 2023-01-26 | A-Terra Consultants Pte. Ltd. |
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| Yeo Ann Cheong | 2492 | Lift and Escalator Engineering | 2017-02-16 | TUV SUD A-Reliance Pte. Ltd. |
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| Yeo Kheng Hock Alvin | 4226 | Crane Engineering | 2017-07-18 | AY Safety Consultancy & Inspection Services |
| Yeo Kheng Hock Alvin | 4226 | Access Platform Engineering | 2017-07-18 | AY Safety Consultancy & Inspection Services |
| Yeo Kheng Hock Alvin | 4226 | Pressure Vessel Engineering | 2017-07-18 | AY Safety Consultancy & Inspection Services |
| Yeo Kwee Ming | 3873 | Lift and Escalator Engineering | 2019-05-16 | Wistec Engineers Pte. Ltd. |
| Yeo Lily | 3600 | Geotechnical Engineering | 2007-07-19 | AGS Consultants Pte. Ltd. |
| Yeong Chark Sung | 3985 | Pressure Vessel Engineering | 2017-10-23 | AKC Engineering Inspection Services |
| Yeong Chark Sung | 3985 | Access Platform Engineering | 2017-10-23 | AKC Engineering Inspection Services |
| Yeong Chark Sung | 3985 | Lift and Escalator Engineering | 2017-10-23 | AKC Engineering Inspection Services |
| Yeong Chark Sung | 3985 | Crane Engineering | 2017-10-23 | AKC Engineering Inspection Services |
| Yeow Mei Leng | 3159 | Lift and Escalator Engineering | 2021-07-21 | Arup Singapore Private Limited |
| Yet Nai Song | 3565 | Geotechnical Engineering | 2007-07-19 | Building and Construction Authority |
| Yogeeswaran s/o Sivasithamparam | 2881 | Pressure Vessel Engineering | 2017-03-23 | CASY Engineering Consultancy Pte. Ltd. |
| Yogeeswaran s/o Sivasithamparam | 2881 | Lift and Escalator Engineering | 2019-05-16 | CASY Engineering Consultancy Pte. Ltd. |
| Yogeeswaran s/o Sivasithamparam | 2881 | Amusement Ride Engineering | 2011-02-17 | CASY Engineering Consultancy Pte. Ltd. |
| Yong Chye Lim | 3959 | Access Platform Engineering | 2017-05-22 | Syn@pse Engineering Services |
| Yong Chye Lim | 3959 | Lift and Escalator Engineering | 2017-05-22 | Syn@pse Engineering Services |
| Yong Chye Lim | 3959 | Crane Engineering | 2017-05-22 | Syn@pse Engineering Services |
| Yong Chye Lim | 3959 | Pressure Vessel Engineering | 2017-05-22 | Syn@pse Engineering Services |
| Yong Deung Ming | 3982 | Geotechnical Engineering | 2007-04-19 | JIB Specialist Consultants Pte. Ltd. |