| PO WO GAS & PLUMBING COMPANY LIMITED | Private company limited by shares | Dissolved |
| BUN KEE PLUMBING COMPANY LIMITED | Private company limited by shares | Dissolved |
| MAN YAU PLUMBING COMPANY LIMITED | Private company limited by shares | Dissolved |
| D & I PLUMBING LIMITED | Private company limited by shares | Dissolved |
| KA YUE PLUMBING LIMITED | Private company limited by shares | Live |
| KIN YIP PLUMBING COMPANY LIMITED | Private company limited by shares | Live |
| LOY PLUMBING COMPANY LIMITED | Private company limited by shares | Live |
| YIN WAN PLUMBING LIMITED | Private company limited by shares | Live |
| WAH KEE PLUMBING LIMITED | | Live |
| PLUMBING ACADEMY LONDON LIMITED | Private company limited by shares | Live |
| Advance Plumbing and Drainage Eng. Limited | Private company limited by shares | Live |
| ALIN PLUMBING LIMITED | Private company limited by shares | Live |
| Aqua Plumbing Company Limited | | Live |
| Australian Standard Plumbing Co., Limited | Private company limited by shares | Live |
| BEIJING SANXING PLUMBING & SANITARY WARE LIMITED | Private company limited by shares | Live |
| CASPAR PLUMBING APPARATUS CO., LIMITED | Private company limited by shares | Live |
| CHAMP YIN PLUMBING LIMITED | Private company limited by shares | Dissolved |
| YIK CHEONG PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| YAN CHEONG PLUMBING & DRAINAGE ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| CHING CHIU PLUMBING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| PANG CHING PLUMBING & DRAINAGE LIMITED | Private company limited by shares | Live |
| Chit Fu Plumbing Engineers Limited | Private company limited by shares | Live |
| CHOY TAK KEE PLUMBING WORKS COMPANY LIMITED | Private company limited by shares | Dissolved |
| Chungshun Plumbing Engineering Company Limited | Private company limited by shares | Live |
| CLYDEMAN PLUMBING ENGINEERS LIMITED | Private company limited by shares | Dissolved |
| B & H PLUMBING CO., LIMITED | Private company limited by shares | Dissolved |
| WGH PLUMBING CO., LIMITED | Private company limited by shares | Live |
| GROUP SUCCESS PLUMBING ENGINEERING CO., LIMITED | Private company limited by shares | Live |
| TUNG FAT PLUMBING ENGINEERING CO., LIMITED | Private company limited by shares | Live |
| GLOBAL PLUMBING GROUP CO., LIMITED | Private company limited by shares | Dissolved |
| Hualang Plumbing Co., Limited | Private company limited by shares | Live |
| Jinlida Plumbing Co., Limited | Private company limited by shares | Live |
| Landon Plumbing Co., Limited | Private company limited by shares | Live |
| EVERGREAT PLUMBING & SANITARYWARE CO., LIMITED | Private company limited by shares | Live |
| H&Z PLUMBING SUPPLY CO., LIMITED | Private company limited by shares | Live |
| Xiamen Jielin Plumbing Co., Limited | Private company limited by shares | Live |
| YIJIE PLUMBING CO., LIMITED | Private company limited by shares | Live |
| YOKAMA PLUMBING CO., LIMITED | Private company limited by shares | Live |
| TAT HING CONSTRUCTION & PLUMBING LIMITED | Private company limited by shares | Dissolved |
| Tung Lui Plumbing Construction Limited | | Live |
| HO MING DECORATING & PLUMBING LIMITED | Private company limited by shares | Live |
| NEW UNIVERSAL AIR CON PLUMBING ELECTRICAL & DECORATION ENGINEERING LIMITED | Private company limited by shares | Live |
| FAT KEE ELECTRICAL & PLUMBING DECORATION WORKS LIMITED | Private company limited by shares | Live |
| WAH FAI PLUMBING & DRAINAGE COMPANY LIMITED | Private company limited by shares | Live |
| Hop Lee Drainage & Plumbing Limited | Private company limited by shares | Live |
| WAI HOO ELECTRIC & PLUMBING COMPANY LIMITED | Private company limited by shares | Dissolved |
| PACIFIC ELECTRIC & PLUMBING LIMITED | Private company limited by shares | Dissolved |
| TOMSON ELECTRIC & PLUMBING CO. LIMITED | | Live |
| Diligent Electrical & Plumbing Co. Pte Limited | Private company limited by shares | Live |
| Chung Bong Electrical & Plumbing Engineering Company Limited | Private company limited by shares | Live |
| FORTUNE PLUMBING & ELECTRICAL ENGINEERING LIMITED | Private company limited by shares | Live |
| WAI LUNG ELECTRICAL & PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| FORTUNE PLUMBING AND ELECTRICAL COMPANY LIMITED | Private company limited by shares | Live |
| YEE TAT PLUMBING ENG. LIMITED | Private company limited by shares | Live |
| SINHO PLUMBING & DRAINAGE ENG. LIMITED | Private company limited by shares | Live |
| PUI KEE PLUMBING & ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| MAN KEE PLUMBING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| TIN WAI PLUMBING & ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| TAK LEE PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| WAH KEE PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| BO KEE PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| YAT TIN PLUMBING & ENGINEERING LIMITED | Private company limited by shares | Live |
| YUI HO PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| K & F Plumbing Engineering Limited | Private company limited by shares | Live |
| ONE PLUMBING AND ENGINEERING COMPANY LIMITED | | Live |
| HIN LEE PLUMBING ENGINEERING LIMITED | | Live |
| Arrive Plumbing & Electrical Engineering Limited | | Live |
| BATIGOL PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| Chiu Hoi Plumbing Engineering Limited | Private company limited by shares | Live |
| Chong Hoi plumbing engineering Limited | | Live |
| CHONG FAT PLUMBING ENGINEERING COMPANY LIMITED | | Live |
| Chunyip Plumbing Engineering Co., Limited | Private company limited by shares | Live |
| Splendid Plumbing & Drainage Engineering Co., Limited | Private company limited by shares | Live |
| NEW DRAGON PLUMBING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| YEE TAT PLUMBING DRAINAGE ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| PO YIP PLUMBING & DRAINAGE ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| LEE HO PLUMBING & DRAINAGE ENGINEERING CO LIMITED | Private company limited by shares | Live |
| HON KEE PLUMBING & DRAINAGE ENGINEERING CO. LIMITED | Private company limited by shares | Live |
| EVEREST PLUMBING & DRAINAGE ENGINEERING LIMITED | Private company limited by shares | Live |
| FANDA PLUMBING & DRAINAGE ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Easy Plumbing Engineering Limited | Private company limited by shares | Live |
| Electric & Plumbing Pro Engineering Limited | Private company limited by shares | Live |
| Wah Fai Plumbing and Electrical Engineering Company Limited | Private company limited by shares | Live |
| WO KEE ELECTRICAL & PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| TAK CHUNG ELECTRICAL & PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| Splendid Electrical & Plumbing Engineering Limited | Private company limited by shares | Live |
| EURO PLUMBING & ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| FRIENDSHIP PLUMBING & ENGINEERING LIMITED | | Live |
| HANFIELD PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| Hang Chi Plumbing Engineering Limited | Private company limited by shares | Live |
| Hang Fu Plumbing Engineering Limited | Private company limited by shares | Live |
| HANG TAT PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| Harvest Plumbing Engineering Limited | Private company limited by shares | Live |
| Siu Hing Plumbing Engineering Limited | | Live |
| HING WAH PLUMBING AND DRAINAGE ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Hygenius Plumbing Engineering Limited | Private company limited by shares | Live |
| Jingdong Plumbing & Engineering Limited | | Live |
| KAMMON PLUMBING & ELECTRICAL ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| KENNETH PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Legend Plumbing Engineering Limited | Private company limited by shares | Live |