| 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 |
| LEONG KEE PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| YAU LEUNG PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| LEUNG SIU KEE PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| Manpower Plumbing Engineering Limited | Private company limited by shares | Live |
| MARK PLUMBING ENGINEERING CO LIMITED | | Live |
| MING KEE PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| MING YAT PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| GO MING PLUMBING & ENGINEERING COMPANY LIMITED | | Live |
| MODERN ELECTRIC & PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| NewSky Plumbing & Electrical Engineering Company Limited | Private company limited by shares | Live |
| ONPLUS PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| POLARIS PLUMBING AND ELECTRICAL ENGINEERING COMPANY LIMITED | | Live |
| Strong Power Plumbing Engineering Company Limited | Private company limited by shares | Live |
| Wang Tong Plumbing Engineering Company Limited | Private company limited by shares | Live |
| WING TAT PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| PO WING PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| Wing Lee Plumbing Engineering Limited | | Live |
| WINNER PLUMBING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| Sun Yeung Plumbing Engineering Co., Limited | Private company limited by shares | Live |
| YUEN FAT PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| FU KEE METALS & PLUMBING ENGINEERINGS LIMITED | Private company limited by shares | Live |
| J&C PLUMBING ENTERPRISES LIMITED | Private company limited by shares | Live |
| FENGHUA SHANHE PLUMBING EQUIPMENT CO., LIMITED | Private company limited by shares | Live |
| Famrich Plumbing Engineering Limited | Private company limited by shares | Live |
| FAR EAST PLUMBING AND FIRE SERVICES ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Sun Grand Electrical Plumbing & Fire Engineering Limited | Private company limited by shares | Live |
| NINGBO PLUMBING AND HEATING FITTINGS LIMITED | Private company limited by shares | Live |
| SHANGHAI FLYING PLUMBING EQUIPMENT LIMITED | Private company limited by shares | Dissolved |
| Cheuk Fung Plumbing Engineering Company Limited | Private company limited by shares | Live |
| Ka Fung Plumbing Electrical & Air-Conditioning Engineering Limited | Private company limited by shares | Live |
| MING FUNG PLUMBING AND ELECTRICAL COMPANY LIMITED | Private company limited by shares | Live |
| Kam Fung Plumbing & Drainage Engineering Company Limited | Private company limited by shares | Live |
| Lok Fung Plumbing & Drainage Engineering Company Limited | Private company limited by shares | Live |
| MING FUNG PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| KIN FUNG PLUMBING WORK LIMITED | Private company limited by shares | Dissolved |
| Kin Fung Plumbing and Drainage Works Limited | Private company limited by shares | Live |
| Fung Ying Plumbing Engineering Company Limited | Private company limited by shares | Live |
| Fuya Plumbing & Electrical Engineering Co., Limited | | Live |
| GOLDEN SPRING PLUMBING FAUCET CO. LIMITED | Private company limited by shares | Dissolved |
| Great Power Plumbing Engineering Limited | Private company limited by shares | Live |
| HANSON AIR CONDITIONING PLUMBING & ELECTRICAL ENGINEERING LIMITED | Private company limited by shares | Live |
| EXCELLENCE PLUMBING HARDWARE LIMITED | Private company limited by shares | Dissolved |
| HARVEST METALS & PLUMBING LIMITED | Private company limited by shares | Live |
| HOP HING PLUMBING COMPANY LIMITED | Private company limited by shares | Dissolved |
| YEE HING PLUMBING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Tai Hing Plumbing Limited | Private company limited by shares | Live |
| Wing Hing Plumbing Limited | Private company limited by shares | Live |
| Amazing Plumbing Engineering (HK) Co., Limited | | Live |
| JIUMU PLUMBING (HK) LIMITED | Private company limited by shares | Live |
| DONGHAI METER & PLUMBING (H.K.) CO. LIMITED | Private company limited by shares | Live |
| YEE HONG KEE (PLUMBING) COMPANY, LIMITED | Private company limited by shares | Live |
| HONG KONG FEDERATION OF PLUMBING AND DRAINAGE LIMITED | Company limited by guarantee | Dissolved |
| HONG KONG INSTITUTION OF PLUMBING AND DRAINAGE LIMITED -THE- | Company limited by guarantee | Live |
| HONG KONG PLUMBING & DRAINAGE WORKS LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Plumbing and Drainage Works Limited | Private company limited by shares | Live |
| Hong Kin Plumbing Engineering And Renovation Limited | | Live |
| EURO PLUMBING HONG KONG LIMITED | Private company limited by shares | Dissolved |
| Promise Plumbing Hong Kong Company Limited | Private company limited by shares | Live |
| HONG KONG PLUMBING PROMOTION LIMITED | Private company limited by shares | Live |
| HOTI (HONGKONG) PLUMBING LIMITED | Private company limited by shares | Live |
| HUASHENG PLUMBING (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| HUICHENG PLUMBING EQUIPMENT (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| KINGSHARK PLUMBING IMPORT & EXPORT LIMITED | Private company limited by shares | Live |
| DOLPHIN PLUMBING INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |