432199Combined and other installation and maintenance of electrical and mechanical equipment
綜合及其他電器及機械設備安裝及保養
Why 6 digits?
HSIC subclasses are 6 digits. The first four match the international ISIC class; Hong Kong adds a two-digit local suffix for finer detail, especially across its import and export trade, so a code steps from a 4-digit class straight to a 6-digit subclass. More on the HSIC structure.
This subclass covers the installation and maintenance of various electrical and mechanical equipment that does not fall under more specific categories. It includes activities such as the installation and maintenance of diesel generator systems, filter systems, overhead equipment for railway electrification, power transmission towers, and other general-purpose electrical and mechanical fittings in buildings and structures.
This classification includes
- combination of works in Industry Sub-classes 432101 to 432106
- diesel generator system, installation and maintenance
- filter system, installation and maintenance
- overhead equipment for railway electrification, installation and maintenance
- power transmission towers, installation and maintenance
- other electrical and mechanical fittings at buildings and structures for general purpose of usage, installation and maintenance
Licences and approvals
What this activity needs to operate
Activities under this code trigger the following licensing regimes. Emerhub prepares and files each application on your behalf.
Registered Electrical Contractor (REC)
Electrical and Mechanical Services Department (EMSD)
Under the Electricity Ordinance (Cap. 406), any person or company carrying on business as an electrical contractor undertaking electrical wiring work on fixed low or high voltage electrical installations must register with the Director of Electrical and Mechanical Services. The contractor must employ at least one registered electrical worker of the appropriate grade for the work undertaken. Registration is renewable and applications can be made in person, by mail or online.
Official sourceVerified 2026-07-14
Offshore profits claim feasibility
MediumThis activity often requires physical presence in Hong Kong for installation and maintenance services. Contracts are typically negotiated with local clients, making it less likely to qualify for offshore treatment. However, some services may be performed outside of Hong Kong.
Business registration wording
Suggested business nature for this activity
English
INSTALLATION AND MAINTENANCE OF ELECTRICAL AND MECHANICAL
57/60 characters
Chinese 中文
電器及機械設備安裝及保養
12/30 characters
Industry statistics
How large is this sector in Hong Kong?
Official figures are compiled at industry level. These are for Construction (F), the industry this classification belongs to.
27,200
Establishments (2023)
195,800
Persons engaged (2023)
C&SD Annual Survey of Economic Activities 2023Verified 2026-07-14
Standard compliance
Compliance every Hong Kong company shares
Beyond anything specific to this activity, every Hong Kong company handles two-tiered profits tax, the annual return (Form NAR1) within 42 days of its incorporation anniversary, audited accounts, MPF enrolment for staff, and a company secretary. Emerhub runs all of it on your behalf.
See the full Hong Kong compliance calendarFrequently asked questions
Do I need a license for electrical installation?
Yes, specific licenses may be required for electrical installation work in Hong Kong. Ensure compliance with local regulations.
What are the tax implications for this business?
Profits generated from this activity are subject to Hong Kong profits tax unless qualifying for offshore treatment.
Can I perform maintenance work outside of Hong Kong?
Yes, maintenance work can be performed outside Hong Kong, but ensure contracts are structured to comply with local laws.
Incorporate in Hong Kong
Starting a combined and other installation and maintenance of electrical and mechanical equipment business in Hong Kong?
Emerhub incorporates your company, registers the business nature above with the IRD, files every licence application, and runs your company secretary and compliance calendar. You provide the documents; Emerhub handles every government interaction.
Start incorporation with Emerhub