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Industry Code 4291 Construction of hydraulic structures, updated according to Decision 36/2025/QD-TTg. To learn more about the details of industry code 4291, please refer to this article by VN Law Firm!

1. What is a business industry code?

Business industry codes are a series of numbers encoded to represent a specific business line. Organizations and individuals, when preparing business registration documents, must use this business industry code table for registration. Level 4 industry codes (4 digits) are used for business registration.

The Vietnam Standard Industrial Classification (VSIC) system, issued under Decision 36/2025/QD-TTg, has a hierarchical structure with 5 levels, from general to detailed:

Level	Name	Coding	Quantity
Level 1	Level 1 Economic Sector	1 letter (from A to V)	22 sectors
Level 2	Level 2 Economic Sector	2 digits (following Level 1)	87 sectors
Level 3	Level 3 Economic Sector	3 digits (following Level 2)	259 sectors
Level 4	Level 4 Economic Sector	4 digits (following Level 3)	495 sectors
Level 5	Level 5 Economic Sector	5 digits (following Level 4)	743 sectors

Example of industry code structure: Taking the food manufacturing industry as an example:

Level 1: C (Processing and Manufacturing Industry)
Level 2: 10 (Food Processing and Manufacturing)
Level 3: 107 (Manufacture of other food products)
Level 4: 1075 (Manufacture of prepared meals and dishes)
Level 5: 10751 (Manufacture of prepared meals and dishes from meat)

2. Regulations on Industry Code 4291 Construction of hydraulic structures

Industry Code	Industry Name
4291	Construction of hydraulic structures

Industry Code 4291 Construction of hydraulic structures

This group includes:

– Construction of hydraulic structures such as:

+ Waterways, ports and river structures, tourist ports (docks), sluices, etc.,

+ Dams and dikes.

– Dredging of waterways.

Excludes: Project management related to civil engineering construction is classified under group 7110 (Architectural and related technical consulting activities).

3. Suggested ways to record Industry Code 4291 Construction of hydraulic structures

– When registering a business establishment, when notifying changes to business lines or when requesting a change to a Business Registration Certificate, the business founder or enterprise selects the four-digit economic sector in the Vietnam Standard Industrial Classification system to record the business line in the enterprise registration dossier. The business registration authority guides, verifies, and records the enterprise’s business lines in the National Enterprise Registration Database.

– For conditional business lines regulated by other legal documents, the business line shall be recorded according to the sector specified in those legal documents.

Suggested ways to record Industry Code 4291 Construction of hydraulic structures:

Case 1: General

Industry Code	Industry Name
4291	Construction of hydraulic structures

Case 2: Detailed

Industry Code	Industry Name
4291	Construction of hydraulic structures Details: Construction of waterway transport works, hydropower works; dredging of channels, riverbeds, and berths

Case 3: Detailed

Industry Code	Industry Name
4291	Construction of hydraulic structures Details: Construction of civil engineering works (CPC 513)

Case 4: Detailed

Industry Code	Industry Name
4291	Construction of hydraulic structures Details: Construction of medium and small-scale hydropower and irrigation works;

Note: Depending on each specific industry code and business line, as well as local regulations, it may be necessary to provide detailed information for the level 4 industry code or commit to operating according to regulations.

4. Business line change services for companies and enterprises at VN Law Firm

Business line change services for companies and enterprises at VN Law Firm help clients save a lot of time and effort. With VN Law Firm, you will be provided with business line change services for companies and enterprises, including:

Consultation on procedures for changing and supplementing business lines;
Advising clients on preparing necessary documents;
Drafting and submitting application for changing and supplementing business lines of the company/enterprise on behalf of the client at the Business Registration Office;
Monitoring the application, supplementing or amending the application (if any) as required by the specialist;
Performing the procedure for publishing enterprise registration information on the Information Portal;
Handing over the certificate of business line change;
Guiding clients on procedures to note after changing business lines…