Classification of Construction Works by Grade under Decree 06/2021/NĐ-CP
Classification of construction works by grade is a key starting point in construction project management. It determines the level of documentation, contractor capacity, appraisal authority and acceptance procedures.
1. Concept and importance in project management
A construction grade reflects the scale, technical complexity and significance of a work. Correctly determining the grade helps to:
- Select appropriate contractor capacity for design, construction and supervision.
- Identify the proper authority for appraisal and approval, as well as cost, quality and schedule management requirements.
- Clarify the mandatory legal documents and technical standards that must be applied.
- Avoid violations in project formulation, appraisal, approval and bidding.
In simple terms: the grade is like the “class” of a building. The more important and complex the work is, the higher its grade.
2. Legal basis
The classification of construction works by grade is based mainly on:
- Decree 06/2021/NĐ-CP on management of construction quality, construction and maintenance of works.
- National and sectoral technical regulations and standards applicable to each type of work.
- Other guidelines for civil, industrial, transport, hydraulic and infrastructure works.
3. Five grades of construction works
Under current regulations, construction works are classified into five grades:
| Grade | Key features | Management implications |
|---|---|---|
| Special grade | Very large scale, special function, national-level impact, very high safety and technical requirements. | Strict appraisal and approval procedures; contractors and experts must have exceptional capability. |
| Grade I | Large-scale works that play an important role for a region, locality or sector. | Subject to many mandatory standards; contractors must have strong experience and capacity. |
| Grade II | Medium-scale works, common in many civil, industrial and infrastructure projects. | Account for a large proportion of practical projects; clearly defined requirements but less stringent than grade I. |
| Grade III | Smaller works, with moderate technical complexity. | Suitable for small and medium-sized contractors; simpler procedures. |
| Grade IV | Very small scale, simple structures, low risk. | Streamlined procedures, shorter timelines, lower technical requirements. |
4. Main criteria for determining the grade
In practice, the grade is determined using a combination of criteria. The most important include:
4.1. Height and number of storeys
- The taller the building and the more storeys it has, the higher its grade tends to be.
- For example, high-rise residential buildings above certain height thresholds are usually classified as grade I or even special grade, depending on detailed rules.
4.2. Floor area
- The greater the total floor area, the higher the grade.
- This includes usable floor area, technical areas, ancillary spaces and related infrastructure.
4.3. Structural capacity and configuration
- Works with large loads, long spans, complicated structures or special materials are classified at higher grades.
- Works using special structural solutions (e.g. long-span prestressed structures) often require a higher grade.
4.4. Function and overall importance
- Works serving security, defence, critical infrastructure or central control functions are usually special grade or grade I.
- Small detached houses for a single family are usually grade III or IV, depending on the detailed criteria.
4.5. Type of construction work
Each type of work has its own detailed criteria, for example:
- Civil buildings: height, number of storeys, floor area, occupancy, fire safety, etc.
- Transport works: load, traffic volume, bridge span, road length and class, etc.
- Industrial buildings: production capacity, process characteristics, explosion/fire risk, etc.
- Technical infrastructure: scale of power, water supply, wastewater treatment and solid waste systems.
5. Illustrative examples
| Type of work | Example | Typical grade (for reference) |
|---|---|---|
| High-rise apartment building | 40 storeys, about 120 m high, with 3 basement levels. | Usually grade I, subject to specific criteria. |
| Industrial factory | Steel-frame workshop, 10,000 m², large span. | Often grade II. |
| Government office | Headquarters of a provincial People’s Committee, high security requirements. | Usually grade I or special grade. |
| Detached house | Three-storey house, total floor area under 250 m². | Typically grade IV or grade III (depending on criteria). |
| Bridge or urban flyover | Urban flyover with multiple ramps and high traffic load. | Often grade II or grade I. |
6. Conclusion
Classification of construction works by grade is a mandatory and essential step in construction project management. Determining the correct grade at the beginning helps to:
- Formulate, design, appraise and approve the project in compliance with regulations.
- Select contractors with appropriate capacity and experience.
- Reduce legal, technical and safety risks throughout the project life cycle.
*This article provides a simplified explanation for study and general project management. For actual projects, always refer directly to Decree 06/2021/NĐ-CP and current detailed guidance.*
