Construction work grade (Circular 34/2026/TT-BXD)
Choose the structure type and enter its size. The tool checks each criterion of Annex II Table 2, takes the highest grade, then compares it with the Annex I grade (if the work is listed in Annex I).
The work is Grade II (Buildings and building-type structures).
Preliminary results
| Step | Result | Basis |
|---|---|---|
| Height22 m | Grade III | Annex II Table 2 item 2.1 |
| Storeys above ground6 | Grade III | Annex II Table 2 item 2.1 |
| Total floor area12,000 m² | Grade II | Annex II Table 2 item 2.1 |
| Largest structural span30 m | Grade III | Annex II Table 2 item 2.1 |
| Basement levels1 | Grade III | Annex II Table 2 item 2.1 |
| Underground depth4 m | Grade III | Annex II Table 2 item 2.1 |
| Work gradeHigher of Annex I and Annex II | Grade II | Article 2(2), Circular 34/2026 |
Annex II Table 2 thresholds: Buildings and building-type structures
| Criterion | Special grade | Grade I | Grade II | Grade III | Grade IV |
|---|---|---|---|---|---|
| Height (m) | > H* | > 75 ÷ H* | > 28 ÷ 75 | > 6 ÷ 28 | ≤ 6 |
| Storeys above ground | > 50 | 25 ÷ 50 | 8 ÷ 24 | 2 ÷ 7 | 1 |
| Total floor area (m²) | — | > 30 000 | > 10 000 ÷ 30 000 | 1 000 ÷ 10 000 | < 1 000 |
| Largest structural span (m) | > 200 | 100 ÷ 200 | 50 ÷ < 100 | 15 ÷ < 50 | < 15 |
| Basement levels | — | ≥ 5 | 2 ÷ 4 | 1 | — |
| Underground depth (m) | — | > 18 | 6 ÷ 18 | < 6 | — |
H* = 150 m for buildings of groups F1.2, F1.3, F4.2, F4.3 and mixed-use buildings (QCVN 06:2022/BXD 1.1.3); 200 m for other buildings. Floor area in m². Highlighted cells are the criteria your work meets.
What the grade is used for
- Deciding which authority appraises the feasibility study and design and issues the building permit; a project with several main works takes the highest grade (Article 3).
- Setting the capability requirements for survey, design, construction and supervision firms and individuals.
- Quality management, acceptance, warranty and maintenance of each work; linear projects are graded work by work.
- Projects approved, or validly submitted for appraisal, before 01/07/2026 keep the grade under the previous rules (Article 5).
Frequently asked questions
A one-storey factory 12 m high with a 60 m span: which grade?
Height 12 m and one storey give grades III and IV, but a 60 m span falls in 50 to under 100 m, so the work is grade II.
A 20-storey apartment block with 2 basements?
8–24 storeys is grade II and 2 basements is also grade II; if the total floor area exceeds 30,000 m² it becomes grade I.
How do Annex I and Annex II differ?
Annex I grades by importance and capacity for each type of work (civil, industrial, infrastructure, transport, agriculture). Annex II grades by structural size. If a work is in both, the higher grade applies.
Is the grade relevant to fire safety?
Yes. Together with use, height and volume, the grade drives the fire safety design appraisal file and the fire-resistance of the structure. See the Fire safety advisor tool to check whether appraisal is required.
Applicable documents
Documents in force at the update date, applied from 1 July 2026. TCVN standards are mandatory only when a QCVN refers to them; where they differ, the QCVN prevails.
| Code | Title | Effective from | Status |
|---|---|---|---|
| TT 34/2026/TT-BXD | Cấp công trình xây dựng | 01/07/2026 | In force |
| QCVN 06:2022/BXD + SĐ1:2023 | An toàn cháy cho nhà và công trình | 16/01/2023 | In force ⚠ |