Construction Cost Calculator
Estimate the total construction cost of a building project based on area, cost per square meter, and additional expenses.
Fill in the fields above and click Calculate to see your results.
How to use
Enter your total floor area (sum of all floors, not the land area), the market construction rate per m² for your build standard, plus foundation and interior finishing budgets. Set a contingency of 10–15% — surprises are the rule in construction, not the exception. The calculator returns structural cost, base total, the grand total with contingency, and your effective all-in cost per m².
Get the per-m² rate from at least two recent local quotes, and confirm what it includes: rough build only (phần thô) versus turnkey (chìa khóa trao tay) rates differ by 40–60%. The effective cost per m² is your best number for comparing contractor bids on equal footing.
How it's calculated
Structural Construction Cost
Cost of the main structure based on area
Base Total Cost
Total before contingency reserve
Total Estimated Cost
Full project cost including contingency reserve
Effective Cost Per m²
All-in cost per square meter including all expenses
Examples
3-bedroom house in Vietnam
- Total Floor Area:150
- Construction Cost Per m²:8,000,000
- Interior Finishing Cost:100,000,000
- Foundation & Site Preparation:50,000,000
- Contingency Reserve:10
Result
- Base Total Cost:1,350,000,000
- Total Estimated Cost:1,485,000,000
- Structural Construction Cost:1,200,000,000
- Effective Cost Per m²:9,900,000
The structure alone costs 1.2B₫, but foundation, finishing, and a 10% reserve lift the realistic budget to 1.49B₫ — an effective 9.9M₫/m², about 24% above the headline rate. Budgeting only the per-m² rate is how projects run out of money at the finishing stage.
Compact townhouse, 2 floors
- Total Floor Area:80
- Construction Cost Per m²:7,000,000
- Interior Finishing Cost:60,000,000
- Foundation & Site Preparation:40,000,000
- Contingency Reserve:5
Result
- Base Total Cost:660,000,000
- Total Estimated Cost:693,000,000
- Structural Construction Cost:560,000,000
- Effective Cost Per m²:8,662,500
A modest 80m² build lands at 693M₫ all-in, or about 8.7M₫/m². The 5% contingency here is optimistic — on tight urban sites with shared walls and difficult access, 10–15% is the safer assumption.
Industry Benchmarks
| Metric | Typical Range |
|---|---|
| Vietnam 2025 all-in rates: rough build 3.5–5M₫/m², standard turnkey 7–10M₫/m², high-end 12M₫+/m². Provinces run 10–20% below the big cities. | 7000000–10000000 ₫/m² |
Data source: VN residential contractor market rates 2025 (HCMC/Hanoi)
Frequently Asked Questions
What is included in construction cost per m²?
Why add a contingency reserve?
How do I calculate floor area for a multi-storey house?
How can I keep construction costs under control?
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