Construction Cost Calculator — Cost per Square Metre
This calculator computes construction cost from area and local rates: 150 m² at $400/m² ≈ $60,000 including materials and labour.
- Adjust for your project — free and instant.
Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.
How the construction cost calculator works
The construction cost calculator multiplies gross floor area by a market rate tier - $100-150 per ft² basic finish, $150-250 standard, $250-400+ premium - then layers in the two numbers that make budgets real: labor share and contingency. Labor runs 35-45% of direct cost, and a 10-15% contingency (15-20% for renovations) absorbs the surprises that otherwise become change orders. Worked example: a 200 m² (2,150 ft²) house at standard tier prices out near $430,000; adding 12% contingency brings the envelope to about $480,000 before land, permits and design fees, which always budget separately. Rates swing 20-30% between cities, so anchor the final number to local quotes from at least three builders.
- 1
Measure the space
Record the built area, quality level and contingency at the widest and longest points.
- 2
Enter the values
Type the measurements into the calculator and select your units.
- 3
Apply the formula
The tool computes Budget = Area × Rate × (1 + Contingency %) for your inputs instantly.
- 4
Add waste and order
Review the total with a 5-10% margin and round up to whole units.
Use Cases
Contractor quotations
Line-item construction cost checks before accepting any bid.
Renovation planning
Split construction cost between materials, labor and contingency.
Client presentations
Show construction cost breakdowns that clients can audit line by line.
Common Mistakes
Quoting from old prices
Forgetting permits and fees
Labor double-counted
FAQs
How much does it cost to build per square metre?
How do I estimate material quantities?
How much contingency should I add?
Does the calculator include finishing costs?
Tools that save hours on site
Laser measures, drills and layout tools — the most-used kit on build and finishing jobs.
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