Unit Conversions
Users often enter heights in millimeters instead of meters (e.g., entering 2700 instead of 2.7m).
Area Calculations
Don't submit gross area (including parking, garden, etc.). Only include the actual built-up area.
HVAC System Selection
Adding HVAC systems for small residential buildings when not needed significantly increases costs.
Quality Consistency
Inconsistent quality selections across fixtures, finishes, and materials lead to unrealistic estimates.