This is a type of rough estimate used to calculate construction costs and is the most widely used method in practice because it can be used easily by anyone once learned. It is also referred to as the unit price per square area method.
The unit price per square meter method is a method of calculating construction costs by setting the unit price per square meter of the building to be constructed and multiplying it by the floor area of the building.
The unit price per square meter is generally determined based on the unit cost of construction projects similar to the target building, taking into account the rate of increase in prices since the time of the construction contract for similar projects.
The feature of this method is that the construction costs can be calculated at a stage where the outline of the target building such as region, building use, scale, structure, building grade, etc. are determined, even when design drawings and specifications do not exist. On the other hand, the accuracy of the results obtained by this method is generally rough and contains significant errors.
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