A type of rough estimate used to calculate construction costs.
The approximate quantity method is a method of calculating the construction cost by setting up items along the elements of the building, multiplying the quantity by the unit price of each item, and adding up the amounts calculated for each item.
This method is used at the stage of basic planning and basic design, when the outline of the building shape and specifications of the project have been studied to some extent, based on the outline of the plan and design drawings.
The characteristic of the approximate quantity method is that decisions such as which items to include in the breakdown sheet, to what extent construction work is included in the items included in the breakdown sheet, how to determine the quantity, and what units to use are made based on the experience and thinking of the person doing the calculation.
Therefore, if the same project is carried out by a person with different experience or way of thinking, the items, quantities, units, etc. recorded in the breakdown sheet will be different, and there may be a large difference in the construction cost obtained.
Unlike the cost per square meter method and the unit method, the cost per square meter method requires a great deal of experience and knowledge to use, but the results obtained by experienced personnel can be expected to be highly accurate.
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