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Calculating the Building Coverage Ratio

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Calculate the building coverage ratio, which is the ratio of the building area to the lot area.
Site Area
m2
Building Area
m2
Building Coverage Ratio %
The building coverage ratio is calculated by rounding up at the third decimal digit (retaining two decimal places).

Formula for Calculating the Building Coverage Ratio


  • Building Coverage Ratio (%) = Building Area ÷ Site Area × 100



As a general rule, buildings with a building area exceeding the specified building coverage ratio may not be constructed; however, there are cases where the building coverage ratio is relaxed, such as for fire-resistant buildings within fire prevention zones or on corner lots designated by a specific administrative agency.

Epexegeses

【建築面積】
建築物を真上から見たとき、建築物の壁または柱の中心線で囲まれた部分の面積です。
軒・ひさし・はね出し縁(バルコニー)などが、その中心線から1メートル以上突き出ている場合は、その先端から1メートルを引いた残りの部分を建築面積に算入します。

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Calculating the Building Coverage Ratio | Keisan