In real estate advertisements, you will often see the terms "building footprint," "total floor area," and "building area."These terms may look similar, but they refer to different concepts, and understanding them correctly is the first step in planning a home.This article explains the meaning of each term and how it is calculated in a clear way.
What do the area terms used in real estate ads mean?
Building Footprint
This is the area measured by the outer perimeter of the building when viewed directly from above (horizontal projection area).In general, this corresponds to the first-floor area, but if the second floor is larger, the second-floor area becomes the building footprint. It is used to calculate the building coverage ratio.
Total Floor Area (Building Area)
This is the sum of the floor areas of all floors in the building.In buildings with two or more stories, it is larger than the building footprint. The term "building area" is also used here with the same meaning as total floor area. It is used to calculate the floor area ratio.
Land Area (Site Area)
This is the same as site area, meaning the area of the land when viewed directly from above.On sloped land, it may be smaller than the actual area.
How are the building coverage ratio and floor area ratio calculated?
| Item | Formula | Meaning |
|---|---|---|
| Building Coverage Ratio | Building Footprint ÷ Land Area | The horizontal proportion of the building relative to the land |
| Floor Area Ratio | Total Floor Area ÷ Land Area | The spatial proportion of the building relative to the land |
Bothhave upper limits set according to the zoning district, and buildings that exceed those limits cannot be constructed.
Why does the building area differ depending on the document?
Because the calculation method differs depending on the purpose of use.
Statutory Floor Area
This is the area defined under the Building Standards Act and is used in building permit applications.
Floor Area Counted for FAR
This is the area in which shared spaces and basement portions may be excluded under certain conditions.
Registered Floor Area
This is the area based on the Real Estate Registration Act. It is generally the same as the statutory floor area, but it also has its own specific rules.
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Frequently Asked Questions (FAQ)
Q. What is the difference between building footprint and total floor area?
The building footprint is the area of the building when viewed directly from above, while the total floor area is the sum of the floor areas of all floors. In buildings with two or more stories, the total floor area is larger.
Q. Is a balcony included in the total floor area?
Generally, it is not included. However, if the depth is 2 meters or more, the excess portion is counted.
Q. Where can I check the upper limits for building coverage ratio and floor area ratio?
You can check the upper limits for each zoning district with your local urban planning department or on its website.
