Calculation of Floor Area Ratio
Calculates the building’s floor area ratio. It supports relaxation conditions for the floor area ratio when basements or in-building garages are present.
The floor area ratio is calculated by rounding up at the third decimal digit (retaining two decimal places).
- Formula for Floor Area Ratio
- Floor Area Ratio (%) = Total Floor Area ÷ Lot Area × 100
- Conditions for Floor Area Ratio Relaxation
- Basements: Excluded from the floor area ratio up to a limit of 1/3 of the total floor area used for residential purposes
- Garage within the building: Excluded from the floor area ratio up to 1/5 of the total gross floor area
- Excluded from the floor area ratio (total floor area)
- Lofts: ceiling height of 1.4m or less, loft area no greater than 1/2 of the floor area directly below, and where the ladder is not fixed
- Verandas and balconies: Areas projecting no more than 2 m from the exterior wall
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