The ratio of the total built up are of all floors (inclusive of walls) to the area of the land is known as Floor Space Index (FSI). It is also known as Floor Area Ratio (FAR).
Following spaces are not calculated in built up area, calculated for FSI :
- Parking area without enclosures and partitions, with clear height of 2.4 m and in case of slabs with beans, height should be less than 2.8 m.
- Spaces of hollow plinth with clear height less than 2.8 m at ground level without any walls or partitions.
- Interior opens spaces and ducts subject to maximum of 4 % of the total built up area.
- Basement used only for parking having clear height less than 2.8 m inclusive of beams.
- Security cabins up to 4 m2 built up area.
- Weather shed up to 0.6 m width.
- Stair case with landing width equal to or less than stair width.
- Lift, lift well with lift cabins and a water tank.
- Open to sky (OTS) spaces required under regulations.
