FSI ( Floor Space Index) or FAR (Floor Area Ratio) is the ratio of total built up area divided by the plot area.
FSI = Built Up Area / Plot Area
FSI means that how much area you can build up in a given plot.
Built Up Area= FSI x Plot Area
FSI is decided by the Directorate of Town And country Planning. It varies from city to city and even can vary into different localities of same city.
FSI may also depend on the type of construction::
- Ordinary Building – This has maximum upto 2 floors and less than 4 dwelling units or flats
- Special Building – Your construction will fall into this type when it is more than 2 floors and not more than 4 ,
- Multi-storeyed Building – These constructions are exceeding 4 floors
We also have Industrial Building, Group housing constructions, their FSIs will vary as well.
Example of FSI calculation: For example if your plot area is 4000 sq feet and FSI is 1.5.
Built p Area = 4000x 1.5= 6000 Sq ft
Apart from FSI you also need to comply with other regulations of local authorites like
- Minimum plot extent area
- Front, back , side and rear setback
- OSR and parking space.
- Additionally if your plot is nearby airport you may have restriction regarding height of the building.
You can check the FSO fro your area on the state Government’s official website.
What is Premium FSI?
Premium FSIs are allowed as exception as permissible deviations.
You need to pay premium to the State Government to avail the Premium FSI, Extent of Deviation of Premium FSI will depend on the width of adjoining road. You should have minimum 30 feet road to avail the Premium FSI.
Some Examples::
- 30 – 40 Feet Road Width – 20 % Premium FSI
- 40 – 60 Feet Road Width – 30 % Premium FSI
- more than 60 Feet Road Width – 40 % Premium FSI
Example :: if you have a 40-60 feet wide adjoining road, you can avail the Premium FSI up to 30%. In the above-mentioned case the Built Up Area ca be calculated as ::
Built Up Area= 4000 x 1.5 x (30%) + (4000 x 1.5) =4000 x 1.5 x 0.3 = 1800 + (4000 x 1.5)= 7800
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