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Floor Space Index or FSI
The Tamilnadu Government has Notified the new Development and Building Rules, in 2019. It is applicable for the whole of Tamilnadu. Its known as Tamilnadu Combined Development and Building Rules, 2019.
These Rules categorise buildings as High Rise and Non High Rise buildings. Buildings with height upto 18.30 Meters are Non High Rise Buildings. For these Non High Rise Buildings, the maximum Floor Space Index allowed is 2.
Calculation of Constructable Area
FSI allowed is 2. This means, the total plinth area one can construct is twice the area of the plot. For example, if the plot area is 2400 sqft, the total plinth area of all floors that can be constructed in that plot can be upto 4800 sqft. There are exemptions for some constructions while computing the Floor Area. Later in this Article we give the list of exemptions.
The calculation of FSI is not that simple. The road width, plot width and height of the buildings also decide the constructable area. This is so because of the need to provide Set Back Spaces around the building.
For details about Set Back Spaces, click HERE. As a result, achieving the allowed FSI may not be possible many times.
Definition of FSI
Exemptions from FSI Norms
Achievable FSI Affects Value of the Property
Benefits of Increased FSI
Apart from allowing new constructions to build more floor area,as a result of this higher FSI,(earlier the FSI was 1.5 only), redevelopment activities are on the increase. Buildings/apartments constructed years ago, with old FSI norms are being redevloped now. This is a win win situation both for the occupants/owners as well as for the promoters.