
FSI Full Form: Meaning, Calculation And Importance in Real Estate Property buying is never easy as it is a life changing decision that involves a lot of capital investment. This particular decision has a great impact on present and future and the entire process of buying property can get overwhelming as the world of real estate is a complex one.
It is essential to understand and gather relevant knowledge of this sector during buying process. Whether you are buying a new apartment, planning to purchase a land area or building your own house, there are many terminologies, rules and regulations that you will have to consider and keep in mind while you make the final decision.
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To make this herculean task a little easier and comfortable, a smart buyer will always get acquainted with the concepts, terms and abbreviation used in this sector.
What Is FSI?
The most common term that comes in the use but creates a lot of confusion is FSI. FSI full form stands for Floor Space Index which is also known as FAR i.e Floor Area Ration. To understand in a better way, FSI can be stated as the maximum permissible floor area that a builder can build on a particular plot/piece of land.
In simple words, FSI is the ratio of building floor covered area to area available on the land. This value of FSI varies from one place to another under the rules and regulations set by the city’s concerned authority.
FSI = Total Covered Area on All Floors/Gross Plot Area
Let’s understand with an example, if a plot of land measures about five hundred square meters, the permissible FSI is 1, then the construction of five hundred square meters will be allowed on this plot. This is just an example as this number can change accordingly to the allowable Floor Space Index.
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What Impacts FSI?
FSI gets impacted by many things of a building such as the size of the plot, type of the building, the location of the plot (city zone) and all the basic necessary facilities that can be made available for the building construction, etc.
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For example, the FSI of land may be dependent majorly on the location. In old and developed part of the city FSI can be different than in developing areas for the permissible FSI. The needs and development of a city can revise the FSI for the land and this FSI number defines the potential of the plot and its commercial value.
As per the rules and regulations of the respective city, the calculations of the actual FSI of a building can turn out to be a difficult one as there are many areas such as basements, shafts, lifts, service areas etc. sometimes are counted and not as a part of FSI.
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If we look in Mumbai, the basement parking area and stilt parking does not count as a part of FSI. Correspondingly, the rules may be different for every city and according to the thorough study of the city’s laws and by-laws is required to calculate this accurately.
It is always a milestone when you make the final decision of buying property. Whether you are building your first home or making a prudent financial investment, it will always require a significant amount of money for the investment.
So, it is crucial to understand these factors and the fine detailing before finalising the deal. Take a well-versed decision so you don’t regret in future and at each step by educating yourself to ensure that nothing threatens this significant decision.

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