FSI (Floor Space Index) - Calculation, Formula, Concept with Example (Hindi) - YouTube

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When you are constructing a building, can you add unlimited floors to it?

Or can you make it as high as you want?

Can you cover the plot 100% by construction?

You can get answers to all these questions if you can understand what is Floor Space Index?

So in this video, I have talked in detail about what is Floor Space Index?

How to do its calculations?

What is the difference between Floor Area Ratio and Floor Space Index?

And How is the Floor Area Ratio decided of any area or any city?

Watch this video from beginning to the end

So that you won't miss any point

let's go straight to the blackboard

So we will understand what is Floor Space Index in this video

Whenever you want to construct a building

on any plot, So how much can you make the total covered area

Total covered area

You can find this by FSI

Now this FSI won't have to be calculated by you. This is generally,

decided by the government.

The urban planning department is the one

that decides any area's FSI or any locality's FSI

So we will also understand how is it determined and on what factors does it depend

But before that, we should understand the concept of Floor Space Index

If we talk about the definition, then Floor Space Index is the ratio of a building's total covered area

relative to the size of the plot on which it is built

So the formula for FSI is the Total covered area of the building

of all floors

divided by total area of the plot

So if understand it through a example

Assume there is a building with 5000 sq. ft. on a floor

The covered area of a single floor is 5000 sq. ft.

And assume there are 4 floors similar to this one

So you will find it out by multiplying it, which will become 20000 sq. ft.

And assuming the area of the plot is 10000 sq. ft.

So we divide by it, which gives our FSI as 2

So our FSI is 2

But this FSI is not to be calculated by you

The main objective of FSI is to find out the total covered area

So the total covered is found out by

multiplying FSI with Plot area

So assuming you have to make a building, then how much can we make the total covered area

this can be known by FSI

Since you would know your plot area

and additionally, you would know how much FSI is allowed in that area

So by multiplying by it, you will find the total covered area

That is, the total covered area that can be made in the building

So if we look for the total covered area in our example

Assuming our FSI is 2 of any area and plot size is 10000 sq. ft.

So our total covered area would be 20000 sq. ft.

Now we will understand through an example how can you make this 20000 sq. ft.

For example, if we look here, there are two FSI's

Assume the total plot area is 10000 sq. ft.

Assuming it is 10000 sq. ft.

and you covered it 100%, so you will do 10000 x 2

You made this much built-up space, so your FSI will be calculated as 20000

divided by 10000, which will give 2

The other option you have is to leave 50% space empty

Assuming you left the open area of 5000 sq. ft.

and you made 4 floors in the remaining 5000 sq. ft.

So, when you will calculate FSI, then 5000 x 4

This would be your built-up space

divided by 10000 sq. ft.

of the plot area, which would be the total plot area if calculated

Even so, your FSI would be 2 only

So in this case, you saw that we did a 100% coverage

And in this case, we covered 50%,

And in both cases, you are complying with two FSI's.

Now taking another example, let's assume an area having 0.5 FSI

So that means, you can't make a very big building in that area, you can't make a big covered area

So that means, the government is not promoting vertical development in that area.

For example, if you have the same 10000 sq. ft. plot and you cover it 50% only

Assume you leave 5000 sq. ft. empty and make 1-story 5000 sq. ft.

Even so, your FSI would be 0.5

you will divide the built-up space of 5000sq. ft. by total area 10000 sq. ft.

So 0.5 will be obtained

and the other option you have is if you

leave 75% empty

So assume you left 7500sq. ft. empty

Then you can make two floors of 2500sq. ft. from the remaining 25%

So in this case also, 2500 x 2

divided by 10000

will give you the same 0.5 FSI

Now if we talk about our previous example

Assuming you can make the total covered area of 20000sq. ft.

then it is not necessary that you can cover the plot area 100%

because you have to follow other regulations also

For example, you may have to leave set back in some area

you may have to leave space in the front

you may have to leave space in the sides for driveway

So we will talk about these regulations also

but before I will tell you about the term which is used alongside Floor Space Index

Which is FAR Floor Area Ratio

Floor Area Ratio

This Floor Area Ratio is the same as FSI

But sometimes Floor Area Ratio is denoted as a percentage

For example, if I talk about Delhi

So the FAR in Delhi varies from 120 to 400

Which means it is 120%

and this is 400%

So this means it varies from 1.2 to 4

So FAR in many areas is denoted as a percentage

And FSI is a single number, a single ratio

For example in Bangalore, FSI is used

The FSI of Bangalore varies from 1.75 to 3.35

These higher values of FAR and FSI are usually in areas with very good infrastructure

They may have metro connectivity

Or it may have high growth corridors and high population density

In such areas, FAR and FSI values are kept high.

So I think you must have understood a broad concept that what is the concept of Floor Space Index

how is it calculated

And how is it compared to FAR

Now we will talk about the regulations except FSI which you have to follow when you are constructing a building

You have to follow all the zoning and planning regulations in your locality

The first one in it is FSI

you have to follow the FSI and FAR in the area.

Aside from FSI, you have to follow other regulations also like there are setback requirements such as

You would have to leave some space in the front, some in the back

You may have to leave some space in the sides for driveway

So you should know

then how much ground coverage is possible, in how much area can you construct your building

It can be required.

then, how much area is to be left for parking?

There are height restrictions at some places

For example, if we talk about Delhi

In residential areas, there is a height restriction of 15 metes up to date

So you should know all these regulations when you do the construction of a building

If you are making a very big building, then you should consult your architect, he would know these regulations

So now we will talk about how Floor Space Index is determined and on what factors does it depend

So, FSI depends upon the current population of the city

Assume that the population is very high

So you also have to keep the FSI high

And assuming the population has been growing in any area

assuming population growth is very high

A lot of jobs are being created and industrialization is happening in any area

So the government can keep FSI high at such a place.

then assuming the infrastructure is quite high at a place

So the FSI can be high there as well

but assuming a place with low infrastructure

then FSI shouldn't be high at such a place

FSI should be low at that place, otherwise

transportation network, power, and water infrastructure would be under stress as well.

So, in a nutshell

If your FSI increases, then population density of that area increases as well

what does an increase in population density mean

it means that more people will live in less space

since more people are there, then obviously it would put more stress on infrastructure as well.

And this is why it becomes important to improve the infrastructure of that area

the other meaning for an increase in FSI is

that the vertical development is being promoted there

that means the government is trying to make high buildings

instead of spreading the development and making smaller buildings in the larger area

So when FSI is high, then vertical development is promoted there

Like in Bombay, FSI is very high in some areas

Cities like New York have a very high FSI

FSI is very high in some areas of London

there you will see very tall buildings are built

but the population density of that place increases a lot

and the infrastructure suffers a crunch

So in those areas, it becomes evident to improve the infrastructure.

So I think after watching this video, you would have gotten the whole idea of the Floor Space Index and Floor Area Ratio

If you have some comments, then do comment below and if I missed some points then you can add them also

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