The Floor Area Ratio (FAR) refers to the ratio of a building’s gross floor area to the total size of the land are available upon which it is to be constructed.
The other common names for the FAR is Floor Space Ration (FSR) or Floor Space Index (FSI) that depicts the relationship between the total usable floor space in a building and the total area of the property for sale on which the building is going to be taking shape.
The FAR of an area is established by the local municipal corporations that basically controls the height of buildings on the basis of the size of the land area. The various factors which are governing the FAR of an area include the factors like density of the population, availability of open space, the impact of the project on the environment and resistant to a natural calamity.
The Gross Floor Area (GFA) is an important inclusion for the calculations of FAR which is the total built-up area in a building, including the external walls.
GFA includes the combined area within the perimeter of the outer walls of the home for sale and is measured from the exterior faces of the building. Don’t get confused as it is different from the net floor area i.e. the actual occupied area that does not include open corridors, stairways, toilet rooms, mechanical rooms and closets.
How To Do Calculation Of The FAR?
The FAR or FSI defines the ratio of the cumulative area of all the floors in a residential project for sale or the commercial to the size of the land on which that structure will be constructed.
So, the formula to calculate FAR is –
Floor area ratio = (Total enclosed area across floors of buildings, Gross Floor Area) / (Area of the plot)
To apprise let’s understand with an example,
Gross floor area of a residential project for sale across three floors is 200 sq m and the plot area is 100 sq m,
Then FAR = 200/100 = 2
The FSI of two indicates that the total floor area of a building remains two times the gross area of the plot on which it is built.
Similarly, on a plot of land of 100 sq m, having an FSI of 1, one can build 1 x 100 sq m of built space.
Suppose, one constructs 40 sq m on the ground floor, another 40 sq m on the first floor, then they can build only the remaining 20 sq m on the second floor since the total built floor space should not exceed 100 sq m.
What Are The Benefits Of Floor Area Ratio?
There are some rules and regulations with respect to FAR that helps in keeping the construction in check. It will also ensure the structural safety of a building, to some extent at least. In case of absence of FAR/FSI rules, there will be more chances of unauthorised constructions will increase. There is a clear demarcation between open spaces and built spaces and it will help authorities to foster stable, planned growth of the real estate for sale. Thus, these little terms can be useful when you are looking for an apartment for sale in a particular location.