** **

The ratio of
the permissible built-up area (or floor area) of the building to the area of
the plot in which the building is about to be built is called the floor area
ratio (FAR).

FAR = Total built-up Area ( B + C ) / Plot Area ( A)

Here, the
sky blue color represents our total plot area.

__Key Point: Balcony area does not get
included in the total built up area. Only the area surrounded by walls is
considered in the total built-up area.__

For example
: If the plot area is 1000 sq ft, and if the FAR is 1.75, then the total
permissible floor area for the building is 1.75 * 1000 = 1750 sq ft. Total
permissible built up area is 1750 means, the integration of the total floor
area should be 1750. If we wish to build 2 story building of total permissible
built up area of 1750 sq ft then, if we have taken the floor area of ground
floor area as 1500 sq ft then the floor area of first floor should not exceed 250
sq ft (i.e. 1750- 1500 )

If we wish
to have 3 story building of permissible built-up area of 1750 sq ft, then the
foor area of the ground floor + floor area of firrst floor + floor area of
second floor <= 1750 sq ft.

For FAR=1

1000*1= 1000
sq ft

This means
we can build a building of area 1000 sq ft. Hence, we can either build a
building of one story having area of 1000 sq ft, or we can build a building of
2 story, each story having a area of 500 sq ft, or we can build a building of 4
story having area of each story as 250 sq ft, and so on..

__FAR is already fixed by government
for particular city or area.__

In
kathmandu, previously FAR was 1.75, but according to Building Bye Laws, KMC
published in 2018, allowable floor area ratio in kathmandu is 3.5.

__FAR as defined by Kathmandu Municipality
are:__

Building Type |
FAR |

Residential building |
3.5 |

School, College and University |
2.5 |

Star Hotels |
3.5 |

Government Buildings |
2.5 |

Government Hospitals and nursing home |
3.0 |

__Setback__

Setback is
the distance measured from the center of the road ( or from the edge of the
road) to the pinth beam of the building.

Importance
of setback distance:

1. It is important for the future
widening of the road.

2. It can be used for the parking of the
vehicles.

Also,
marginal ditance is the distance measured from the plot boundary to the plinth
beam of the building.

Marginal
distance are also called side setback or rear ( back) setback.

The certain setback distance is fixed by
government for certain city or areas.

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