Floor Area Ratios (FAR) calculation in Bangladesh

Suppose you have 5 kathas of land and you are planning to build an 8-10 story building. Financially, you have no issues. However, according to RAJUK’s regulations, you cannot build a 10-story building on 5 kathas of land due to the required setback, which is the space you must leave around the building.

How to Calculate FAR?

Assumptions:

  • Land: 5 kathas
  • Road: 20 feet
  • FAR: 3.5

Calculations:

  1. Maximum Build Area (M.B.A):
  • Formula: MBA = Land x FAR
  • Calculation:
    • 5 kathas x 3.5 (FAR)
    • 5 x 720 x 3.5 (1 katha = 720 square feet)
    • 3600 x 3.5
    • Total: 12600 sqft
  1. Maximum Ground Coverage (M.G.C):
  • Formula: MGC = Land x Coverage Percentage
  • Calculation:
    • 5 kathas x 62.5%
    • (5 x 720) x 62.5%
    • Total: 2250 sqft
  1. Number of Floors (N.O.F):
  • Formula: NOF = MBA / MGC
  • Calculation:
    • 12600 / 2250
    • Total: 5.6 floors
  1. Total Floors:
  • Formula: Total Floors = Ground floor + NOF
  • Calculation:
    • 1 + 5.6 floors
    • Total: 6.6 floors (6 stories and a penthouse)

According to this calculation, you can build almost seven stories. However, to ensure safety from earthquakes and to maintain the aesthetic balance of the area, it is advisable to limit the construction to six stories and a penthouse.

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© Mukto Samadder