What is FSI/FAR and how is it regulated?

FSI (Floor Space Index) or FAR (Floor Area Ratio) is a critical urban planning metric that defines the maximum permissible built-up area on a plot, expressed as a ratio of the total floor area of a building to the area of the plot on which it stands.

FSI / FAR Formula

FSI = Total Built-up Floor Area of Building ÷ Area of the Plot

Example: A 1,000 sq mt plot with FSI of 2.5 allows a maximum of 2,500 sq mt of built-up floor area.

How FSI Is Regulated in India

  • Development Control Regulations (DCR) : the primary legal instrument governing FSI
  • Master Plans and Development Plans : define FSI zones across the city
  • State Town Planning Acts : provide legislative authority for FSI rules
  • RERA : ensures FSI used in a project matches the approved plan

FSI is the single most powerful number in urban real estate it determines how much can be built, what the land is worth, and how dense a neighbourhood will become. Understanding FSI regulations is non-negotiable for any developer, investor, or planner operating in Indian cities.

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