What is a premium FSI?

Premium FSI is additional Floor Space Index beyond the base FSI that a developer can purchase by paying a fee (premium) to the local government or development authority, enabling construction of more floor area than what is ordinarily permissible on a plot.

How Premium FSI Works

  • A developer's plot has a base FSI of, say, 1.5
  • The applicable regulations allow purchase of additional FSI up to 0.5
  • Developer pays a government-determined premium (based on Ready Reckoner rate or land value)
  • After payment, the developer can build at an effective FSI of 2.0
  • The premium amount goes to the government or municipal fund

Premium FSI Calculation

Premium FSI Cost = Additional FSI Area Required × Ready Reckoner Rate × Premium Percentage

Example: Developer wants 500 sq mt extra FSI. RR rate = ₹1,00,000/sq mt. Premium = 60% → Cost = ₹3 crore.

Risks and Concerns

  • Overbuilding : excessive FSI without infrastructure upgrades stresses roads, water, and sewage
  • Affordability impact : premium costs are passed on to buyers, increasing flat prices
  • Regulatory complexity : multiple FSI layers (base, premium, TDR, incentive) create confusion
  • Misuse : developers sometimes build beyond sanctioned FSI, citing premium payment

Premium FSI is a powerful tool that simultaneously serves government revenue needs, developer commercial interests, and housing supply goals but only when calibrated against the city's actual infrastructure capacity.

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