Understanding FSI/FAR Before You Buy a Plot
By Sambhav K. Pandey
Plot size is often treated as the headline number in a land purchase, but it tells you very little on its own about how much you're actually allowed to construct.
What FSI/FAR Actually Measures
Floor Space Index (FSI), also called Floor Area Ratio (FAR) in some contexts, is the ratio between the total built-up area you're permitted to construct and the size of the plot itself. A higher FSI means more construction potential relative to the same plot size.
Why It's Set by the Authority, Not the Seller
FSI is determined by the local development authority based on zoning, infrastructure capacity, and area-specific planning — not by the seller or the current use of the land. It can also change over time as local development plans are revised.
How Two Similar-Sized Plots Can Allow Very Different Construction
Two plots of identical size in different zones, or under different authority jurisdictions, can carry meaningfully different FSI values — meaning one might allow significantly more built-up area than the other, directly affecting its investment value.
How to Find Out the FSI for a Specific Plot
The applicable FSI for a specific plot can be confirmed through the relevant development authority or municipal body. This is worth checking before finalizing a price, especially for investment or construction purposes.
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