The fundamental formula that decides how much you can build on your plot
Expressed as a ratio or decimal (e.g., FSI 1.5, 2.0, or 2.7).
Often expressed as a percentage or ratio (e.g., FAR 150 = FSI 1.5).
Set by municipal corporations based on plot size, road width, and city zoning.
Swipe right to calculate permissible built-up area on your plot
How municipal corporations calculate your maximum permissible floor area
If your plot is 2,000 sq ft and permissible FSI is 1.5:
2,000 sq ft × 1.5 = 3,000 sq ft total construction across all floors.
You can build 3 floors of 1,000 sq ft, or 2 floors of 1,500 sq ft (subject to setbacks).
FSI governs total building volume, while setbacks govern plot ground coverage
Why wider front roads unlock higher construction potential in Indian cities
Restricted density to prevent traffic choking and fire engine access issues.
Standard residential road width allowing G+3 to G+4 apartment construction.
Unlocks transit-oriented development, premium high-rises, and commercial hubs.
Always obtain an official property card or DP zoning remark before purchasing land
How builders and homeowners legally purchase extra construction rights
The default construction index granted free of cost with your plot registration.
Additional FSI purchased directly from the municipal authority at Ready Reckoner rates.
Certificates generated from road widening or slum rehab transferred to developable plots.
Purchasable FSI depends strictly on road width and local development control regulations
Valuable areas that do not count against your permissible building limit
Dedicated car parking floors are exempt to encourage off-street parking.
Vertical circulation cores and lift machine rooms are often excluded or paid premium.
Cantilever balconies up to 10% to 15% of floor area frequently enjoy FSI concessions.
Verify local municipal rules (BMC, BBMP, DDA, PMRDA) as exemption lists vary by state
Why having FSI 2.0 does not mean you can cover 100% of your plot ground
Percentage of plot ground that can be physically covered by the building footprint.
Required open space between road boundary and front building wall.
Essential buffer for natural ventilation, window setbacks, and fire safety access.
Your building must fit inside the setback envelope regardless of total FSI entitlement
Major policy differences between Mumbai, Delhi, Bangalore, and Hyderabad
Base FSI 1.0 to 1.33 with extensive purchasable TDR and fungible FSI options.
No fixed FSI cap on wide roads; construction limited solely by setbacks and height.
Strict FAR ranging from 150 to 325 tied to master plan road hierarchy.
Always hire an architect licensed with your specific local development authority
Free interactive FSI calculator customized for Indian property owners
Input plot dimensions and local FSI to calculate exact permissible square footage.
Understand realistic usable carpet area after deducting walls and common cores.
Immediately transfer your permissible square footage into our 2D CAD studio.
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