Understanding Floor Space Index: Key Role and Easy Calculation Guide

Floor Space Index (FSI) or Floor Area Ratio (FAR) is a central idea in real estate and urban planning. It measures the amount of construction allowed on an area of land. Simply put, FSI is the relationship between the total built-up area of a building and the overall plot area. To illustrate, if the size of the plot is 1,000 sq. ft. and the FSI permitted is 2.0, the developer can build a maximum of 2,000 sq. ft. of floor area.

The significance of FSI is to keep urban development balanced. It prevents overcrowding, allows for sufficient light and ventilation, and checks the load of infrastructure like roads, sewerage, and utilities. Fixing FSI limits, the authorities control the population density and maintain environmental sustainability in cities.

The calculation is simple:

FSI = (Built-up Area Total) ÷ (Plot Area)

Knowledge of FSI serves homeowners, builders, and investors in projecting projects efficiently while remaining within the confines of local development regulations. High FSI indicates greater construction possibility, whereas low FSI enhances green spaces. FSI, therefore, plays an important function in determining urban skylines and developing livable environments.