How to calculate FSI for redevelopment?

How to calculate FSI for redevelopment?

Calculating the Floor Space Index (FSI) for a redevelopment project involves a slightly different approach than calculating FSI for a new construction project. Here are the steps to calculate FSI for a redevelopment project:

1. Determine the existing built-up area of the property: The existing built-up area of the property is the total area covered by all existing structures on the property. This includes all buildings, structures, and other covered areas.
2. Determine the total plot area: The total plot area is the entire area of the property, including any open spaces, setbacks, or other areas not covered by buildings.
3. Determine the permissible FSI for the property: The permissible FSI for a redevelopment project is usually determined by local building regulations and zoning laws. This may be different from the FSI allowed for new constructions.
4. Calculate the additional FSI that can be utilized for redevelopment: To calculate the additional FSI that can be utilized for redevelopment, subtract the existing built-up area from the permissible FSI.
5. Calculate the total FSI for the redevelopment project: The total FSI for the redevelopment project is the sum of the existing built-up area and the additional FSI that can be utilized for redevelopment.

Here is an example to illustrate the calculation of FSI for a redevelopment project:

Suppose you have a property with an existing built-up area of 5000 square feet and a total plot area of 10,000 square feet. The local building regulations allow a permissible FSI of 2.5 for the property.

1. Existing built-up area = 5000 sq ft
2. Total plot area = 10,000 sq ft
3. Permissible FSI = 2.5

Additional FSI that can be utilized for redevelopment = Permissible FSI – Existing FSI = 2.5 – 1 = 1.5

4. Additional FSI that can be utilized for redevelopment = 1.5

Total FSI for the redevelopment project = Existing FSI + Additional FSI = 1 + 1.5 = 2.5

So, the total FSI for the redevelopment project is 2.5, which means that a maximum of 12,500 square feet of built-up area can be constructed on the property.