1) the rules laid down by the CMDA divide buildings into three types, ordinary buildings, special buildings and multi-storeyed buildings.
2) This classification is based on the height of the buildings, number of households in a plot and extent of commercial activity.
3)The ‘ordinary’ buildings are the buildings that do not exceed a height of 9 m (30’) in height. These are generally low ground plus one-storeyed building.
4) The ‘special buildings’ cannot exceed a height of 15 m (50’). These are generally residential or commercial buildings with more than two floors but not more than 4 floors. The ‘special buildings’ are, as the name suggests, a special type of multi-storeyed buildings.
5) These consist of residential buildings with more than four dwelling units and commercial buildings exceeding 300 meter square (3228 sq. ft.) of plinth area. When it comes to these buildings, the height of 15 m matters more than the use to which they are put, be it residential or commercial.
6) the FSI for ordinary and special buildings (residential and commercial) is 1.5. This means that the plinth area should not exceed 1.5 times the area of the plot where construction is being projected.
7) there are a few exemptions to the this calculation like parking area, electrical transformer room, garbage area, caretaker's room, etc provided the plinth area of such service areas does not exceed 10% of the total plinth area.
8) FSI can be availed on all plots that abut on a road that has a minimum width of 30 feet. The premium FSI for plots that meet roads that have a width of 30 feet or more and lesser than 40 feet is 20% of the normal FSI. The buildings on plots that abut roads that have a width more than 40 feet and lesser than 60 feet, have a premium FSI of 30%
9) consult a local architect