Section 81(2)(a) in Kerala Municipality Building Rules, 1999
(a)Floor area based on FAR permissible as per column 4 of table 2 in rule 31 for the extent of the plot prior to surrendering of the land plus an incentive floor area of twice the FAR permissible as per column 4 of the table 2 in rule 31 for the extent of land surrendered free of cost.