Notwithstanding anything contained in the D.C.Regulations 32, 33 & 34, the
Commissioner may, by special permission, permit fungible compensatory Floor
Space Index, not exceeding 35% for residential development and 20% for
Industrial/Commercial development, over and above admissible Floor Space Index,
by charging a premium at the rate of 60%, 80% and 100% of the Stamp Duty Ready
Recknor Rate, for Residential, Industrial and Commercial development
respectively./
Provided further that such fungible compensatory FSI for rehabilitation
component shall not be used for free sale component and shall be used to give
additional area over and above eligible area to the existing tenants / occupants.
Did the builder refuse the same in writing after you have applied for the same in writing to the builder.
If he is refusing it orally then you issue a legal notice to him by registered post demanding the same quoting the above provisions of law, let him give a reply either accepting it or denying it, you can drag him to consumer court or appropriate civil court seeking relief and remedy.