UDS For Villas

Am owner of a villa in a property of about 145 villas and 32 apartments. Is UDS for villas in a property with mixed development (i.e. villas plus apartments) to be computed in the same way as a property with only apartments. The reason I ask is because builder has said that UDS for villa is same as plot area on which villa is built. This UDS is hence much lesser than the UDS which would include plot area + proportionate share of common amenities (such as club house etc). Is there any place where the rules to compute such UDS for mixed development is specified. What is the correct way for UDS of villas in such mixed development to be computed.