The lapses occured in the 'Housing Scheme 2014' under which the Authority had offered over 25,000 across various categories.
"DDA has informed that seven such instances (where single flat alloted to two or more persons) have come to their notice in the allotments under Housing Scheme-2014," Minister of State for Urban Development Babul Supriyo said in written reply in Lok Sabha.
He said DDA has also informed that "erring officials" for such mistakes are being identified for "fixing responsibility".
However, as on November last year, nearly one-third allottees had surrendered their flats as they did not like the location of flats or they did not find the built-up area sufficient, among other reasons.