Dear Querist,
In such a situation, no exemption from Service Tax is available.This single residential unit will be part of residential complex defined in clause (zc) of Para No.2 of Notification No.25/12-ST dated 20.6.12 as amended. The definition is extracted below:-
Para No.2 : Definitions
(zc) “residential complex” means any complex comprising of a building or buildings, having more than one single residential unit;
Earlier definition of "Residential Complex" having common area, common road and common stair etc. has been omitted.
How can any residential house be constructed without approval from the Competent Authority ?
The department may treat such plan as 'manipulation' and show cause notice will be ready. If any one of the conditions is missing, even then SCN attracting demand, interest and penalty will be issued.
Do not be swayed away by any lacunae in law, if any.