ما انفق مؤمن من نفقة الاّ اجر فيها الا نفقته فى هذا التراب رواه الترمذى

Rasulullah Salallahu Alaihi Wasallam is reported to have said, “Whatever a Mumin spends (upon himself), he will be rewarded for it except the money spent in sand (i.e. there is no reward for building a house when it is not required).

If a house is built in order to live in it, or to acquire an income then a person will be acquire Thawaab (reward)  for such an investment. However, it is not permissible to build a house merely to show one’s status and to boast. Constructing of a Madrasah, Masjid, is excellent and Mustahab.