Second Council of Nicaea, Canon XVII

That he shall not be allowed to begin the building of an oratory, who has not the means wherewith to finish it.

Certain monks having left their monasteries because they desired to rule, and, unwilling to obey, are undertaking to build oratories, but have not the means to finish them.  Now whoever shall undertake to do anything of this sort, let him be forbidden by the bishop of the place.  But if he have the means wherewith to finish, let what he has designed be carried on to completion.  The same rule is to be observed with regard to laymen and clerics.

Translation: Henry R. Percival, The Seven Ecumenical Councils, NPNF II.14 (1900), via CCEL.