It is not prescribed to say the iqaamah except in the case of the five obligatory prayers only
Question

                Is it obligatory to recite the iqaamah for the naafil prayers?.
Praise be to Allah.It is not prescribed to say 
    the iqaamah except in the case of the five obligatory prayers only. There is 
    no iqaamah for Eid prayers, prayers for rain (istisqa’), eclipse prayers 
    (salaat al-kusoof) or naafil prayers. 
In Fataawa al-Lajnah 
    al-Daa’imah (7/234) it says: It is not prescribed to say the iqaamah 
    before naafil prayers, rather iqaamah is only prescribed for the five 
    obligatory prayers. End quote. 
It also says (7/231): It is 
    not prescribed to recite the iqaamah for the naafil prayers at all, because 
    that is not mentioned in sharee’ah. End quote. 
And Allaah knows best.