Can fidyah for missed salah/fasts be given in causes e.g. building a well?
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْم
In the name of Allah, the Most Gracious, the Most Merciful
The recipients of Fidyah are the same as the recipients of Zakah. Hence, all the conditions related to the discharging of Zakah to Zakah recipients also apply to the recipients of Fidyah, for e.g. the Fidyah amount has to be given to poor and needy Muslims and not non-Muslims.
Keeping all the above in mind, fidyah cannot be given for building a well or for other causes such as building a mosque etc.
Only Allah knows best
Written by Maulana Belaal Ahmed
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
 Fataawa Mahmoodiya vol 10 pg 178