Does the reward for building a mosque reach the deceased?

The questioner : Regarding, Shaykh, you mentioned the hadith . If a mosque is built for a deceased person by his children, does the reward for building this mosque reach him?

The Shaykh : Yes, he will ask for it, if Allah wills. This is because it is established from the Prophet (peace and blessings be upon him) that he permitted Sa'd ibn Ubadah to make his garden a charity for his mother after her death. A man came to him and said, "O Messenger of Allah, my mother died suddenly, and I think that if she had been able to speak, she would have given charity. Should I give charity on her behalf?"
He said, "Yes." However, the Prophet (peace and blessings be upon him and his family) guided us to something we do for the deceased—indeed, we do for the deceased—that is better than this, which is supplication. He said (peace and blessings be upon him and his family): . So, the Prophet (peace and blessings be upon him and his family) mentioned supplication and did not mention charity, prayer, fasting, Hajj, or 'Umrah on behalf of the deceased. The Prophet's (peace and blessings be upon him and his family) deviation from mentioning these deeds, while the context of the hadith is about deeds, indicates that supplication is better than deeds. This is because it is impossible for the Prophet (peace and blessings be upon him and his family), the sincere and trustworthy one to his Ummah, to guide them to something when there is something better than it. So, my advice to my brothers who want to benefit their deceased is to increase their supplication for them and to make their righteous deeds for themselves, for they do not dispense with righteous deeds, and the day will come when they will be like the deceased today.

The presenter : May Allah reward you,