I heard Allah's Messenger (ﷺ) as saying: He who builds a mosque for Allah, Allah would build for him (a house) in Paradise like it.
Sahih Muslim Book 55, Hadith 54
← Previous Hadith You discuss it very much whereas I have heard Allah's Messenger (ﷺ) as saying: He who builds a mosque-- and the narrator Bukair said: I think he also said: (for) seeking the pleasure of Allah- Allah would build (a similar house for him in Paradise). and in the narration of Harun (the words are):" A house for him in Paradise."

Sahih Muslim Book 55, Hadith 53 Next Hadith → " Allah would build for him a house in Paradise."

Sahih Muslim Book 55, Hadith 55