We bought a rebuilt washing machine. After being without one for several weeks, it gave us a very happy feeling. Do we make a Shehecheyanu upon paying for it after installation or after the end of the first wash?
(similar question) A neighbor totally fixed his house and added another floor, when does he make Shechecheyanu?
Do you make the brocho, just for painting?

A. On question 103 on buying a used car during the 3 weeks, we wrote; “Horav Shlomo Miller’s Shlit”a opinion is that since this car will presumably be used by other members of the family too, the correct brocho to be recited would be Hatov Vehameitiv, (as more than the buyer will benefit from it) and not Shechecheyanu, (see Igrois Moishe O.C. 3, 80), and therefore it could be purchased if needed immediately.”
Therefore, on both cases above, the correct brocho would be Hatov Vehameitiv, since presumably the benefits are enjoyed by more than one person.
The Rov also maintains that whenever there is a doubt on the above brocho, one can have in mind thanking Hashem for the great gifts received, when reciting the brocho Hatov Vehameitiv during Bitrchas Hamazon.
The Rov’s opinion is that when you do recite Shechecheyanu, you do so when you take possession of the article and begin using it. The Rov’s opinion is also not recite a brocho for repainting a home.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a