You should also make sure you have the latest version of the game, as the store restocks much more slowly in the earlier versions.
Buy the kits that DO show up, but don't worry too much about the repairs. The progress you make on the house is handed down from one generation to the next, along with collectibles and the family fortune. It's ok if the house still needs some work in the following generation/s.
Glad you're enjoying the game and welcome to the forums!