1. The comedian at the dinner show is wonderful. He brings down the house every night
2. The music critic didn’t like the new symphony being presented at the concert hall. In his newspaper review, he said it would never bring down the house.

The expression is almost exclusively used to describe theatrical or musical performances, but it could also be used for any event that would generate applause. It suggests that when an artistic performance is a great success, the audience applauds so noisily as to make the ceiling and walls of the theater collapse.