Step Brothers Filming Locations
Step Brothers was filmed in Los Angeles in the United States of America.
Trump National Golf Club Los Angeles as Catalina Wine Mixer
Not actually filmed on Catalina island, in fact, you can see the islands off in the distance in some of the shots.
1987 Midwick Dr as Dobak and Huff Home
The two adult children have to live together in this house when their parents get married.
Source: Seeing Stars