The Griswold house is actually an exterior set on “Blondie Street” on a Warner Brothers back lot in Burbank, CA, as is Todd and Margo’s house (the neighbors next door). The house has been altered a lot to serve other movies, especially the interiors, which are also only a set, not a real house. You can take a virtual tour of Blondie Street here. The Griswold’s house is on the far left just as the virtual tour begins
According to the Warner Bros. website, Blondie Street was built to look like a suburban neighborhood. It has also been home to many movies and TV series, including American Beauty, Pleasantville, Gidget, Bewitched, The Partridge Family, and Eight is Enough. There are 12 residential homes on the street in a variety of styles (some with practical interiors).
The interiors were filmed at Warner Bros. Studios in Burbank, California.
Below are some images of the “Griswold” home as it appeared during the film.
Below is the “Griswold” home as it appeared in the movie Lethal Weapon
Below is the “Griswold” House as is appears today.