Is it still a spin-off…

…if it airs on another network?

House has cast Michael Weston to play “P.I. Lucas,” a private investigator who is just as intelligent but not quite as abrasive as the infamous Dr. House. The plan is to have him appear in multiple episodes of Season 5. The character could join the show for good, or become the focus of a spin-off series.

NBC Universal produces House for Fox Broadcasting Company. Would they put the new show on NBC instead of on FOX?