Just because "ICE does it all the time," that doesn't necessarily mean their actions were legal.  If the owners were living in the lower floor of the residence like the cameraman in the video was saying, then entry by law enforcement is absolutely prohibited without a warrant or an invitation by the owners.  If the contractors have no authority to trespass anyone, they also have no authority to invite agents into a private residence.  Therefore, the ICE agents were still trespassing. Period.