The 29-year-old disc jockey reportedly asked the British singer to move into his Beverly Hills home to prevent their busy schedules from keeping them apart.
"Over Christmas, Calvin asked Rita to move into his Los Angeles home full-time so their work commitments don't lead to a break-up. He believes they can make their relationship last if they both fully commit to it," a source told the Daily Star.
The insider added that in the beginning of their relationship the couple struggled significantly with spending "weeks at a time away from each other."
And while Ora was looking for a new home since being forced to leave her apartment in London over complaints of loud late night parties, the singer still took some time to ponder whether moving in with Harris was the right decision.
"Rita took her time making the decision. It's a big step after all. But she does spend a lot of time in LA anyway and has friends there," the source explained. "So in the end she knew it was the right thing to do. Calvin was delighted when Rita told him the answer was yes."
Harris and Ora have been dating since May 2013.