There is no New Testament example of anointing someone's home. But based on principles in the Old Testament, the first thing to do is seek God and look around for any evidence of idolatry in the home. They have to get rid of idols if they want God's blessing. Ask questions.

The second thing is whatever you do, first be full of the Holy Spirit. What you do is an act of consecrating the house to God. Its a meaningless thing if the people there don't want to surrender themselves to Jesus Christ fully.