Make visitation a vital part of the functional part of your ministry to youth and ensure that you are not the only one doing all the visiting. Student leaders can be used greatly by God in ministry into the homes of young people. Visiting skills can be taught to a small group who will probably enjoy the activity after some exposure. I've come to visit. It is usually best to determine when would be an appropriate time to visit, so that you do not clash with a meal or study time.
People appreciate being notified in advance that someone is coming to visit.
State the reason why you wish to visit and ask if it would be convenient. This gives them a chance to decline or suggest an alternative time. If a young person expressed a hesitation about you coming to visit, it may be because of a home situation that they wish to keep hidden, or something that they are embarrassed about. If this occurs then suggest meeting them at a neutral place, like a shopping centre, a fast food outlet or a park, in fact any place that will provide a setting where you can talk is ideal. Jesus established a pattern when he sent his disciples out in two's to reach people.