The water that appears in the dream usually has a good meaning. But leaking rain doesn’t seem to have a good interpretation.
The dream of rain leaking into the house can be said to show one’s emotional anxiety. It’s a psychological dream that is being stressed by that. It may reflect the fact that he blames himself for not being able to do such things as the limitations of his ability and excessive work at work.
On the other hand, leaking rainwater could be a warning that could cause bad things to happen in the house.