I don't make birdhouses, because I'm not great at woodworking and I don't have the tools. So I buy them from a professional maker who has detailed descriptions of each house for each species and the specific needs of those species.
I already have tit birdhouse on another tree, so I wanted this one to be for different birds, so they don't fight for territory and also do other jobs in the garden. Tits are great at eating caterpillars, so I thought that flycatchers would be a useful addition. I think this one is empty, because it's too low, maybe this year I will have time to put it higher. I still see flycatchers in my garden, because the area is good for them, so I guess they're just nesting elsewhere.
Do you make, or buy houses for these birds? Are they inhabited?