Each fall the birdhouses need some work. The biggest thing is to clean out the old nest. I added a fresh layer of roofing material to this one as well, and added a giant washer to the front of the hole to prevent the squirrels from expanding the hole and moving in (yes this happens). Finally I added a fresh coat of paint.
This is our oldest birdhouse. I think this one was already up at our old place when we bought it. I never saw a bird in it there, but here most of our birdhouses get occupants, mostly house sparrows.