The house is a chick magnet every sparrow within coo-ee has taken to it's eaves, its corners and crevasses and stuffed every inch with nesting material and baby sparrows. Their nesting material is generally our insulation. It can't happen. It must stop and the books say they can be deterred if you remove their nests often enough. So Trev does. Usually it's only eggs, but this time, alas, it was wee chicks. Needless to say they didn't survive long out of the nest.
Building a house often inspires nesting instincts, how many times do we see young couples vowing and declaring not to reproduce while building, only to be found nailing up boards with a baby strapped to their back not long after. Just wish it wouldn't inspire the sparrows too.