A male may pair with one female for part of the season to raise a brood. He might then mate with a different female to raise the second or third brood of the breeding season. Males may also be mated to two females simultane- ously. House Wrens nest in natural cavities, tree stumps, woodpecker holes, building nooks and crannies, and in nest boxes. They have also been known to nest in such unique places as cow skulls, flower pots, tin cans, boots, scarecrows, and the pockets of hanging laundry.
Males begin building the nest by filling the nest cavity with small sticks.
Up to 500 sticks have been counted in a simple nest. High behind this pile, the female constructs a nest cup from various soft materials, like feathers, hair, wool, spider cocoons, strips of bark, rootlets, moss, and trash. Egg Laying Females lay one egg per day until the clutch is complete. The average clutch size is 6 to 8 eggs, but up to 12 eggs have been reported. The eggs are glossy white, sometimes tinted with pink or buff.