Chickadees will lay around 3-10 eggs. Our two nesting pairs have laid 6 and 5 eggs. Both nests are the in stage of "sitting on the nest"also known as the incubation period. The eggs should hatch in 11-14 days. As you can see the nest looks fluffy and comfortable. They build their nest with twigs and moss, then line the nest with fur. I think there are a few of my dog Ella's hairs in their as well!
To learn more about chickadees see this site: all about birds
To learn more about nest boxes see this site: birdhouse network