Carpenter bees bore holes into wood overhangs, fence posts, and trees. They will crawl between cracks of siding and roofing. This hole will go straight an inch or two and then turn 90 degrees. This new portion of the nest becomes an egg chamber. Eggs are laid at the end of these chambers.
Food is placed alongside the egg and then sealed tight.
It is common for an egg chamber to be two or more feet long. It may have numerous egg chambers branching out from the main chamber. The female carpenter bee will stand guard at the nest entry hole. She will defend the nest aggressively. Once the drilling has been completed, she will spend her days foraging for food.