One thing that is a problem in my house is the fact that each year I get the large bees in the wooden fence that is around my property. We just bought the home about a year ago and this year my plan is to treat the areas before they start to become a bother. I always hated the way they would fly at you randomly and almost dive bomb you as you are walking by or just trying to enjoy the sun on a lounge chair.
These are known as carpenter bees, and they don't just infest fences. They often times will nest in wooden siding, sheds, the fascia board or wooden window and door frames around the house. They seem to love, well, wood. The carpenter bees are not eating the wood, they are excavating out a nest to care for their young. The holes are perfect circles and many times have frass or wood dust dripping from their holes. Left untreated, they can eventually cause some damage.
Treating carpenter bees can range anywhere from dusting a few holes with some insecticide to calling out the pros and power spraying entire areas of a house. Sometimes there are just too many holes to treat and too many that are hidden to treat independently. The best time to treat is either before they begin their active season in spring or waiting until near dark and spraying the holes carefully. The male bee can not sting and the female needs to be badly provoked, but she can give you a wallop.
Once the holes are sprayed then wait again until mid summer, if more are noticed repeat the spraying and then after another few weeks seal the holes with some wood putty.
It has been noted that covering wooden surfaces with a thick paint may help, but I have seen these bees go through that as well.