Oh, I hate those things! There is always one or two buzzing around the front porch. You gotta crawl under the porch and get in some next to impossible positions to find their holes. I did manage to get one that was flying with the "flip flops of death" but usually they are too fast for me.
Tell us about your trap, Jo. What do you bait them with?
Carpenter Bees all wood house major issue. Tried self spray, exterminator spray(Mega Bucks), all
approx 30 day control. Wife nix respray for have to re clean windows (contract 2-3 story). Best option appears
to be the traps, I catch and dump 1/2 pint jar 2-3 times per season. Theses similar to described by Jogeephus.
Not as bad as described by my BIL this weekend. Mid 80's he had all wood house down road from Lindbergh house in New Jersey , said worse was woodpeckers after bee eggs and larvae, said they tear up 12-16 inch fascia board and no option but replace. Rough cedar cooking deck, sprayed last month, have more in trap than dead from insecticide contact., so I question the $300 I paid to treat that.
Here is the link that will take you to the picture of my setup. Easy enough to make. The key to make it work really well is to kill a bee, preferably a female, and put it in the bottle. The pheromones will attract others and once they go in they aren't coming out. I have about 30 in one trap and don't have many bees anymore.
These traps work., work better if You invest in western cedar. People complain only catch 3-4/season. My input You don't have a problem. Have all wood house, 3 traps, and dump 1/2 pint jar 2-3 times per season.