bees building hive in house foundation blocks

Asked July 24, 2020, 3:34 PM EDT

I don't want to kill the bees, but I don't want them living in my foundation blocks. Is there a way I can force them to leave? I put some cinnamon sticks in the opening and that hasn't driven them away.

Ramsey County Minnesota

3 Responses

Most likely what they are are carpenter bees. The female will make the nest in the spring and the new adults will emerge late summer. I would wait until the adults emerge and then repair and paint the window frame. This will deter them from wanting to use the nest again. Here is a good article that includes information about their life cycle and prevention: https://extension.umd.edu/hgic/topics/carpenter-bees

Hello Catherine,

My bees don't match the description of the carpenter bees. They are smaller, slimmer and lighter-colored.

Does the mitigation strategy change if they are honey bees or some other kind of bee?

I doubt they are honeybees - when people get a hive in their homes, it's usually in a wall cavity or eaves. Carpenter bees are the usual suspects for living in spots like this, but not the only type of bee that nests this way, so I think that that the same strategy should work.