We've called pest control when this has happened to us in the past. We've had great luck working with Orkin FWIW. We recently had a bunch of paper wasps show up on our property and as soon as we can locate the nest we'll be making another phone call to them as well. Good luck!!
Call Jerry the Bee Guy! I had a similar problem and he came out and diagnosed it for me. (Turns out no action was required in our case.) PS his name isn’t really Jerry.
Pest control is certainly important to get the nest, but closing up the holes in your eaves is equally important. Highly recommend these sticky bee traps and putting them near the affected areas. Work magic for us.
Recently met Dan the Bee Man. He is in Ballard and has 10+ years of experience with "Poison-Free Stinging Insect Removal". Buy some honey from him, if you get a chance!
Seconding Liz's comment. If they are honey bees it's best to have Marvin (at Jerry the Bee Guy) remove them and give them a new home. Honey bees are great for our environment. If they are something nasty like paper wasps it's good to kill them before they hurt somebody.