I would guess they would almost surely have multiple entrances, and exits. The typical nests I've seen in the area are in the ground and not large. But who knows how big it could get? My concern is if you don't find all the exits, you'll never get rid of them. And I don't thing man and Vespula can coexist in a house. Is there a lot of activity coming and going during the day? Dead or near dead inside the house might indicate it is lost and isolated from a water source. How long has the nest been there? I used to swat flies on my deck during warm whether, and when the stunned flies hit the deck V. pennsylvanica would swoop in out of nowhere, and carry them off. So, I'm wondering if the house has termites, would they feed on them?

In Novato, north of here at the old Black Point Forest Rennaisance Farie site, the ground nesters ALWAYS had 2 entrances, I've never found 2 entrances here, so maybe that was a different species.

The ones being found in the house, were dead or near dead, the nest got exterminated by the Bee Keeper who lives there, as he was leaving for 3 months and his son was going to be there, he wasn't going to leave pests for him to deal with. Otherwise, they'd still be around, I took other pictures of wasps hanging over his doors and they coexisted well.

It was unknown how, long the nest had been there but it took 2 treatments, ensuring a nozzle was inserted in their hole before the can of spray was fired.

Food is food, termites I assume are food, unless the formaldehyde they may have, is upsetting to the wasps.

...I don't remember exactly how it works but they transition between sugar and protein. Well I'm glad the coexisted well until he wiped them out. I wonder if they would attack a bee hive?

Yes, Bee keepers are always on the look out for Raiding Yellow Jackets. They have things they use to reduce entrance size so 'the girls' can defend the homeland from Darth Zacket.

If the yellow jacket nest is close, some bee keepers will exterminate it, but some will do all they can to coexist, the small home bee keepers in our area are incredible in understanding a lot of the interfaces of nature with them and 'their girls'. They are more responsible and educational prone them all of the weekend warrior environmentalists I run into.

I'm on the local Bee list, this was about the 4th or 5th, come out and ID my pest, let me know should I worry' I've done in the last 3 years. The folk with one under the hot tub used my paving tile/skunk removal method. But that one and this one are the only ones exterminated, the education about the Zackets let them learn to live with them.

As the season progresses they shift towards a sugar diet. It's at least possible if the right plants are available, they won't be as prone to raid a bee hive. I've read that if just one yellow jacket enters a bee hive, she will be ignored, and can make off with a little honey. It's only when they invade in numbers that they arouse a response.

We get super nests in this area, sometimes under trees, one was out in the open and was still going In January after 4 frosts, the low rainfall apparently made it possible for them to survive.

This nest is between floors, I suspect it would survive.

If Bee Keeper took the siding off, what would you do with the nest inside? Hopefully the bee keeper in question is subscribed to this thread! It's his house.