Sat in the garden, and look up towards our eves, and can see a steady stream of wasps - it's going into the neighbour's bathroom extractor fan outlet....
It's happened once before she moved in TBH. I'm not going round tonight and ruin her evening worrying, so will catch her when her partner pops round this weekend. She has a primary age child. She's like us, she doesn't use the extractor, and just opens the window next to it.
Normally you'd leave it, but it's right in the bathroom cavity with easy access to the house (assuming entrance is on the outside wall) so treatment probably needs an expert, and not my usual approach.
I leave them, unless they are a potential issue like this. My approach is a few glasses of wine, wait till dark, out with 'wasp nest destroying foam', spray, run fast (slightly tricky when you may be up ladders).