I has wasps flying around the back door and window, they were going in/out of a vent in the soffit board along the back of the house last summer. We have metal mesh vent covers that were loose so I assumed they’d got in and were building a nest.
I got some powder that you spray on the opening etc. and they carry it in to the nest. Only needed one application and no more wasps since 🙂
Zero In Wasp Nest Killer Powder – 300 g £5.99
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!