*Peasblossom is right, wasps won’t rebuild in the same nest next summer, and the one you can see will be from last summer, and empty now. The time to watch out for new nests being formed is late May and early June, if you see one in the very early stages you can get rid of it yourself - I had a new one in my shed, so I knocked it out with a stick, and blocked up the gap the wasps were using. If it’s bigger, you need to get in pest control - most councils can no longer afford to provide the service unfortunately, so you have to pay.