No offence ment. I was just too lazy listing the UK ones like
https://www.ryanbuildswheels.co.uk/
https://thecycleclinic.co.uk/
and a couple of others.
But since you mentioned EU and not Europe, they aren´t really relevant.
I´m not familiar with any in EU. A lot of LBS´ build wheels though. If you tell them what hubs, rims and spokes you like, they can sort you out. If you´re not sure what hubs, rims and spokes fit your needs, the wheelbuilder topic is a good place to post your question