A HUPG member can be a town or part of a town that has a distinctive historical core, unique architectural heritage, quality and consistently maintained characteristics. The membership application must be submitted in writing, stating the name and function of the person that will represent its city or protected area at the HUPG meetings.

HUPG organizes conferences, workshops and cultural events; it participates in European projects, works with universities, working groups and participates in the preparation of joint publications.