Cees, Jacquelien, Jillis, Lucas, and Thijske Noordhoek gather on the lawn; Andy Dochter looks out of the window while his wife Miriam stands on the terrace with sons Thomas and Vincent.

Craving not just a home but a proper piece of architecture, a handful of design- and business-savvy Dutch families banded together, hired an architect, and set about forming the community that would…