In general, the choice to start the development of a new standard is up to the stakeholders.
The development of the set of EPB standards was originally initiated by the European Commission under mandate M/480, to support the energy performance of buildings directive, EPBD (link to EPBD).

Europe started to develop EPB-related CEN (=European) standards many years ago (read more). So it made sense to take these as the starting point.
However, in the area of thermal and solar properties of building components (including windows), energy needs for heating and cooling and climatic data a long years cooperation existed already between CEN and ISO, so these EPB standards were developed as EN ISO standards from the beginning. For instance: EN ISO 52016-1, as successor of the well-known EN ISO 13790:2008 on the calculation of heating and cooling needs.

Because each EPB standard leans strongly on the overarching EPB standard (EN ISO 52000-1), that standard has also been adopted at ISO level.

Some of the EPB standards dealing with heating and cooling systems and with building automation and control are currently being prepared to become global (EN ISO) standards. And in a few years the rest might follow.

Read more:

2019.07.22