In order to embed blended learning environments in a strategic and sustainable manner, a multi-actor, multidimensional approach is necessary. This paper reports the results of a 3-round Delphi study involving 28 experts which focuses on the refinement and validation of a layered maturity model that assesses key aspects of blended practices in higher education. The study examines the wording of the proposed assumptions, dimensions and indicators, whether they bear validity and if there are others that are not accounted for. We present the findings of each round, the confirmed maturity model and a series of recommendations for its future usage. As such, it is helpful for lecturers, program coordinators, support services or institutional leaders to decide upon follow-up actions and to achieve up-scaled blended programs and courses in higher education institutions.