Since the 1960s, a turning point for civilization related to the increasing role of information and communication technologies (ICT) in creating the modern society can be observed. The sustainable information society (SIS) entails a new phase of information society development, in which the ICT adoption by the society stakeholders is the key enabler of sustainability. One of the most important issues in the debate about the SIS is the means to measure it. In this paper, a methodological framework for creating SIS evaluation indexes is presented. In practical terms, an exemplary adjustable index for evaluating SIS in households is created based on the presented approach. During the empirical research, the presented index is used to evaluate SIS in Polish households. The study showed the usefulness of the proposed approach and confirmed the fact that it can be used to build other SIS indices.