The more society gets complicated and developed, the more demand for various products. As a result, we are living in a flood of various products. However, considering how people consume and use products in their daily life, it is not difficult to find people transforming, changing the original purpose or adding value to existing products instead of buying new ones. This phenomenon has been defined as everyday design. In a sense that everyday design provides a better understanding of actual uses in real context, it deserves to be studied. Therefore, this paper attempts to figure out an underlying mechanism of everyday design. For this, a conceptual framework was developed, whose focus was on what triggers everyday design, what goals are set, and how a product is transformed. The conceptual framework was validated with a photographic inventory of users’ everyday design in our daily life. The conceptual framework could provide a better understanding of everyday design in a systematic way. If it is considered in the product development process, it could contribute to an increase of use satisfaction as well as sustainable design. The limitations and a further study are discussed at the end of the paper.