Introduction: This is a mixed design study planned to determine the views of women, midwives, and physicians about the ideal birth unit and to develop a to develop a valid and reliable measurement tool for postpartum women's evaluation of the effect of birth units in terms of physical, emotional, and social aspects on their satisfaction with the birth environment. Methods: The exploratory sequential design, which is accepted as a mixed design, was used in the study. In the qualitative phase of the study, a content analysis was conducted by interviewing a total of 20 participants including 5 pregnant women, 5 postpartum women, 5 midwives and 5 obstetricians. In the quantitative phase, the Draft Birth Unit Satisfaction Assessment scale, which was developed in line with the data obtained as a result of the qualitative study, a literature review, and expert opinions, was used to evaluate postpartum women's (n = 435) satisfaction with the birth environment. Content validity, exploratory factor analysis, and confirmatory factor analysis were used for the validity analyses of the scale, and item analysis, internal consistency, and time-dependent invariance were evaluated for reliability. Results: In the qualitative phase of the study, the themes were grouped under 5 categories (physical features of the hospital, features of the birth room, privacy, aesthetics and support) according to the qualitative data on the factors that showed participants' views on the ideal birth unit. In the quantitative stage, the Birth Unit Satisfaction Assessment Scale, which consisted of 30 items and 5 sub-dimensions (communication and care, physical characteristics of the birth room, comfort, opportunities supporting birth, and decoration and aesthetics), was developed. Discussion: In conclusion, it was determined that the scale developed in this study was a valid and reliable measurement tool that could be used to evaluate postpartum women's satisfaction with the birth environment.