One of the methods that could improve the safety performance of construction organizations is the safety climate approach, which is helpful to know the existing maturity level of the safety climate and to develop plans to achieve the required level of maturity. Most of the existing safety climate tools were developed considering different industries in developed countries while construction was based only on few tools. Construction projects in the Gulf Cooperation Council (GCC) member countries are at a peak. This article, therefore, attempts to develop a safety climate assessment tool for the Omani construction industry. A mixed research method consisting of systematic review (N = 32), structured questionnaire (N = 102), and email interview (N = 19) was adopted in this research. An assessment tool that has seven factors and 62 simple questions that the participants have to answer on a Likert scale of 1 to 5 is finally developed.