Selecting an appropriate construction method is considered to be a persistent need to save cost, time and achieve high quality for construction projects. Especially as the selection depends on many complex manifold factors that affect project cost, time and quality. In addition to, the great calamities which happened latterly in the world such as covid-19 pandemic, inflation, resource depletion and prices rising which definitely affects construction industry. Wherefore it's momentous to measure the factors affecting construction method selection, to facilitate decision making in project's early study stages such as feasibility study stage or scheme stage to avoid its negative influences. Therefore, this research aims to explore and measure the factors affecting construction method selection for residential buildings in Egypt to facilitate decision making process, especially in current time that witness revolution in construction and difficult economic conditions. The exploring and measuring process will be based on three construction methods which are conventional construction, prefabricated on-site and prefabricated off-site. The results achieved by this research found that, there are eight main factors affecting construction method selection, three related to construction cost, three related to construction time and two related to construction quality. Moreover, the results showed that the factors related to construction cost and time were the extreme factors that affecting construction method selection.