Pneumonia is the second leading cause of death after diarrhea in Indonesia, especially in children under five years old. Over the past few years the prevalence of pneumonia in children under five years old in East Java increased from 1,06% to 4,2% in 2013. The purpose of this study was to analyze the physical and environmental factors of houses and other factors such as children characteristic factors and socio economic factors. This research used secondary data from the National Demographic and Health Survey (IDHS) in 2012.

This research used cross-sectional design study, with 2.058 total sample of children aged 0-59 months. Data was analyzed using univariate and bivariate analysis using Chi Square method. This research could not prove an association between physical environmental factors of house and other factors with the prevalence of pneumonia in children under five years. Keywords : pneumonia, children under five years, physical environmental factors