Introduction: In 2019, according to the World Health Organization (WHO), pneumonia is the leading infectious cause of death in children under the age of five. In 2017, pneumonia killed 808,694 children under five, accounting for 15% of all fatalities among children under the age of five. Methods: An observational analytic survey with a case control design was used as the study approach. The research samples were collected using a simple random sampling procedure with 48 children under the age of five separated into two groups, 24 samples for the case group and 24 samples for the control group. The research was carried out between February and July of 2020. This study tools used were observation sheets and rollmeters.The data was analyzed using univariate and bivariate analysis using the Chi-Square test at a significance level of 0.05. Results: The results showed that there was a relationship between incidence of pneumonia in children under five with different variables, respectively, ventilation area, floor type, wall type, presence of smoke hole. Conclusion: It implies that the community should pay attention to the overall condition of the house, one of which is by improving home ventilation, adjusting the room area to the number of occupants, quitting smoking in the house, and cleaning the floor more often.