The phenomenon of a gas explosion, due to its complexity and the scale of possible consequences, is the subject of numerous studies. Gas explosions in a confined space can have various consequences both for those in the room and for the structure itself. The main problems of ensuring fire and explosion safety of gasified residential buildings are considered. The analysis of the accidents with gas explosions both in Russia and abroad, the search for possible causes of the development of an emergency with the formation of dangerous concentrations of natural gas in the premises of apartments. Explanations are given about the degree of influence on the threat of an explosion of typical plastic windows. Possible preventive measures and ways to reduce the risk of a gas explosion in a residential building are proposed, including the possibility of installing a gas analyzer system in a residential apartment building and installing explosion-proof windows.