This contribution deals with a screening survey of electromagnetic emissions in various places of a typical residential unit of an apartment building located in České Budějovice (Czechia) with the connection of common electrical appliances. The TENMARS TM-190 Electromagnetic Field Meter was used for the measurement. The uncontrollable electromagnetic smog, it can have various negative consequences for the well-being and health of building users. The most sensitive organs to electromagnetic radiation are the skin, eyes, nervous system, and genitals. In the case of long- term exposure, headaches, stomach and skin problems, depression may occur, in the case of long-term exposure, spermiogenesis and cataract disorders, or the development of Unhealthy Buildings Syndrome (SBS) may occur. Electromagnetic fields should be minimized especially in rest areas, i.e., bedrooms because there is long-term exposure. The phase of a deep sleep, in which important mechanisms of regeneration, hormone production, and detoxification occur, can be significantly disrupted by electro-smog.