It is undisputed that the electric and magnetic fields from domestic electrical installations and telecommunications affect humans. After an overview of the properties and effects of electric and magnetic fields, the authors explain the limit values for fields and radiation in residential buildings as demanded by building biologists and environmental medicine specialists. They describe how fields and radiation are measured and provide tips and recommendations for avoiding risks. The text thoroughly demonstrates how a low-radiation living environment can be created in both new and existing buildings through technical measures and structural precautions.