Abstract: A method for ascertaining a closing state of a house door or of a house window, having the following method steps: acquisition of a rate of rotation of the house door or of the house window using a first acquisition device, and calculation of an opening angle of the house door or of the house window on the basis of the acquired rate of rotation, and ascertaining whether the calculated opening angle falls below a prespecified angular threshold value; acquisition of a rate of vibration of the house door or of the house window using a second acquisition device, and ascertaining whether the acquired rate of vibration exceeds a prespecified rate of vibration threshold value within a prespecified first time span; and ascertaining whether the acquired rate of rotation exceeds a prespecified rate of rotation threshold value within a prespecified second time span since the exceeding of the vibration rate threshold value.