A behavior monitoring system for monitoring the behavior of a person in a building comprises: o walking activity sensors integrated in or concealed by permanently installed finishing work on the building, the walking activity sensors configured for producing a measurement signal indicating when the person is walking on a walk-on-able surface of a flooring that is part of the finishing work and o an evaluation system connected to the walking activity sensors so as to receive the measurement signal for processing. The evaluation system is configured to extract gait characteristics from the measurement signal, to log at least part of the gait characteristics in a database, and to identify development trends in the logged gait characteristics indicative of evolution of the persons behavior. The evaluation system may also generate electronic reports on the persons behavior, the electronic reports including notice of any suspected evolution of the persons behavior. 93285
