The feeling of safety is one of the primary needs of every human being. We want to feel secure on the street, in the loft, when travelling or during organised events. Nevertheless, we care most about safety in our own houses. None of us would consciously buy a product which could put our safety in jeopardy. A roof window is a specific product, installed in the roof structure above users' heads and sometimes it happens that work has to be carried out on the roof. Hence, windows have to ensure user's safety and guard against unauthorised access to the building.