A typical property here is not a single front door. It is a pedestrian gate, a driveway gate, a front door, a kitchen door, a scullery or laundry door, a garage side door, a garden cottage and often a studio or converted outbuilding. Over the years each of those has been locked by whoever was available at the time, and the result is a key ring that opens some of them and a drawer of keys that opens the rest.
That makes key control the real work here, more than emergency opening. When somebody phones us because they cannot get into the cottage, the useful outcome is not just an open door — it is finally knowing what opens what. A properly designed master key system can collapse eleven keys into two or three without reducing security at all, and on a property this size it changes daily life.
The second constant is other people's access. Domestic staff, gardeners, pool services, contractors, a tenant in the cottage, a family member in the studio. Every one of those is legitimate and every one of them is a key you cannot fully account for once it has been out of your sight. That is the situation lock change services exist for, and in Oranjezicht it is a scheduled decision rather than an emergency.