One key that opens everything for you, and keys that open only what each person needs — the cleaner gets the corridors, the tenant gets their own door, and you get all of it on a single key.
The chart matters more than the keys
We design the hierarchy with room to grow, document it properly, and hold a copy so that adding a floor in two years does not mean starting the system again. When a key goes missing, the chart tells us exactly which cylinders need rekeying and which do not — which is usually the difference between a two hundred dollar job and a two thousand dollar one.
