An open and uncluttered environment which provides a clear, well-lit view of the sales area from outside is a deterrent to armed robbers. Minimise curtains, posters and advertising materials which obscure vision, as they provide cover for bandits. Bars on windows may be necessary. Get rid of louvres. If you count money at night, make sure the premises are secured and you are not visible from outside.
Design counters to maximise space between staff and customers.
Deep counters with raised floors behind make it difficult for offenders to assault staff. Make sure they are well maintained and serviced regularly. Mirrors allow staff to monitor otherwise blind spots, but make sure they don't allow offenders to see behind the counter. By carrying out a risk assessment, a security consultant can help you choose the right strength. Staff should note any suspicious behaviour and report it to the police.