If you are an employer then you have a responsibility to ensure the safety of your employees whilst in the work place. Often much of this is down to health and safety such as fire procedures in place, buildings that are safe and that all equipment being used has been tested to the right standard. But you also need to consider the security. If your employees will be handing money then you need to make sure that they have a safe place to do so and that they know what to do should their safety become compromised. A good example of this would be in a bank.
Not only do you need to ensure that your employees are kept safe whilst at work but that the building is secure when left unoccupied. Some building will constantly have security guards on or around the premises but you may need to install alarms, CCTV and other anti theft devices.
Many security firms will happily come out to your business premises and take you through any security concerns that they may have and how you can rectify them. They will of course be trying to sell you something but you can always get a second opinion if in any doubt. If you have had a previous break in or security issues then the police may well advise you of how you can make the building more secure in the future to try and avoid it happening again.