Invest in a reputable burglar alarm with, if possible, an armed back-up response.
Ensure that all windows and apertures are securely burglar-barred and that latches are well serviced and efficient.
Be certain that all doorways, especially those providing external access, are strong and durable.
Consider the installation of frosted glass windows in areas of your shop that contain high-priced or valuable items.
Equip your premises with good interior and exterior lighting by night.
Control the keys of your premises strictly.
If keys are lost or go missing, report it to the police as soon as possible.