Patio and balcony doors are generally located at the back of a building, and therefore not open to public view. More than 40 % of all burglars use the patio or balcony door to gain entry. That makes the patio door the most popular target for burglary, both in one-family and multi-family homes. Therefore, the right burglary protection is very important. When buying a patio door, pay attention to lockable door handles, which make it more difficult for burglars to open the door from inside after having cut a small hole in the window pane. Fittings with mushroom head lock and anti lift devices prevent the doors from being forced upwards or pried open – one of the most common ways burglars enter the home. In addition, the use of penetration-resistant safety glass for balcony and patio elements is to be considered. The German industry norm DIN EN 1627 defines a number of different burglary resistance classes (RC) in order to classify burglary-resistant components used in construction. The police recommend the use of burglary protection class RC 2 for patio and balcony doors.