The majority of standard windows and patio doors built today are usually designed in such a way to optimise heat insulation and noise protection. Not, however, protection against intruders.
The reason for this is that standard elements are frequently only “secured” by so-called rollers (see illustration). These rollers are built into in around 80 percent of the windows and patio doors on the market. They ensure that the window seals properly but don't offer any mechanical protection against attempted break-ins. Intruders who are reasonably adept can open windows that are only fitted with rollers in just a few seconds using a standard screwdriver. Prying open a window in this way is also a relatively noiseless procedure. The so-called rollers are simply pushed to the side causing the window to spring over the latch and enabling it to open. This also shows that lockable window handles serve, at the most, to protect children but don't really have much to do with break-in protection. The window handle only operates the mechanics but has no effects on the elements that serve to keep the window closed.
Closed standard roller shutters don't offer adequate protection against intruders since they can simply be pushed up; at the most they offer protection when you are at home. What's more, many break-ins take place at times when the roller shutters are not in use and are rolled up. So-called roller shutter locks that prevent the shutters from being pushed up by blocking the element offer additional protection but should only be used to supplement mechanical locks.
To effectively prevent break-ins, properly installed security fittings are required on both sides (locking and hinged sides) of the window or patio door.