Window security is one area that I’ve not really thought a lot about since moving into a brand new house a few years ago. It came with the latest design of upvc double windows and doors. The windows incorporate a ‘half lock’ system which means I can shut the handle down when the window is still very slightly open. I don’t have any means of locking an actual open window because there are no window stays on which we can screw down a locking device like we used to have on older windows. Obviously with any locking mechanism involving an open window, the most determined burglar will get in, whatever you put in their way. All sorts of devices are on the online market,if you research ‘window locks’, and there are blogs on ‘how to’. But for peace of mind, engaging the services of a window lock specialist is the best way to make your home more secure if this is a matter that concerns you.