It’s easy to fall into the trap of believing that any lock will improve your home’s security, but in reality the benefits of the wrong lock are actually seriously limited. Upgrading or replacing locks is as complicated as installing them in the first place, and in all cases if it’s an exterior door or window you’re dealing with then you really do need to approach an accredited locksmith before making the change. Outside of accredited locksmiths, not all suppliers will in fact be selling locks that have been fully vetted and produced in line with international standards. You also can’t be sure that you have the right lock for your particular door or window, and you might not know this for certain until after you’ve damaged the very thing you’re trying to make more secure.
One very useful tip to bear in mind is that you probably want to look into patented or restricted locks: these are both excellent ways to ensure that you are in control of who has a key to your home and how easy it is to obtain such a thing.