Any amount of effort brought into the selection of your door locks down to its installation is useless even if you have the tools necessary to do everything to keep it secure if none of its components including the door itself and the frame were measured beforehand. You've probably heard of "measure twice, cut once" in the woodworking sphere. There's a good reason for that. Anything deducted from a piece that wasn't measured properly cannot be put back without it looking like a mistake.
Although fixing gaps that are too small or big when a door has to be shut and opened is possible, it's possible for it to look like an eyesore that anyone cannot overlook easily. It's much more cost effective to spend extra time before installation and such to measure how everything should look and fit. By preparing yourself for every possible mishap that could happen, you significantly decrease the possibility of damage or further costs related to what you assume is already done perfectly, your security. Your best course of action is to contact your local professional locksmith as well if you're in need of their expert opinion.
If this sounds like something you'd like to read more about, feel free to contact us at our highly informative website, look through some of our details and services on our GMB Page, or check out the reviews of our customers on our Facebook Page. Contact us anytime, our group of friendly locksmiths at Locksmiths of Belfast would love to help you out.