The lock, the knobset, and the hinges are the three main components of door hardware. Some door hardware sets, particularly less expensive models, come complete with all of these components, which can be a great option if you are fitting out a large number of doors on a budget. However the knobs, latches, locks and hinges are also available as separate elements that you can mix and match to create a custom solution. When choosing your door hardware, you must make a number of aesthetic and practical decisions.
1. Choose what type of lock the door will need. Consider the door’s function–do you need to lock it, or just close it? Do you need to be able to lock the door from the inside, i.e. for a bathroom door? In most cases, interior doors will only need a standard latch which allows the door to close securely without locking it. However if you are choosing hardware for a door which requires a higher level of security, for example an office, consider a three-lever mortice lock, which will allow you to lock the door with a key.
2. Decide what style of knob you would like your door to have. The two main styles are a “knob” or a “lever.” Selection depends on three things: personal preference, the style of your house, and the function of the door. If you are installing double interior doors or “French” doors, levers are more commonly used. Levers are also typically easier to open, which can be important for those with diminished strength (for example, the elderly) or if you have your hands full!
3. Select your preferred finish. Door hardware is typically available in brass, bronze, chrome or brushed steel. This decision largely depends on the style of your home. Brass and bronze are associated with older house styles, whereas chrome and steel finishes have a more modern feel. If your other fittings in the house are predominantly one finish, for example the light fittings or kitchen appliances, it’s best to keep things consistent.
4. Choose the hinges for your door. The hinges are largely determined by the size and weight of the door. The heavier the door, the larger the hinges need to be. It’s best to consult a carpenter or hardware specialist for this one. Over time, hinges that are too small or weak for the door can warp and fail.
(eHow.com)