Front house doors are also called door systems since these come pre-hung in the frame and usually predrilled for a deadbolt and knob. Unless the replacement door is just part of a bigger renovation project, you might want your new door to have a similar size as that of your old one. The addition of sidelights or going for a bigger door might mean that you need to redo the door framing surrounding the door, the kind of job that you would want to entrust to the hands of a professional contractor. In general, home centers provide referral or installation …