Patio doors were originally created to replace French doors, offering an uninterrupted view of the natural daylight coming into the house, and providing easy access to the outdoors. As a result, patio doors are still hugely popular and due to demand, have become somewhat more elaborate over the years. However, they were not completely able to replace French doors; whereas the style and design of a French door is still seen as a classic and timeless look. However, the two are able co-exist on the market, benefiting the home-owner who has a choice of door options to consider.

At one point, a patio door was not a very secure entryway and easily accessible from the outside. Over time improvements have been made so now this is not as great an issue as it previously had been. There is also another issue of safety because the door, being a solid sheet of glass, is often seen as being open when it is actually not. To help remedy possible injuries, safety glass is now used to prevent people, especially children, from running headlong into the closed doors and getting severe lacerations.