Sliding doors possess more advantage of the amount of space that is left available if there is not a clear path for a swing door. 

Sliding doors also have a few disadvantages, the key demand is that the space must be available either within the wall or next to a fixed panel of glass or other material which does not move.

The wall containing a pocket door does not have the structural strength or the versatility of the stud wall which could support it. The structure on either side of the door pocket is very flimsy, and heavily relies on the strength of the wallpanel for its rigidity. In the case of a glass panel, it cannot be used as wall space.

The hardware of sliding door is not capable of being made to withstand heavy use. The hardware could bear if the traffic is light, however, when the duty limits are exceeded, frequent breakdowns occur, and these are a true pain which must be dealt with immediately to ensure access to the space.

There are expensive alternatives using motorized openers , but even though these are expensive, they are easy to break, and operation while they are broken is also a pain.

And then there's the biggie,sliding doors may not be used for all of the above reasons anywhere in an exit path or required access to a space. This is by code in nearly all jurisdictions. All doorways must be usable at all times including the emergencies like fires, panics etc..

In terms of utilization of space, sliding doors and pocket doors are an architects dream, but the practical considerations make it more usual to use swing doors for most applications.

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