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The cost of folding patio doors is higher than the typical patio door cost because of their size, complex mechanisms, and additional hardware needed to operate them. These doors may stretch as far as 18 feet, require specialized installation from an expert, and have many more moving parts that could malfunction if not installed carefully.

Pocket and standard doors are similar in price, but pocket doors cost more to install than standard doors. Professionals usually charge around $150 to $200 to hang a standard door. But if you're installing a pocket door on an existing wall, you'll likely pay between $1,000 and $3,500. 

Not every door can be converted into a pocket door. Pocket doors require specific hardware and a hollow space within the wall to slide into when open. The door must be sturdy enough to handle the sliding mechanism but not too heavy, as excessive weight can cause operation and track alignment issues. While some standard interior doors can be adapted for use as pocket doors with the right hardware, it's essential to ensure the door's compatibility and the structural feasibility of creating a pocket in the wall.

Standard door sizes aren’t one-size-fits-all, but there are common go-to dimensions. For exterior doors—like your front door—36 inches wide by 80 inches tall is typical, though you’ll see 30- or 32-inch widths too, especially in older homes. Interior doors vary more. Bedrooms and bathrooms often use 30- to 32-inch widths, and closet doors can be anything from slim singles to wide bi-folds. Height is usually 80 inches across the board; however, always measure your actual opening. “Standard” only works if it matches what’s already in place.