Marvin Signature Ultimate Bi Fold Door, In-swing French Door, Double Hung Window, and Double Hung Picture Window

Bi-Fold Doors

Bi-fold doors, also known as folding or accordion doors, have two or more folding hinged panels. They are a popular style for patio doors.

What are Bi-Fold Doors?

Bi-fold doors, also called folding or accordion doors, consist of multiple panels hinged to each other that fold open and close like an accordion. Interior bi-fold doors are often used for closets or pantries and usually have two panels. Exterior bi-fold doors can feature many floor-to-ceiling glass panels and open to present an entry and exit space up to 55 feet long.


Bi-fold doors are ideal for spaces with stunning views and sweeping vistas and can strengthen a room’s connection to the natural world. Their panels stack up against the edge of an opening, meaning they take up less frame area compared to large-paneled sliding doors. This space-saving design means bi-fold exterior doors are great for high-traffic areas like patios or decks. Some bi-fold doors come fitted with a traffic door on one panel that allows easy passage in and out without having to open the larger panel.

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