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Bifold windows work by using a track that allows panels to slide to the side and "stack" so they take up minimal space, leaving the largest opening. The sashes connect to each other with butt hinges or concealed hinges and to the window frame with the same type of hinges you’d find on a casement window. Some manual bifold windows also have casement stays or another piece of hardware to keep your windows in place when they’re open.

The cost of window replacement is about $290 per window on average, with a typical price range of $180 to $410. However, costs can be as low as $100 or as high as $780 or more. The total price depends on several factors, including the size, type, brand, and number of windows being replaced. The frame material and glass type also significantly impact the cost.

• Frame Material Costs (per window):

• Aluminum: $275

• Vinyl: $550

• Wood: $800

• Composite: $900

• Fiberglass: $1,250

• Glass Type: Simple double-glazed windows are cheaper ($3 to $6 per sq. ft.) than stronger tempered glass ($12 to $14 per sq. ft.).

The material around a window is simply called the window frame, but the individual pieces also have different names. The top portion of the frame is called the head, the side pieces are called jambs, and the bottom portion is called the sill. If you have multiple windows next to each other, you’ll also have a mullion, which is the frame piece that separates the individual windows. Windows stacked on top of each other are separated by a horizontal frame piece, which is called a transom.

Windows with muntins are slightly more expensive because you’re paying for more material, but the cost shouldn't be that much higher since most muntins are fake on modern windows. You’re looking at a cost between $25 and $100 more per window for muntins, depending on the type. The only exception is if you want custom muntins to match your home style or meet your personal preference. Most manufacturers will charge more for these as they can’t mass-produce them. Windows with true muntins are rare, and they’re much more expensive upfront and over time if you ever need individual glass replacement.