According to a new study by market research firm The Freedonia Group, demand for windows and doors in the U.S. will grow 6.9% per year to reach $31.9 billion by 2018. But what kind of windows and doors will homeowners buy? Manufacturers such as Masonite, Nanawall, and Marvin are thinking big. Here’s a collection of windows and doors with folding panels and huge panes.

Nanawall’s SL80/81 folding series is an aluminum-framed window featuring narrow stiles and panels with glass fiber thermal break for energy efficiency. The window is available in two profile options: The SL80 has a rounded profile, while the SL81 has a more angular profile. The folding panels come in sizes up to frame heights of 10 feet tall and widths of 3-feet-by-2-inches. 800.873.5673,

Masonite’s VistaGrande flush-glazed fiberglass entry doors are designed to offer wider viewing areas and create a clean, modern look that lets in plenty of sunlight. Customers can choose stile and rail features to achieve an authentic wood appearance, or glass options including clear, pear texture, and chord texture. The door is also available in numerous internal grille designs. 800.895.2723,

Jeld-Wen’s custom folding window incorporates an accordion-style design to make rooms look and feel larger. The window comes in sizes as large as 24 feet, but can be combined to create a 48-foot opening. Each window is made with LoE3-366 insulating glass and can be customized in a variety of textures, patterns, and colors. 800.535.3936,

Marvin’s Ultimate Multi-Slide Door is available in large sizes, with widths up to 50 feet wide and heights up to 12 feet tall. The door features pull-and-latch hardware with wheels to minimize effort while operating. The product is also available in pocket door panels that disappear completely into the wall, as well as a stacked-panel configuration. 888.537.7828,

LaCantina’s Contemporary Clad door system features a 2 15/16-inch narrow stile and rail profile to maximize glass and light. Despite the window’s increased viewing surface, it meets energy code demands and offers structural integrity with 2 1/4-inch thick panels made of LVL core construction and extruded aluminum. The window is available in several colors including white and bronze. 888.221.0141,