 The box bay window, as its name implies, is a bay window that’s shaped like a box. Similar to a conventional bay window, it is actually a set of three windows that project out from the house wall, typically a large center window flanked by narrower ones at each side. With a normal bay window, those side windows return to the wall at a 30- or 45- degree angle, but a box bay’s two side windows are perpendicular to the house wall. Box bay windows are very effective at opening up a space so that it feels—and actually is—larger and brighter without the need for moving walls.
Most large window manufacturers produce wood, vinyl, or aluminum box bay windows as pre-assembled kits, often consisting of casement windows secured by plywood platforms at the top and bottom. The unit is designed to fit into a conventionally framed opening; support brackets, or a cable that fastens to framing above, add support to the cantilevered assembly. The window box is capped with a small roof or covering, which may or may not be part of the kit. Finished trim—seat and head boards and extension jambs—complete the job once the window is in place.
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