Which window type extends outward to form a bay inside the room?

• A. Dormer
• B. Bow window
• C. Oriel
• D. Bay window

Answer: (D)

Extending outward from the exterior wall to create a recessed interior space defines a bay window. Its outward projection is typically polygonal (often three panes with the side panes angled), which creates a distinct bay or alcove inside the room, often felt as a small nook with extra light and seating or display area.

Dormers sit in a roof surface and add headroom and light up high spaces, not a true interior bay. Bow windows also project outward but form a curved, rounded exterior with a more uniform curve, which doesn’t create the defined interior bay shape as clearly. Oriel windows project outward and are supported by brackets or corbels, but they don’t typically produce the same interior bay alcove.