This document provides information about bay windows, including their introduction, applications, construction, finishes, types, environmental relevance, advantages, and disadvantages. Key points: - Bay windows project outward from the main walls of a building to form an interior recess and admit more light than flush windows. - They provide maximum natural light and ventilation, security with a panoramic view, space for window seats or desks, and aesthetic appeal to elevations. - Construction involves headers, corbels or load bearing supports, angles typically from 135-170 degrees, and materials like timber, aluminum, concrete, or PVC. - Bay windows increase energy efficiency by allowing natural light/ventilation and reducing energy costs. They provide