| Awning | Hinged at the top and opens outward, usually with a crank. | Commonly rectangular; often positioned above doors, sinks, or other windows. | Ventilation during light rain and airflow in compact spaces. | Projects outward, so allow clearance from walkways and nearby structures. |
| Hopper | Hinged at the bottom and tilts inward from the top. | Usually a small rectangle placed high on a wall or in a basement. | Ventilation and daylight where privacy or limited wall space matters. | Its inward swing needs clear space inside the room. |
| Tilt-and-Turn | Tilts inward at the top for ventilation or swings inward from side hinges for access and cleaning. | Typically a tall rectangle used in bedrooms, living areas, or upper floors. | Flexible ventilation, convenient cleaning, and controlled opening. | Requires interior clearance; hardware and installation need careful adjustment. |
| Clerestory | Fixed or operable; operable versions may use awning or hopper mechanisms. | A horizontal band of windows set high on a wall, often near the roofline. | Bringing daylight deeper into a room while preserving wall space and privacy. | High placement can make manual operation difficult without suitable hardware. |
| Corner | Usually fixed, or formed from adjoining operable units designed for the corner. | Glazing meets at an exterior building corner, sometimes with a minimal visible frame. | Broad views, increased daylight, and a strong connection to outdoor spaces. | Corner detailing affects structural support, weatherproofing, and energy performance. |
| Arched | Often fixed; some designs combine an operable rectangular section with a fixed arch. | Curved at the top and placed above doors, standard windows, or as a focal feature. | Adding architectural character and admitting daylight in a distinctive shape. | Custom shapes may increase fabrication costs and limit replacement options. |
| Round or Oval | Most commonly fixed, with specialty operable versions available. | Circular or elliptical; used in gables, stairwells, bathrooms, and feature walls. | Creating a focal point and adding daylight where a standard rectangle is unsuitable. | Fixed units provide no ventilation; verify glazing and framing specifications. |
| Skylight | Fixed or operable; opening models may be manually or electrically controlled. | Installed in a sloped roof and sized to suit the room below. | Daylighting interior rooms with limited exterior wall access. | Roof flashing, insulation, and condensation control are essential to reduce leak risk. |
| Roof Lantern | Usually fixed, though some designs incorporate opening roof vents. | A raised, glazed structure set into a flat or low-slope roof. | Filling large central spaces with overhead daylight and creating a visual focal point. | Requires careful design for solar heat gain, drainage, and roof load. |
| Glass Block | Typically fixed, with ventilation supplied by separate nearby windows or vents. | Built from translucent blocks in a wall, often in bathrooms or stairwells. | Soft, diffused daylight with greater visual privacy than clear glazing. | Does not usually provide an operable opening; block assemblies are relatively heavy. |