A roofline is the outline or silhouette that a building's roof makes against the sky. When you look at a house from the street, the roofline is the shape you see where the roof meets the air: maybe peaked triangles, gentle slopes, or flat edges.

Architects pay close attention to rooflines because they dramatically affect how a building looks. A Victorian mansion might have a complex roofline with multiple peaks, turrets, and steep angles, while a modern house might feature a simple, clean roofline with one or two slopes. The roofline of a barn is instantly recognizable, with its high peak designed to store hay in the upper level.

When people talk about a neighborhood's character, they often mean how the rooflines work together. Drive through an older suburb and you'll notice similar rooflines creating a unified feeling. Builders sometimes intentionally vary the roofline when constructing homes side by side, adding visual interest by changing heights and angles so houses don't look identical.

The term can also refer to where two different roof sections meet, creating a line across the top of a building. These lines aren't just decorative: they help determine where rain runs off and how snow accumulates in winter.