Window Mullions vs. Window Muntins: What is the Difference?

Many homeowners confuse window mullions for window muntins and vice versa. Even contractors and remodelers are often confused. However, what are they exactly, and how can you tell them apart?

In essence, both mullions and muntins create decorative window grids -- though often they also serve practical, structural purposes as well. A mullion is a vertical bar that separates complete window units. Modern mullions for home windows are typically made of wood or metal, but not always. While their main purpose is to create an aesthetic divide within the window, they may also provide support for an arch.

Muntins are very similar but different. Historically, the term “muntin” could be applied to any vertical divider, whether for a window, door, or furniture. Nowadays, you mostly hear it about windows. Builders originally employed muntins to ensure their windows were structurally sound while separating the glass and holding it in place. Unlike mullions, which divide window units, muntins divide individual panes of glass. Muntins came about because it was more affordable to produce small glass panes; while that is no longer the case, they still add character and support to your exterior.

Are you still confused about the difference between window mullions and muntins? Talk to the team at Fixhome to learn more about these components and all other window parts.