Window Grills (Muntins & SDLs)

Window grills are decorative or functional elements that divide a window into smaller visual sections. In commercial applications, they are often used to:

• Reproduce traditional or colonial architectural styles
• Break up large expanses of glazing for visual balance
• Coordinate with nearby properties or zoning requirements
• Add depth, symmetry, and shadow lines to a façade

Grills may be applied to the surface (SDLs), installed between panes in an IGU (internal grills), or fully divided with individual lites (TDLs) in heritage settings.

Installing new IGUs and want grills inside the unit?

Learn more on our Sealed Units (IGUs)

Centennial Glass provides both grill specification for new builds and exact-match replacements for failed or outdated glass panels with grills. We work with storefronts, punch windows, vestibules, and curtain wall panels.

• Matching internal grill color, profile, and configuration
• Surface-applied SDLs for new or retrofit IGUs
• Grill alignment for multi-panel systems and façades
• Resealing or reglazing units with faded or damaged grills
• Decorative or custom grill patterns for brand-aligned spaces

Replacing fogged glass or broken panels with grills?

Visit our Commercial Window Repair

We install and restore grills in a wide variety of commercial environments, including:

• Offices and mixed-use developments
• Schools, universities, and institutional buildings
• Government and municipal buildings
• Healthcare and wellness centers
• Retail storefronts and hospitality venues
• Heritage restorations and zoning-controlled façades

Grills are often used to preserve historic visuals in adaptive reuse buildings or to bring human scale to large glass installations in urban and suburban developments.

Also working on historic or segmented façades?

Explore Punch Windows

We offer a variety of grill styles, colors, and materials to align with your project’s design goals:

• Internal grills (in sealed units) – maintenance-free, energy-efficient
• Simulated Divided Lites (SDLs) – surface-mounted for depth and realism
• Colonial, Prairie, Ladder, and Custom Patterns
• Flat, pencil, or contour profiles
• Grill-in-glass spacers and warm-edge compatibility

Our team ensures that every grill system aligns with your unit’s spacer thickness, tint, and coating for flawless appearance and performance.