Divided Light Windows & Doors

Divided light windows are available in two primary styles: True Divided Light (TDL) and Simulated Divided Light (SDL). While they offer a very similar appearance, the way they are constructed—and the benefits they provide—are quite different.

True Divided Light (TDL)

A True Divided Light (TDL) window is built exactly as its historic predecessors were. Each individual pane of glass is a separate piece, divided by solid wood muntins that form the traditional grid pattern. This style was originally developed because manufacturing large sheets of glass was difficult and expensive, making smaller panes the practical solution for centuries.

Today, authentic TDL windows are primarily found on historic homes, landmark restorations, and custom residences where historical accuracy is essential. Very few manufacturers still produce genuine TDL windows with historically correct profiles. Stewart Brannen Millworks is proud to be among the few that continue crafting these traditional designs while preserving the architectural character that makes them so distinctive.

Simulated Divided Light (SDL)

As insulated glass became the standard for energy-efficient construction, Simulated Divided Light (SDL) windows were developed to provide the timeless appearance of divided lights without sacrificing modern performance.

An SDL window features a single insulated glass unit with decorative spacer bars positioned between the panes of glass. Matching wood muntins are permanently bonded to both the interior and exterior surfaces, creating the same dimensional look as a traditional divided light window.

From a normal viewing distance, it is extremely difficult to distinguish a high-quality SDL window from a true divided light window. Because SDL windows offer exceptional energy efficiency while maintaining classic aesthetics, they have become the preferred choice for many homeowners, architects, and builders—whether constructing a new custom home or renovating a historic property.

Endless Design Possibilities

Both TDL and SDL windows can be customized with a wide variety of grille patterns, muntin widths, and lite configurations to complement virtually any architectural style.

A classic example is the traditional entry door featuring a raised lower wood panel with a 2-wide by 3-high divided light pattern above. However, your options don't stop there.

Every Stewart Brannen Millworks window and door is built to order, giving you complete freedom to choose the size, proportions, grille layout, and overall design that best suits your home. Whether you're recreating a centuries-old historic pattern or designing something entirely your own, our craftsmen will work with you to create windows and doors that are as beautiful as they are enduring.