A transom window changes the proportions of an entryway more than people expect. Even a standard-sized front door can look taller, brighter, and more custom simply by adding glass above it.
In many cases, the transom ends up doing two jobs at once: bringing more natural light into the entry while also making the entire front elevation feel less flat.
A door with transom window simply means there is a fixed glass section installed above the main door frame.
The transom can sit above:
A single front door
Double entry doors
A front door with sidelights
Oversized modern entry systems
Today, most transom windows are fixed and non-operable, designed mainly for light, height, and curb appeal rather than ventilation.
Why an Exterior Door with a Transom Window Feels More Expensive
One reason homeowners choose an exterior door with transom window is proportion.
A taller entry naturally feels more custom and architectural. Even on a modest home, adding a transom above the door can make the entrance look more balanced and substantial from the street.
Transoms also:
Bring more daylight into darker foyers
Make ceilings appear higher near the entrance
Break up large walls around the doorway
Add symmetry to wider facades
It’s one of the few upgrades that changes both the inside and outside appearance at the same time.
Single, Double Doors With Sidelights and Transoms
Transoms work with almost every entry configuration.
Some of the most common layouts include:
Single front door with transom above for narrower entrances
Double door with transom window for larger homes and wider openings
Door with sidelights and transom when maximum natural light is wanted
In many newer homes, the transom helps tie the entire entry together visually, especially when paired with taller doors or oversized glass panels.
A single door with a transom can add height without making the entrance too wide. Double doors with a transom create a larger, more formal entry, while sidelights combined with a transom work well when the goal is to bring as much natural light as possible into the foyer.
The best configuration depends on the width and height of the existing opening, the proportions of the front elevation, and how much glass you want around the door.
Types of Transom Windows Above Doors
Not every transom has to be a simple rectangular piece of glass. The shape of the transom can change the entire character of the entrance.
Common options include:
Rectangular transoms – the most versatile option and a natural fit for both traditional and modern doors.
Arched or half-round transoms – often used to create a more traditional or formal entrance.
Elliptical transoms – give the entry a softer curved shape without creating a full semicircle.
Custom-shaped transoms – useful when the existing opening has unusual architecture or when the transom is designed to follow the shape of the facade.
Rectangular transoms usually create cleaner lines, while curved transoms tend to become more of an architectural feature.
The right choice depends less on trends and more on the proportions of the opening and the style of the house.
Fiberglass, Steel, and Wooden Doors With Transom Windows
A wooden door with transom window has a classic look, but in Canadian weather many homeowners now choose fiberglass or steel instead.
Fiberglass offers:
Wood-grain finishes without warping or swelling
Better long-term stability in changing temperatures
Less maintenance over time
Steel doors are often chosen for:
Security
Clean modern lines
Larger glass configurations
The transom itself can use clear, frosted, SDL, decorative, or stained glass, depending on the style of the home.
Transom Glass Options
The glass in the transom can be chosen separately or coordinated with the glass in the door and sidelights.
Some common options include:
Clear glass for the maximum amount of natural light
Frosted or privacy glass when you want daylight without a completely open view into the foyer
Decorative glass when the transom is intended to become part of the overall door design
Stained glass for a more traditional entrance
SDL or grill patterns when the door design needs stronger architectural lines
If the entrance also has sidelights or glass in the door slab, using the same or complementary glass throughout the system usually creates a more finished appearance.
Privacy matters less in many transoms than it does in sidelights because the glass is positioned higher above eye level, but it is still worth considering how much visibility you want from outside.
Door and Transom Size & Proportions
The size of a transom matters just as much as the style.
A transom that is too shallow can look like an afterthought, while one that is too tall can overpower the door below it. The goal is to make the entire entry look like one balanced system rather than a door with an unrelated piece of glass added above.
When choosing the proportions, it helps to consider:
The width and height of the door
Whether the entrance has one door or double doors
The width of any sidelights
The total height available in the opening
Ceiling height inside the foyer
The proportions of nearby windows and exterior features
Wider entrances can usually carry a larger transom visually, while narrower entrances often look better with a simpler, more compact design.
On replacement projects, the existing rough opening often determines what can be installed without structural changes. If you want to increase the height of the complete door and transom system, the opening may need to be modified.
Door With Transom Window Replacement
A door with transom window replacement is usually more involved than replacing a standard front door.
In some homes, the existing transom can remain while only the lower door is changed. In other cases, the entire frame and upper glass section are replaced together for better proportions, insulation, and appearance.
Older transoms were sometimes designed to open for airflow. Modern systems are usually fixed, better sealed, and far more energy efficient.
The main thing is getting the sizing right. A poorly proportioned transom can make the whole entry look awkward, even with a good door.
Keeping the existing transom can make sense when the frame and glass are still in good condition and the new door will work with the existing proportions.
Replacing the complete door and transom system is usually worth considering when the existing transom is drafty, damaged, cloudy between the panes, poorly insulated, or simply does not match the new door design.
Replacing everything together also gives more flexibility to change the proportions, glass style, colour, sidelights, or overall appearance of the entrance.
Why Transom Windows Never Really Went Away
Transom windows became popular long before modern HVAC systems because they helped circulate air through homes.
Over time, they became less necessary for ventilation but stayed popular for one simple reason: they improve the look of an entrance.
A transom above a door adds height, light, and architectural detail without making the home feel overly decorative. That’s why they continue to work on traditional homes, transitional builds, and modern exteriors alike.
Door With Transom Window FAQ
A transom window is a glass section installed above a door. It is commonly used on exterior entry doors to bring more natural light into the home and make the entrance appear taller and more open.
A transom window is often called a door transom, transom above door, or transom over door. These terms generally refer to the same upper glass section positioned above the entry door.
No. While transom windows are most commonly installed above exterior doors, they can also be placed above interior openings, hallways, or standard windows for additional light and architectural detail.
Transom windows never fully disappeared. Older operable transoms became less common once modern ventilation systems improved, but fixed transom windows remain popular on front entry doors for natural light and curb appeal.
Yes, in some cases the lower door can be replaced while keeping the existing transom window. However, many homeowners choose to replace the full entry system together for better proportions, insulation, and appearance.
Modern transom windows are designed with insulated glass and energy-efficient sealing systems. When properly installed, they provide natural light without significantly affecting thermal performance.
Front door transoms can be rectangular, arched, half-round, elliptical, or custom-shaped. Rectangular transoms work with most contemporary and traditional entrances, while curved designs are often used when the transom is intended to become a stronger architectural feature.
Yes. The transom can use the same or complementary glass as the sidelights and door insert. Matching the glass pattern, privacy level, grills, or decorative design can make the entire entry look more cohesive.
In some homes, yes. It depends on how much space is available above the existing door and whether the wall and framing can accommodate a taller opening. Adding a transom where one does not currently exist may require structural and finishing work, so it is more involved than a standard door replacement.
