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Design & Architecture|Toronto

Transom Windows Above Doors: Modern Design Meets Natural Light

Eugene Kuznietsov
Written ByEugene Kuznietsov
February 13, 2026
5 min read
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Too Long; Didn't Read

  • Definition: The window sitting horizontally above a door or another window.
  • The Benefit: Adds light to a dark hallway while maintaining privacy (it's too high to see through).
  • The Cost: Cheaper than buying a taller door.
  • Structural: You need a header beam above the transom, not between the door and transom.

Answer First: A Transom window is the design hack for dark foyers. Instead of buying an expensive 8-foot custom door, buy a standard 6'8" door and put a 16-inch transom on top. It looks grander, costs less, and lets in light.

Types of Transoms

  1. Rectangular: The classic modern look. Fixed glass.
  2. Arched (Fanlight): The Victorian / Georgian look.
  3. Operating: In the old days, these tipped open to let hot air out. Today, 99% are fixed (sealed) for energy efficiency.

The Structural "Gotcha" (Load Bearing)

If you have a standard door and want to cut a hole to add a transom "retroactively," you have a problem. The "Header" (the wood beam holding the roof up) is sitting right on top of your door. To add a transom, you must:

  1. Rip out the drywall.
  2. Install temporary jack posts to hold the roof.
  3. Move the structural header up by ~18 inches.
  4. Re-frame.

Cost: Steps 1-4 cost about $2000 in labor. Verdict: Only add a transom if you are doing a full renovation or if there is already a "bulkhead" of empty space above the door.

Privacy vs. Light

Transoms are perfect for bathrooms or front doors facing the street.

  • Clear Glass: Maximum light.
  • Frosted: Soft glow, zero visibility.
  • Address Etching: We can sandblast your house number (e.g., "42") onto the clear glass.

Summary

If you have the height, fill it with glass, not drywall.

Want a Grand Entrance?

We design custom entry systems with matching sidelights and transoms. See our gallery for ideas.

Eugene Kuznietsov

Eugene Kuznietsov

Co-founder & Marketer

Co-founder of Installix, digital marketer with 11 years of experience and AI enthusiast. Passionate about making Installix the fastest growing window and door replacement company in Toronto and GTA.

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