What Are Mullions in Cabinet Doors? When and Why You Need Them
If you’ve been searching for new kitchen cabinet doors and drawer fronts, you’ve probably come across a few terms that weren’t familiar at first.
All of a sudden, you’re learning about full overlay vs partial overlay, Blum soft close hinges, and the difference between raised panel and flat panel cabinet doors.
Then the word mullions shows up, and it feels like another rabbit hole.
At Cabinet Doors Plus, our goal is simple. We build cabinet doors that are strong, stable, and made to last, and we give you clear information so you can order with confidence.
If you’re ordering custom cabinet doors online, here’s what you need to know about mullions.
Key Things to Know About Mullions
- Mullions are not required on cabinet doors within standard industry size ranges
- Mullions are part of the cabinet door construction and cannot be removed
- Mullions are not an add on piece. They are built directly into the stiles and rails
- Mullion width may vary slightly depending on the cabinet door style
What Is a Mullion on a Cabinet Door?
A mullion is a vertical or horizontal support bar built into oversized cabinet doors to provide structural strength and prevent warping or twisting over time.
It can run:
- Vertically from top to bottom
- Horizontally from side to side
At Cabinet Doors Plus, mullions are fixed and permanent. They are recommended on cabinet doors that are 24 inches wide and or 48 inches high.
All mullions are constructed from the same durable wood species as the cabinet door itself, including:
- Cherry
- Maple
- Maple Paint Grade with MDF panel
- Red Oak
- Walnut
- White Oak
- Rift Cut White Oak
When Is a Vertical Mullion Recommended?
A vertical mullion is recommended any time you order a cabinet door that is over 24 inches wide.
Placing a vertical mullion in the center of the door adds strength and stability, helping prevent long term movement.
When ordering online, you will automatically be prompted to include a vertical mullion when your door exceeds this width.
When Is a Horizontal Mullion Recommended?
A horizontal mullion is recommended for cabinet doors that are over 48 inches tall.
Adding a horizontal support bar across the center improves durability and keeps the door stable over time.
Just like vertical mullions, this will be automatically prompted during the ordering process when applicable.
Why We Add Mullions to Oversized Cabinet Doors
Our goal is to build long lasting, reliable cabinet doors and drawer fronts.
By including mullions in oversized custom cabinet doors, we add the structural support needed to prevent bowing, warping, or twisting after years of use.
All Cabinet Doors Plus products are custom made. Adding mullions at the right time ensures long term durability and consistent performance.
Appearance Matters Too
Mullions are not just structural. They also improve the overall look of larger cabinet doors.
They create a more balanced, proportional design and help distribute weight more evenly, especially for glass panel cabinet doors.
Like every part of our product, mullions are crafted with the same attention to detail as the rest of the door.
Order with Confidence
If you’re ordering custom cabinet doors online, details like mullions matter. They aren’t just optional add ons. They are part of building a door that will hold up over time.
At Cabinet Doors Plus, we guide you through the process so you get exactly what you need without second guessing.
Start Your Order
Ready to order custom cabinet doors built to last?
- Get the right fit for your kitchen
- Choose from quality wood species and styles
- Order with built in structural support where it matters
Start your order today and get custom cabinet doors delivered in as little as 10 to 15 days.