Often, when homeowners start thinking about new windows, the conversation centers on frame material, operating style, and glass options. Yet another overlooked decision is choosing between mulled and non-mulled windows. These two approaches impact how your windows are installed, how much natural light enters your home, and how flexible your design choices can be. Compare each option to help you feel confident picking what works best for your space.
What Are Mulled Windows?
Mulled windows are two or more separate windows that have been structurally joined together to create a single, larger unit. The process, known as window mulling, uses a special kit or reinforcement to connect the frames. This creates a clean, unified look that allows for more glass and less framing between the individual windows.
Bay and bow windows are recognizable examples of mulled windows. A bay window usually combines three units—often a large picture window in the center with angled side windows—while a bow window uses four to six units arranged in a gentle curve. In both designs, the windows are structurally joined through window mulling.
Benefits of Mulled Windows
- More natural light: Connecting multiple windows into a single unit provides a wider glass surface and gives the room a brighter feel.
- Clean, streamlined look: Mulled windows minimize the amount of framing that interrupts the view. The trim looks unified and polished.
- Design versatility: A mulled unit can combine different window styles, such as a picture window flanked by casement or double-hung windows.
- Energy efficiency: High-quality mulled windows are engineered to maintain efficiency. When installed correctly, they keep your home comfortable throughout the year.
- Great for large walls: Big living spaces with vaulted ceilings often benefit from the expansive feel of a mulled setup.
What Are Non-Mulled Windows?
Non-mulled windows are installed as completely separate units. Each window has its own frame, trim, and opening. Instead of combining them into one large unit, they sit side by side or above one another with several inches of wall surface between them.
Benefits of Non-Mulled Windows
- Classic appearance: Non-mulled windows often complement traditional or historic homes. Each frame stands on its own, giving the facade more texture and definition. The windows look like intentional architectural features rather than one continuous expanse of glass.
- Simpler replacement: If one unit is damaged, it can be replaced individually without affecting adjacent windows.
- Lower upfront costs: Non-mulled windows are typically less expensive to install because they don’t require the reinforcement kits or structural adjustments that mulled windows need.
- Practical for smaller spaces: Individual, non-mulled windows are easier to handle and install in homes with tight access because each unit is set independently rather than as a single, large structure.
How to Choose Between Mulled vs. Non-Mulled Windows
As you consider your options, weigh which priorities are most important to you. Here are a few tips to guide your decision:
- Evaluate your space: Large living rooms and open-concept areas often benefit from mulled windows. Smaller bedrooms or hallways may feel more balanced with individual, non-mulled windows.
- Think about future maintenance: Replacing one damaged unit is easier when windows are not mulled together. If long-term flexibility matters, non-mulled may be the right call.
- Factor in energy costs: Both styles can be energy efficient if you choose high-quality products from well-respected brands and prioritize professional installation.
- Match your architectural style: Modern homes often look best with the smooth, continuous design of mulled windows. Historic or traditional homes usually benefit from the detail and separation of non-mulled options.
- Consider your budget: Non-mulled windows often cost less initially, while mulled windows may increase curb appeal and home value. Both are smart investments when properly installed.
- Work with a professional: Window placement and structural considerations affect whether mulling is the right choice. A consultation ensures you know what is possible and practical for your home.
Picture a homeowner who wants to update their dining room with bigger windows. Choosing a mulled unit lets them connect three tall casement windows into one seamless wall of glass to soak in the scenery while hosting dinner parties. Compare that to a couple living in a historic home, where non-mulled double-hung windows keep the original charm while still improving energy efficiency. These examples show how lifestyles and architecture influence the decision.
Install Mulled or Non-Mulled Windows with Our Help
Whether you prefer the seamless look of mulled windows or the traditional appeal of non-mulled windows, expert installation is the key to maximizing your investment. STL Windows Direct has over 50 years of industry experience and a reputation built on trust. Our local, family-owned business serves homeowners throughout St. Louis, Jefferson City, Columbia, and the Lake of the Ozarks. We deliver premium windows, premium install, premium service without the premium price. If you’re considering new windows, schedule a consultation with us today. We’ll help you decide whether mulled or non-mulled windows will work best for your home.