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We just finished one of our favorite kinds of projects: installing a Bonelli four-panel

in a brand-new home. But this one had a twist. Instead of opening to a patio or backyard, this wall of glass lives entirely inside the house.
Most people picture folding glass doors as the gateway to the outdoors. This project shows they can do just as much for the spaces between rooms. With a sleek, black-framed glass wall, the homeowners get a room that can be wide open to the main living area one minute and quietly closed off the next, without losing an ounce of natural light.
Here’s how a bare framed opening became one of the most striking features in the house.

The Before: A Framed Opening Waiting for Its Moment

That’s the beauty of working on a new build. There was no old door to tear out and no wall to cut into. The builder and homeowners had planned for this opening from the start, which let us focus on getting every detail right.
Still, an open archway leaves a lot on the table. The homeowners wanted this room to be flexible. Sometimes they wanted it connected to the rest of the house, and sometimes they wanted it separate for quiet, privacy, or to keep noise contained. A standard swinging door would have felt small in an opening this generous, and a solid wall would have blocked the light. They needed something that could do both.
Why a Bonelli Folding Door Indoors?
A folding door, often called a bi-fold, uses hinged glass panels that fold against one another and stack neatly to the side, opening up nearly the full width of an opening. This one has four panels. That makes it a natural fit for an interior space like this one, where the goal is to connect two rooms without permanently merging them.
Here’s why it made sense for this home:
• Open when you want it, closed when you need it. With the panels folded back, the room flows right into the main living area. Close them, and it becomes its own space.
• Light keeps moving. Glass panels let daylight pass from room to room. In the finished photo, you can see straight through to the window on the far wall, even with the door closed.
• A statement, not just a door. The slim black frames give the opening a modern, architectural look that turns a simple transition into a design feature.
• Right-sized for a big opening. A single swinging door would have looked lost here. A four-panel folding system fills the space in proportion.
• Smooth everyday use. Quality hardware means the panels fold open and closed easily, so the homeowners will actually open and close them day to day.
This room could serve many purposes: [home office, gym, playroom, den, guest space, or whatever it will be used for]. Whatever it becomes, the door lets it adapt.
The Installation: Doing It Right in a New Build
Installing during construction has real advantages, but it still takes careful coordination. Here’s how this one came together.
1.  Verify the opening. Before anything went in, we checked that the opening was square, plumb, and sized correctly. Small errors here turn into panels that drift or drag later.
3. Set the track. The bottom track has to sit perfectly level on the slab. Because the finished flooring wasn’t in yet, we could plan how the track would meet the floor for a clean final look.
4. Install the frame. The black aluminum frame was secured into the opening and aligned so every panel would line up.
5. Hang and adjust the panels. Each of the four glass panels were hung and fine-tuned so it folds smoothly and closes evenly with its neighbors.
6. Test and protect. We ran the door through its full range of motion, checked the hardware, and left the panels protected so the rest of construction could continue around them.

The After: A Glass Wall That Changes Everything

What a difference. The empty opening is now a crisp wall of glass framed in matte black, and it instantly gives the space a custom, high-end feel, even before the floors and finishes are complete.
Here’s what the homeowners gained:
• Flexible living. The panels fold open to connect the room with the main living area, or close to create a separate, defined space.
• Light that flows through the home. Daylight from the room’s window reaches the main living area even when the door is shut, so neither space feels closed in.
• Sound and privacy control. Closing the panels helps contain noise from a TV, workout, or video call without cutting the room off visually.
• A modern focal point. The slim black frames contrast beautifully with the white walls and will pair with just about any finish the homeowners choose.
• Room to grow. As the family’s needs change, the space can change with them, without any remodeling.
Once the flooring and finishes are in, this opening is going to be one of the first things people notice when they walk through the house.
Thinking About a Folding Door for Your Build?
An interior folding door could be a great fit if you’re building or remodeling and want:
• A home office that can close off for calls but stay connected the rest of the day
• A playroom or den you can see into from the kitchen or living room
• A home gym, media room, or guest suite that can open up for entertaining
• More natural light shared between rooms
• A true architectural feature instead of an ordinary door
If you’re in the planning stages of a new build, now is the perfect time to talk with us. Planning the opening early makes installation smoother and ensures the finished result looks seamless.
Ready for Your Own Before and After?
This project proves folding glass doors aren’t just for patios. Inside the home, they can create flexible, light-filled spaces that adapt to the way you live.
Contact us today at (406) 471-9644 / office@precisionglassmt.com to schedule a consultation. Whether your opening leads outside or to the next room, we’d love to help you make it unforgettable.