Your Trusted Bifold Door Manufacturer
At Grandsea Windows & Doors, we manufacture and export premium bifold door systems for large-scale residential and commercial projects, our folding doors combine modern aesthetics with long-lasting performance — making them the ideal choice for importers, wholesalers, contractors, and architects.
Built with advanced hinge and guide technology, our bifold doors maximize usable space, create seamless indoor-outdoor transitions, and meet strict U.S. standards for durability, energy efficiency, and weather resistance. With full customization in sizes, finishes, glazing, and configurations, we provide factory-direct solutions that deliver both architectural appeal and long-term value.
Our bifolding doors adopt an innovative folding design, which takes up almost no extra space when opened, allowing you to make full use of every inch of indoor and outdoor space.
The use of high-performance Low-E glass and advanced sealing technology effectively blocks heat transfer, helping you reduce energy consumption and save money.
Equipped with a multi-point locking system and tempered glass to ensure your home is safe and worry-free.
The large glass design with flexible folding function can easily create an open living space, allowing natural light and fresh air to fill the room.
Can be partially or fully opened according to needs, flexibly adjust ventilation and lighting to meet the needs of different weather and occasions.
Provide a variety of materials, colors and hardware accessories to meet different decoration styles and personal preferences, and create your ideal bifold patio doors and windows.
more bifold door design
Interior bifold door
3 panel bifold door
Aluminum bifold door
Bifold sliding doors
Bifold closet door
Bifold patio doors
Bifold Garage Doors
Panoramic Series Aluminum glass Bifold Doors
- Ultra-thin frame design
- High-performance pulley system
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Frame material :
6063-T5 aluminum alloy, thermal break design - Glass: 28mm three-layer Low-E insulating glass
- Wind pressure resistance: 3300Pa
- Maximum opening width: 12 m
4 panel Aluminum Wooden Bifold exterior Doors
- Made of selected hardwood, strictly dried to ensure long-term stability
- High-quality aluminum alloy multi-cavity design, effective insulation
- A variety of natural wood textures and colors are available, and custom paint colors are also available
- Glass: 24mm double-layer Low-E insulating glass
- Sound insulation performance: Rw ≥ 35 dB
- Thermal insulation performance: U value ≤ 1.5 W/(m²·K)
Why Choose Bifold Doors from Grandsea
- Flexible Configurations: Available in 2, 3, 4, or more panels, designed to fold inwards or outwards depending on your space needs.
- Multiple Materials: Choose from aluminum bifold doors, aluminum-clad wood bifold doors, or steel options—each built for different styles and performance requirements.
- Large Openings, Maximum Views: Our accordion-style glass bifold doors can span up to 26 feet (8 meters), perfect for patios, gardens, and terraces.
- Custom Design Options: Select from a wide range of colors, finishes, glass types, and hardware to perfectly match your home’s architecture.
Our doors are not just functional; they are designed to elevate your living space while providing better airflow, natural light, and superior usability compared to sliding or French doors.
Benefits of Our Folding Glass Doors
- ✔ Energy Efficiency – Thermally broken aluminum frames and insulated glass reduce energy bills and maintain comfort in all seasons.
- ✔ Durability & Strength – Built with advanced hardware and strong hinges to ensure smooth operation and long life.
- ✔ Security You Can Trust – Multi-point locking systems across panels for enhanced home protection.
- ✔ Low Threshold Options – Safe, step-free transitions to your balcony, terrace, or garden.
- ✔ Modern Design – Sleek profiles and narrow sightlines maximize your view.
- ✔ Custom Finishes – Available in RAL color coatings, wood-aluminum composites, and premium glass upgrades.
Bifold Doors for Indoor & Outdoor Living
Exterior Bifold Doors
Perfect for patios, decks, and poolside areas—offering wide openings that connect your home to nature.
Interior Bifold Doors
Expand and connect living rooms, bedrooms, or kitchens, creating a sense of openness and luxury.
Commercial Applications
Restaurants, cafes, and retail spaces use bifold doors for versatile layouts and customer-friendly open concepts.
By integrating bifold doors into your project, you can increase property value, enhance comfort, and create an elegant, light-filled space.
High-Quality, Custom-Made Bifold Doors
Every project is unique, and so are our doors. With Grandsea’s USA-based design consultation, you can select the ideal frame (aluminum, steel, or aluminum-clad wood), glass performance (energy-efficient, tinted, laminated), and finishes that fit your home’s style.
Our doors go beyond beauty—they are engineered to meet modern building codes in the United States with a focus on:
- Thermal insulation to prevent energy loss.
- Condensation resistance to avoid mold and structural damage.
- Eco-friendly materials that reduce environmental impact.
Get Your Free Quote Today
Looking to transform your space with custom bifold doors? Whether you’re a homeowner upgrading your patio, an architect specifying doors for a new build, or a contractor working on renovations, Grandsea is your trusted partner.
FAQ'S About bifold doors
How much do bifold doors cost?
The thickness of the glass and the material of the frame are two important variables that affect the bi folding doors price. Our elegant metal double folding doors typically start at about $2,000.
However, remember that the size of the door, the quantity of door panels (or “leaves”) needed, and the color coating of the surface finish will also have an impact on the final cost.
How many sashes can bifold doors have at most?
Glass bifold doors provide spacious openings that turn a terrace or garden into a second living room. The number and width of the sashes are particularly important for the size. In our custom requirements, you can equip the sliding door with up to 7 leafs and a total width of up to 10 meters. You can decide for yourself whether the entire door should be equipped with folding hinges. If required, one wing can also be used as a normal swing door.
How secure are folding patio doors?
Security is particularly important for folding patio doors, as thieves often choose ground-level windows as targets. To increase the protection against theft, you should pay attention to high-quality accessories and suitable security equipment when purchasing. In addition to safety glass, we can also provide higher-grade folding doors locks and hinges according to your requirements.
What are the standard dimensions of bifold windows and doors?
As a custom window and door manufacturer, we produce almost all of them in non-standard dimensions. Simply contact us and let us know the total width and height of your opening, and you will receive a custom window and door made to the millimeter. Unlike other patio doors, the width of the individual leafs of bifold windows and doors cannot be changed, as they all have to be the same size due to the special opening type.
Are folding sliding glass doors airtight?
The folding patio doors we manufacture not only guarantee comfortable operation, but also optimal sealing and thermal insulation. This is ensured by the construction of the running track, in which the individual elements and hinges are guided, so that the door closes absolutely tightly. In addition, all profiles are of course equipped with high-quality seals.
our factory
