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Bi-fold doors, also called folding patio doors, are ideal for expanding and connecting indoor and outdoor spaces.

  • Bi-parting and unidirectional configurations available
  • Multi-point locking system on primary panel, dual point lock on others 
  • Available in widths over 3' and heights up to 10'
  • Nine colors and wood grain finishes plus custom colors
  • Several hardware styles, colors, and finishes to choose from


Our low-maintenance interior and exterior finishes resist fading, peeling, and chalking even under the most extreme coastal conditions. Finish options include five colored finishes and five wood grain finishes that will bring beauty and natural warmth to your home. 

Our Bronze, Black, Bronze, and Stone White Kynar finishes are AAMA 2605 certified. AAMA 2605 is the American Architectural Manufacturer's Association's high-performance exterior specification. Finishes meeting this certification exhibit outstanding resistance to humidity, color change, chalk, gloss loss, and chemicals. 

We also offer custom color options to create your unique, coastal window and door vision. 

Schedule an Appointment

We will follow up with you to find a date and time that works for you. Thank you!

What to Expect

When we meet with you, we will:
- Evaluate your existing windows & doors
- Listen to what you're looking for
- Present options for your project
- Provide a quote

Appointments typically take about an hour.


See the Bi-Fold Door in Action

Marvin Coastline Bi-Fold doors allow you to move between indoor and door spaces seamlessly.

Benefits of Hurricane Impact Bi-Fold Doors

Exterior of building featuring Marvin Coastline hurricane rated bi-fold doors

Beauty & Aesthetics

Available in dramatically large sizes for expansive views, the Coastline Bi-Fold patio door takes advantage of Florida's breathtaking scenery and abundant sunshine. Reimagine the way you live and transform your home by combining up to 10 door panels that fold open and close to create massive openings. Our Bi-Fold door makes for seamless indoor-outdoor living spaces you can enjoy all year.

Exterior of a commercial building featuring Marvin Coastline hurricane rated bifold doors

Protect & Perform

To withstand the extreme winds and flying debris, our hurricane bi-fold patio doors are built with strong, extruded aluminum frames and impact glass that provide superior protection. The finishes and hardware on a Coastline Bi-Fold door are engineered to resist corrosion and fading from the intense UV rays. Coastline Bi-fold doors offer effortless operation and a multi-point locking system for added safety.

Interior of a home featuring Marvin Coastline hurricane rated bifold doors

Noise Reduction

Compared to standard doors, the laminated, impact-resistant glass in a Coastline Bi-Fold door is effective at suppressing unwanted outside noise from neighbors, construction, thunder and street traffic. The insulation gained by installing an impact bi-fold patio door can help to reduce the amount of noise pollution in your home, making it a more quiet and peaceful space.

SIW Impact Windows & Doors Reviews

What Our Customers Have To Say

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I would highly recommend SIW for your impact door or window needs. We had 2 doors installed by them and the doors are beautiful!! The installers were always on time and very courteous! They went above and beyond to make sure we were happy with the final product!

Christopher S.

Great company. Excellent product. The installers did a phenomenal job. Very happy with the service!

Maikel I.

We had 24 windows, four sliders, and two doors all installed at the same time. Flawless, and as smooth as could be. The quality of the windows and doors is great. Cannot say enough positive things about the entire experience, from start to finish.

Barry M.

Delray Beach