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Marvin Replacement Special Shape windows are a perfect choice to add light and style to your home. Built with Ultrex® fiberglass frames, our special shape windows come in various geometric shapes like triangles, rectangles, octagons, and polygons.


  • Picture windows can span up to 10 feet

  • Available in eight geometric shapes in customizable sizes

  • Eye-catching designs

    Line Break

Get your project started by booking a free appointment with one of our design consultants.




Strong Frame Material

Ultrex fiberglass is 8x stronger than vinyl windows to resist warping and shifting to protect your home.


Exceptional Stability

Ultrex expands 87% less than vinyl to resist leaks + seal failures for windows that open and close easily.



Crafted to fit in nearly any space.


Expansive Views

Enjoy up to 56 square feet of viewing with our largest rectangle window.


Contemporary Design

Sharp, diagonal lines create movement and dynamic looks to a contemporary styled home.

Interior view of black bedroom Marvin Replacement special shape windows.

Replacement Special Shape Window Design Options

Replacement Special Shape Window Styles

Mix in modern-styled Marvin Replacement Special Shape windows, made with Ultrex fiberglass, in your home. The sharp angles of the geometric shapes create dynamic looks and unique style for your home.

Our special shape windows come directly glazed, or non-opening, into the frame for a larger viewing area. Design your own custom shape windows by combining special shape windows, like triangles and trapezoids, together for a truly special scenic view.


Special shape windows include octagon, hexagon, pentagon, triangle, polygon, and trapezoid shapes. Assemblies for special shape windows include a two-wide polygon or a three-wide polygon.

Selected: Octagon

Marvin Replacement Octagon Picture Window
Marvin Replacement Hexagon Special Shape Window
Marvin Replacement Pentagon Special Shape Window
Marvin Replacement Rectangle Picture Window
Marvin Replacement Right Triangle Picture Window
Marvin Replacement Equilateral Triangle Picture Window
Marvin Replacement Trapezoid Picture Window
Marvin Replacement Two-Wide Polygon Window
Marvin Replacement Three-Wide Polygon Window
Marvin Replacement Octagon Picture Window

Exterior Colors

Our finish stands up to the elements, so much so that 48,000 hours of sun can't fade our finish* and our fade-resistant acrylic finish resists scratches, chalking, chipping, denting, and peeling. Choose from seven stunning exterior colors to boost your curb appeal.

Selected: Stone White

Stone white swatch
Sierra swatch
Cashmere swatch
Pebble Gray swatch
Bronze swatch
Bahama brown swatch
Ebony swatch
Exterior side of a Marvin Replacement Special Shape window with a Stone White color finish.

Marvin's Ultrex® fiberglass finish is verified to the American Architectural Manufacturers Association (AAMA) 624 specification. Achieving AAMA 624 verification means that our Ultrex finish has passed rigorous tests that simulate the harsh conditions a finish can encounter throughout the life of a window or door.

*Average sunlight exposure per 10 years

Interior Colors

We use the same tough acrylic finish on our four interior color options that we use on our exterior colors. You can also choose our stainable EverWood® finish for the look of wood without the maintenance.

Selected: Stone White

Stone white swatch
Sierra swatch
EverWood finish sample
Bronze swatch
Ebony swatch
Interior side of a Marvin Replacement trapezoid window with a Stone White color finish.

1. Bronze interior is only available with Bronze exterior

2. Ebony interior is only available with Ebony exterior

3. Sierra interior is not available with Ebony exterior

Finish samples are approximate. Schedule a design consultation for an up close view of color options.

Glass Coatings

Our experts will walk you through energy efficient glass options to find the right selection for your home and the best windows for your climate. Choose from four glass coatings, plus decorative glass options, and specialty glass choices.

Low E-1

Primarily used in colder climates, Low E1 allows more heat in to warm a room while blocking heat loss.

Low E-2

Low E2 offers year-round performance in moderate climates. It will help retain heat in your home during the winter and keep heat out during the summer.

Low E-3

Low E3 rejects solar heat while letting light in, resulting in increased performance in climates with intense sun exposure.

Low E-3/ERS

Low E3/ERS provides maximum efficiency year-round in all conditions.

Selected: Low E1

Diagram of Low E glass coating
Diagram of Low E2 glass coating
Diagram of glass with three metallic coatings.
Low E-3 ERS
Diagram of Low E glass coating

Decorative Glass

Decorative glass options are ideal for spaces like bathrooms to balance natural light and privacy.

Selected: Rain

Rain Glass
Glue Chip Glass
Narrow reed glass
Obscure Glass
Frost Glass
Marvin Replacement Reeded Decorative glass
Example of Marvin Replacement Gray Tint Decorative Glass
Sample of Marvin Replacement Green Tint Decorative Glass option.
Example of Marvin Replacement Bronze Tint Decorative Glass.
Rain Glass

Specialty Glass

We offer specialty glass to best suit the needs of your home. You can choose tempered glass, laminated glass, and STC/OITC glass for specific windows and rooms.

Tempered Glass

Tempered glass increases glass strength to help prevent breakage. Tempered glass is ideal for windows close to the floor or located in high-traffic areas.

Laminated Glass

Even more durable than tempered glass, laminated glass is often referred to as impact resistant or safety glass due to its vinyl inter layer that tends to remain in place when shattered.


Sound Transmission Class and Outdoor-Indoor Transmission Class glass has increased pane thickness on the room side and works in areas where exterior noise is a concern.

Divided Lites

We offer various divided lite patterns so you can replicate the look of your original windows and doors. Or, add new architectural interest to your home. Choose from Simulated Divided Lites for classic appeal or Grilles-Between-the-Glass for easy cleaning.

Selected: Grilles Between the Glass

Cutaway of Marvin Replacement Grilles Between the Glass
Cutaway of a Marvin Replacement window with Simulated Divided Lites.
Cutaway of Marvin Replacement Grilles Between the Glass


Since special shape windows are direct glaze windows, there are no maintenance requirements for hardware or weatherstripping. You can clean the glass occasionally, and maintain the interior and exterior surfaces on the same schedule as your other windows.


Learn more about Marvin Replacement Special Shape and Picture windows to see how they can fit into your home's style for expanded views and natural light.

  • Marvin Replacement Picture windows are fixed windows with profiles that look identical to operating windows.

    Special shapes feature narrow frames that can be combined with other windows to add more natural light in your home.

    Marvin Replacement Special Shape and Picture windows are built with Ultrex® fiberglass to pair lasting performance with timeless design.

Frequently Asked Questions

What shapes can windows come in?

Special shape windows can come as triangles, rectangles, pentagons, hexagons, octagons, polygons, and trapezoids.

Where can you put special shape windows?

Special shape windows can fit into various spaces to provide additional natural light to your home. Special shape windows also pair well above single hung, double hung, casement, awning, and slider windows to create bold picture windows. The angles of special shape windows can complement the angles of your home for symmetrical looks.

What kind of windows go with special shape windows?

Special shape windows work particularly well with casement, awning, and slider windows because they can provide seamless uninterrupted views. Triangle windows above flanking double hung windows and a picture window can further illuminate a room and take advantage of vaulted ceiling space.

Special Shape Window Project Transformation

Added Assurance

Marvin Replacement windows and patio doors come with a limited lifetime warranty as well as a 5-year installation warranty to provide additional peace of mind.

Looking for More Replacement Window Information?

Discover additional benefits of Marvin Replacement windows and more for your home.

Marvin Replacement Awning window in a bedroom with hardwood floor

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Learn more about the best windows to improve air circulation in your home.

Windows to Improve Air Circulation
Marvin Replacement window installer places a window

Fiberglass vs. Vinyl Windows

Discover the differences between fiberglass and vinyl windows, and why fiberglass windows have more strength.

Fiberglass vs. Vinyl Windows

Schedule Your Free Consultation

Interior view of an opened Marvin Replacement bi-fold patio door.

If you’re ready to get started, discuss your replacement window and door options with a design consultant. We’re here to answer any questions you may have, and help make your project easy.

Schedule your consultation