Replacement Arch and Round Top Window
Ultrex® Fiberglass exterior and interior
7 Exterior color options
5 Interior colors including EverWood®, our stainable engineered wood grain finish
Arched window design options
Traditional window profile
Our Traditional window profile design features an elegant, curved bevel where the sash meets the glass, offering expansive views and timeless appeal that complements any architectural style.
TriVue™ window profile
Infinity's new TriVue™ window profile features a sleek, modern design that maximizes glass area while maintaining clean, narrow sightlines. This profile incorporates advanced triple-pane glass and offers contemporary aesthetics that complement a variety of architectural styles.
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Traditional profile
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TriVue™ profile
Infinity Round Tops are available in various styles.
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Eyebrow Above Springline
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Eyebrow
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Full Circle
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Half Round Above Springline
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Half Round
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Quarter Eyebrow Above Springline
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Quarter Eyebrow Horizontal
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Quarter Eyebrow
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Quarter Round Above Springline
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Quarter Round
Infinity Round Top windows are available in a variety of assembly options. A window assembly consists of two or more windows mulled (attached) together. A local Infinity expert can talk you through Round Top configuration possibilities.
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Round Top Double Hung Mull
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Half Round Over Casement
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Half Round Over Picture
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Round Top Casement 3-Wide Mull
We offer a variety of exterior colors to suit any home’s style. We use a proprietary acrylic finish on our Ultrex® fiberglass that’s virtually impermeable to help protect your investment from wind, weather, and color fading.
* Finish samples are approximate. Please schedule an in-home consultation or visit a showroom to see actual color samples.
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Stone White
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Sierra
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Cashmere
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Pebble Gray
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Bronze
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Bahama Brown
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Ebony
We use the same acrylic finish on our interior as on our exterior for superior performance. Or choose EverWood®, our stainable engineered wood grain finish, to blend seamlessly with your existing décor. All offer virtually no maintenance — just remarkably reliable performance.
* Bronze interior is only available with Bronze exterior.
* Ebony interior is only available with Ebony exterior.
* Sierra interior is not available with Ebony exterior.
* Finish samples are approximate. Please schedule an in-home consultation or visit a showroom to see actual color samples.
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Stone White
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Sierra
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EverWood
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Bronze
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Ebony
Energy-efficient glass options
Double-pane windows
Infinity's standard double-pane glass consists of two layers of glass with an insulating air space between them, providing enhanced thermal efficiency. Double-pane glass is exclusively available with the Traditional window profile.
Triple-pane windows
Triple-pane glass is exclusively available with the TriVue™ window profile and features three layers of glass separated by insulating air spaces, compared to the two layers found in standard double-pane windows. Triple-pane windows are the most energy-efficient window option.
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Traditional window profile with double-pane glass
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TriVue™ window profile with triple-pane glass
Decorative glass
Ideal for the space that calls for natural sunlight indoors, decorative glass allows you to create the perfect combination of style and privacy in your new Infinity replacement windows and doors. Make a beautiful statement by choosing one of Infinity's decorative glass options.1
Specialty glass
Tempered
Increases glass strength to help prevent breakage. This option is ideal for windows and doors that are close to the floor or located in high-traffic areas.
Laminated
Even more durable than tempered glass, laminated glass is often referred to as impact resistant or safety glass due to its vinyl interlayer that tends to remain in place when cracked.
STC/OITC
Sound Transmission Class and Outdoor-Indoor Transmission Class Glass has increased pane thickness, ideal in areas where exterior noise is a concern.
California Fire Glass
A dual pane option where one pane is made of regular or annealed glass and the other pane is made from tempered glass, meeting California fire zone code. Infinity windows are not fire-rated.2
1. Obscure glass is the only decorative glass option available with TriVue™ window profile.
2. California fire glass is not available with the TriVue window profile.
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Obscure
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Rain
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Glue Chip
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Narrow Reed
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Reed
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Frost
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Gray Tint
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Green Tint
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Bronze Tint
Low-E glass glazing options
Low E1
An option for colder climates — especially those at elevations with direct sun exposure. A single layer of coating allows UV rays to warm your home while blocking heat loss.
Low E2
Low E2 features two layers of coating that reflect heat back to the source. This glass performs year-round in moderate climates, retaining heat in the winter and keeping it out in summer.
Low E3
With three layers of coating, Low E3 keeps solar heat at bay while letting visible sunlight into your home. A popular option for climates with intense sun exposure.
Low ERS
Available in conjunction with Low E2 or Low E3, this additional layer of coating is added to the room side of the glass. Low ERS reflects heat back into the room for maximum year-round energy efficiency.
Simulated Divided Lites
Our Simulated Divided Lites (SDLs) are built with Ultrex® fiberglass and permanently adhered in our factory to the outside surfaces of the glass. SDLs have a spacer bar between the panes of glass to offer the traditional look of divided lites.1
Grilles Between the Glass
Grille bars are located between the panes of insulating glass. Grilles Between the Glass (GBGs) combine easy cleaning with the timeless detail of a grille pattern.
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Simulated Divided Lites
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Grilles Between the Glass
Patterns
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. Ask your local Infinity partner about additional patterns and style options.
1. With the TriVue™ window profile, SDLs are only available for special shape and round top windows.
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Circle Dual Hub 6 Spokes
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Equal Rectangular
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Half Round Above Springline Dual Hub 3 Spokes
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Half Round Above Springline Open Hub 3 Spokes
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Half Round Solid Hub 3 Spokes
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Quarter Round Open Hub
Build your own replacement arch and round top window
Engineered to outperform
Infinity by Marvin Built for life®
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The power of Ultrex® fiberglass
Made with 100% fiberglass, Ultrex protects the integrity of your home with superior bend and flex resistance.
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Backed by an incredible warranty
We proudly offer a Limited Lifetime Warranty to give you peace of mind. It's our pledge to you that we will stand behind our products for as long as you own your home.
How round top windows work
Explore Infinity's replacement fiberglass window collection
Browse Infinity's window replacement products and learn how Infinity fiberglass windows offer durability, style, and strong performance.
Frequently Asked Questions
Round top and arched windows can be used interchangeably to describe windows with a curve at the top. They’re inoperable windows and get installed above casement, double hung, single hung windows.
Arch and round top windows can get installed above several types of windows. Common assemblies include installing arch and round top windows above double hung and single hung windows, casement windows, and picture windows.
Round top and arch windows remain inoperable because they get direct glazed into the frame.
A Palladian window is large window with an arched window in the middle, flanked by two narrow rectangle windows. The windows take their name from 16th century architect Andrea Palladio, who included symmetry and proportional style.
To measure an arch window for replacement you need to measure the width of the window at its base. Measure from the inside corner at one end of the base to the other corner of the base. Then you want to measure the tallest point of the window for the height. Sometimes people will want a perfect arch window. That means the height of the arch is exactly half the width of the base width.
No, arched windows are not outdated. They continue to appear in homes as a great way to add natural light and curb appeal. Arched windows have timeless character despite their prominence in older homes. Arch windows fit well in contemporary homes above entry doors to enhance a foyer to give it a warm, welcoming feel.
Arch window prices depend on several factors. The size of the window, installation needs, and design options affect arched window costs. An Infinity by Marvin expert can review details with you to provide arch window prices.
Circular windows can have several names. They are also known as circle windows, full-circle windows, or porthole windows. Sometimes curved windows are considered circular windows, but most curved windows are known as round top or arch windows. Circular windows are also called rose windows, but rose windows refer specifically to ornate circular windows found in historic churches. Circular windows are fixed windows, meaning they do not open and close. Circle windows fit both contemporary and traditional style homes.
Get inspired
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