What are shaped (architectural) windows?

Shaped windows are fixed, non-operable specialty windows manufactured in distinctive forms—such as round, half-round, quarter-round, triangular, cathedral, eyebrow, and octagon. They’re used to add architectural character, increase natural light, and frame views.

Do shaped windows open for ventilation?

No. Shaped windows are fixed in place and do not open. For airflow, they’re commonly paired with operable styles nearby—such as casement, awning, or double-hung windows.

Which shaped window styles do you install?

Popular options include round (circle), half-round (half-moon), quarter-round, triangular, cathedral (pointed arch), arched/eyebrow, and octagon shapes. Custom shapes and sizes are available to match your home’s design.

What brands or product lines are available?

We install ProVia® shaped windows across multiple lines to fit different budgets and aesthetics, including Endure, Aeris, Aspect, and EcoLite.

Are shaped windows energy efficient if they don’t open?

Yes. Although they’re fixed, ProVia shaped windows are engineered with insulated frames and advanced glazing to help reduce heat transfer. ProVia’s Endure series is ENERGY STAR® certified and recognized for high efficiency.

Where in the home do shaped windows work best?

They’re frequently used as accents in entryways, living rooms, dining rooms, stairwells, vaulted ceilings, lofts, bathrooms, and over doors or larger picture windows to create a focal point and bring in natural light.

Can I customize colors, finishes, and glass?

Yes. Choose from a variety of exterior colors, interior wood-look stains or paints (product-line dependent), grid patterns, and decorative, stained, privacy, or tinted glass to align with your home’s architecture.

Can shaped windows be combined with other window types?

Absolutely. It’s common to pair a shaped window above or beside standard rectangular windows or doors. Many homeowners combine shaped windows with picture, casement, awning, or double-hung windows for both style and ventilation.

Are shaped windows a good fit for St. Louis homes?

Yes. In the St. Louis climate, shaped windows add curb appeal and daylight while energy-efficient construction helps keep interiors comfortable year-round when properly specified and installed.

How do I get a quote for shaped window installation in St. Louis?

Request a free estimate from STL Windows & Doors. We’ll help you choose the right shape, size, ProVia product line, and customization options for your home.

Architectural & Shaped Windows in St. Louis

Looking to add a unique architectural touch to your home? STL Windows & Doors is proud to offer shaped window installation for St. Louis homeowners who want to make a statement with style, natural light, and lasting performance.

We specialize in custom-shaped windows crafted by ProVia, designed to enhance both classic and contemporary homes. With options like round, half-moon, triangular, octagon, and more, shaped windows allow you to highlight special spaces and bring character to your home’s design.

Unlike standard window styles, shaped windows are fixed in place. This makes them an excellent choice for increasing energy efficiency, framing distinctive views, and adding elegance to entryways, living rooms, stairwells, and vaulted ceilings.

Whether you want to showcase a grand feature window or add a decorative accent, we have the expertise to help you choose the perfect shape for your home.

Ready to elevate your home’s curb appeal with shaped windows? Request your free quote today.

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Aeris Sandstone Double Hung and Shaped Window

Shaped Window Brands

We proudly install ProVia shaped windows that bring distinctive style and timeless character to your home. While shaped windows are a fixed-style option, they can be paired with other window types, such as casement, awning, or double-hung windows, for added ventilation and design flexibility. For homeowners considering large fixed-glass options, our Picture Window Replacement Guide: Everything You Need to Know offers helpful insights into design, performance, and installation.

Every shaped window we install is fully customizable to suit your home’s architecture and personal style. Choose from a variety of frame colors, interior grid patterns, decorative or stained glass, and even privacy or tinted glass to create a window that enhances both form and function.

ProVia offers four exceptional product lines to ensure you get the right balance of beauty, performance, and value for your home:

Endure

Aeris

Aspect

EcoLite

With ProVia, you can achieve a shaped window design that complements your home’s architecture while meeting your performance and budget goals.

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Available Window Shapes

Shaped windows offer a creative way to add architectural interest and personality to a home. From bold geometric lines to graceful curves, these specialty windows highlight unique design elements, bring in natural light, and complement other window styles for a truly custom look.

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Benefits: Provide a striking focal point and soften straight architectural lines.
Use Cases: Commonly found in bathrooms, attics, or entryways as an accent window.
Use With: Often paired with rectangular or square windows to balance the design.

Benefits: Add elegance with a subtle curve that enhances natural light.
Use Cases: Typically installed above entry doors, patio doors, or large living room windows.
Use With: Almost always combined with standard rectangular windows or doors.

Benefits: Compact and stylish, these windows bring in light while fitting neatly into corners or archways. Their curved shape softens architectural edges and adds a touch of elegance without overwhelming the space.
Use Cases: Often found above doors, in transoms, or tucked into small wall spaces like stairwells and entryways.
Use With: Typically paired with rectangular windows, doors, or other half-round windows to complete a design.

Benefits: Triangle windows are bold and modern, great for following rooflines or gables.
Use Cases: Often placed in lofts, A-frame homes, or contemporary living spaces.
Use With: Typically used alongside large picture windows or floor-to-ceiling designs.

Benefits: Create grandeur and maximize light with tall, pointed arches.
Use Cases: Frequently featured in great rooms and entryways with vaulted ceilings.
Use With: Commonly combined with large picture windows for dramatic effect.

Benefits: Add elegance with a subtle, soft arch that breaks up straight rooflines and window groupings.
Use Cases: Often installed above doors, double-hung, or picture windows. Common in entryways, dining rooms, and living rooms for added architectural interest.
Use With: Frequently paired with rectangular windows or picture windows. Also complements larger assemblies like bay or bow windows for an upscale finish.

Benefits: Add sophistication with soft curves that break up straight lines.
Use Cases: Used in living rooms, dining rooms, or over doors for elegance.
Use With: Typically installed above double-hung or picture windows.

Benefits: Provide a longer, sweeping arch that spans multiple windows or doors for a dramatic effect. Lets in abundant natural light while maintaining a distinctive design aesthetic.
Use Cases: Typically placed next to groups of windows or sets of patio doors. Popular in great rooms, sunrooms, and large open spaces with high ceilings.
Use With: Best paired with double-hung windows, casements, or patio doors. Also works well in combination with large picture windows.

Benefits: Unique geometric shape adds charm and visual appeal.
Use Cases: Common in bathrooms, hallways, or stairwells as decorative accents.
Use With: Usually stand-alone but can complement other specialty shapes.

Benefits: Provide a bold, angular look that aligns with contemporary or geometric home designs. Create visual interest by breaking away from standard shapes.
Use Cases: Often placed in gable ends, lofts, or upper wall spaces. Suitable for A-frame cabins or houses with unique architectural styles.
Use With: Frequently combined with triangular windows or picture windows. Complements angled rooflines and geometric layouts.

Benefits: Bring modern flair with clean, angular lines that echo roof pitches and vaulted ceilings. Maximize daylight in upper wall spaces where standard windows won’t fit.
Use Cases: Common in vaulted living rooms, lofts, and sunrooms. Frequently installed under rooflines or alongside large cathedral windows.
Use With: Often paired with picture windows below for expansive views. Also works well with other specialty windows to create custom wall designs.

Shaped Window Colors and Finishes

Selecting the right color and finish is just as important as choosing the perfect window shape. With STL Windows & Doors, you can personalize your shaped windows to match your home’s architecture and interior design. Whether you prefer a crisp painted frame or the warmth of a natural woodgrain interior, ProVia offers a wide range of options to complement your unique style.

Color and finish availability will vary based on the ProVia window line you select — Aeris™, Endure™, Aspect™, or Ecolite™— but every option is designed to combine lasting performance with timeless beauty. With so many choices, it’s easy to create a shaped window that not only stands out but also blends seamlessly into your home’s overall look.

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Snow Mist
Cafe Cream
Primrose Yellow
Chateau
Sandpiper Beige
Sandstone
Sterling Gray
Clay
Vallis Red
Mountain Berry
Rustic Bronze
Tudor Brown
Geneva Blue
Enzian Blue
Forest Green
Coal Black
Classic Bronze
Nightfall (new 2020)

Oak Wood Species

Honey Wheat
Caramel
Truffle
Ginger
Almond
Pecan
Espresso

Cherry Wood Species

Toffee
American Cherry
Chestnut
Cinnamon
Nutmeg
Hazelnut
Coffee Bean

Maple Wood Species

Natural
Fruitwood

White
Beige
Sandstone

Brookhaven
Beige
Mirage

WINDOW SHAPES BY BRAND

Use the chart below to compare available window shape options across each ProVia® series. Whether you’re interested in bold architectural details or subtle curves, this table makes it easy to find which specialty styles, like circles, arches, or triangles, are offered by AERIS™, ENDURE™, ASPECT™, and ECOLITE™ windows.

Window Shape	AERIS™	ENDURE™	ASPECT™	ECOLITE™
Circle Top XL (arch window)	✔️	✔️	✔️	✔️
Full Circle (round window)	✔️	✔️	✔️
Octagon	✔️	✔️	✔️
Full Eyebrow (eyebrow window)	✔️	✔️	✔️	✔️
Full Eyebrow XL (extended eyebrow)	✔️	✔️	✔️	✔️
Circle Top (half-round window)	✔️	✔️	✔️	✔️
Single Hung with Circle Top (single hung half-round window)		✔️	✔️	✔️
Quarter Circle (quarter round window)	✔️	✔️	✔️	✔️
Pentagon	✔️		✔️
Trapezoid	✔️	✔️	✔️
Triangle	✔️	✔️	✔️
Gothic (cathedral window)	✔️	✔️	✔️

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WINDOW GALLERY

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PROVIA Windows OFFER STUNNING ENERGY EFFICIENCY

When it comes to combining unique style with performance, ProVia shaped windows set the standard. Known for their exceptional craftsmanship, these windows are engineered with the same advanced technology and energy-saving features as ProVia’s most popular window lines.

Although shaped windows are fixed in place, they’re designed with insulated frames, precision construction, and advanced glazing to reduce heat transfer and keep your home comfortable year-round.

ProVia’s Endure™ series is ENERGY STAR® certified and was recognized as one of 2024’s Most Efficient windows—meeting strict EPA standards for lowering energy use and reducing utility bills.

With ProVia shaped windows, you don’t have to choose between architectural beauty and energy efficiency—you get both, along with the peace of mind that comes from one of the most trusted names in the window industry.

WHAT CUSTOMERS SAY

      EXCELLENT  
   Based on 199 reviews 
    
 
 
 
   
 
 
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   Jeff Gordon 
 
 
 
 Trustindex verifies that the original source of the review is Google. Peyton and Max installed 21 new windows and a new front door. They were a pleasure to work with, especially since we had other home improvement projects going at the same time. They did meticulous work and answered all of our questions.
  
 
     Posted on Google  
   
   Mike Kelly 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had a great experience with STL Windows and Doors. They we're booked up initially, but they still were able to setup an appointment and put me on the schedule.

This company has great prompt customer service, fair pricing, and great professionalism. I would highly recommend their service.
  
 
     Posted on Google  
   
   Anne Croy 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent service with initial sale and installation!!  High quality product.
  
 
     Posted on Google  
   
   Vivian Saied 
 
 
 
 Trustindex verifies that the original source of the review is Google. I used Stl windows and doors to replace half of the windows in my house and a sliding door. The whole process was excellent. From talking with Dan, the sale manager to the installers (Tony and his crew ) to Scheduling with Chris at the office. First of all, Chris was able to up my schedule date a week early upon my request. I'm sure he squeezed me in his tight schedule. I was very thankful. Tony and his crew were very professional, yet  friendly and considerate. They were prompt on time the 3 days they came and very efficient. They took down my window treatments and put them back up again exactly the way they were. They moved furniture and put back.  They took the time to explain how the windows opened from top to bottom as the windows had many options that my old windows didn't have. I would use them again and would definitely recommend them to my family and friends
  
 
     Posted on Google  
   
   Elizabeth Purcell 
 
 
 
 Trustindex verifies that the original source of the review is Google. Worth the wait! Price was insanely different from other bids for a single window replacement. Paid cash for a slightly better rate. Originally was going to need to wait 8 months for replacement but I got lucky & they fit me in at the 4 month marker since they had a cancellation.  Customer service from Kaleb & Tony was outstanding.  Both were very personable & made me feel confident that the job was being done well.  Great warranty! Glad to check this off my list:)
  
 
     Posted on Google  
   
   Aaron Fox 
 
 
 
 Trustindex verifies that the original source of the review is Google. STL Windows and Doors did an excellent job with our window replacement project. We live in an older home (over 100 years old) and we know there are going to be issues related to its age. The STL Windows and Doors team worked extremely hard with us to replace one of our bathroom windows that had begun to show signs of water damage. After the initial window replacement project was finished, we did communicate with their team about concerns we had with the original window frame that remained. Chelsea worked with us and a team (Tony and Caleb) came to our house within a week and replaced the frame as well. Their prices were reasonable and they had an array of choices. Overall, we highly recommend them for any window-related project you may have!
  
 
     Posted on Google  
   
   Jake Bloomer 
 
 
 
 Trustindex verifies that the original source of the review is Google. Experience was great, STL W+D replaced our old rear door and transom with a new eight-foot unit. It’s great to have this huge pane of glass looking out over the back yard. Installers were great and clean and shimmied the door in without removing our old casing and messing with the plaster. They know what they are doing!
  
 
     Posted on Google  
   
   Randall H 
 
 
 
 Trustindex verifies that the original source of the review is Google. The removal of the old window and the installation of the new window went more smoothly than I would have expected. Peyton and Max were knowledgeable, professional, and completed the installation beautifully and efficiently. Both of them did a great job with making in the new window secure, sealed, and attractive.
  
 
     Posted on Google  
   
   T Baker 
 
 
 
 Trustindex verifies that the original source of the review is Google. Premium products and service at a more affordable price. Fantastic experience at every step of the process. Had some hail and tornado damage. Jared (sales) was friendly and knowledgeable about the industry. Did not hard sell, but instead provided a balanced and very detailed explanation of STL's products and services vs competitors, which felt trustworthy. Dan (owner) came out to measure the windows. My spouse said he was friendly and answered her questions. We got an unexpected scheduling break and installed much sooner than the expected wait. The installers, Peyton and Max, were friendly, efficient, and conscientious of our home. Their finish work (sealing and caulking) is better than the original for the house. They took the time to demonstrate all the features of the new windows and how to care for them. We all noticed a defect in the glazing inside one of the window sashes, which they immediately reported to the owner who, in turn, called me immediately about the manufacturer's quick replacement. Provia warrantees the vinyl, glass, hardware and screen of the window for life and this guarantee is transferable once to a new home owner. The installation has a 10-year guarantee. Also, STL has another business for window cleaning and screen replacement, which we're going to check out.
  
 
     Posted on Google  
   
   Jessica Klemp 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great company to work with! We needed four hopper windows replaced on our garage/basement and STL Windows and Doors provided the best service and most competitive pricing. The work was done quickly and professionally, and everyone we met from the company was friendly. We would recommend calling them for your window needs!

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Why Homeowners Love Shaped Windows

A shaped window in St. Louis offers more than just a decorative accent, it transforms your home with added character, natural light, and long-lasting value. With their custom designs and fixed-frame construction, shaped windows are perfect for homeowners who want to highlight architectural details and create a one-of-a-kind look.

Here are five reasons St. Louis homeowners choose shaped windows:

Shaped windows add instant curb appeal by breaking away from traditional rectangular designs. Whether it’s a graceful arch, a bold triangle, or a classic round window, these custom shapes create a distinctive look that elevates your home’s exterior and interior design and pair really well with picture windows.

Their fixed-glass design allows natural light to stream into living rooms, stairwells, entryways, and vaulted ceilings, anywhere you want to brighten the space. Shaped windows are ideal for enhancing rooms that need a touch of light and openness.

Like all ProVia windows, shaped windows are crafted with insulated frames and advanced glazing to minimize heat transfer. That means year-round comfort, lower energy bills, and outstanding performance through hot summers and cold winters.

Because of their unique design and energy-efficient construction, shaped windows increase both aesthetic appeal and resale value. Prospective buyers love the combination of eye-catching style and practical benefits these windows bring.

With no moving parts, shaped windows are simple to maintain and built to last. Their strong, weather-resistant frames ensure they remain beautiful and functional with minimal upkeep for years to come and make useful windows for dormer window replacement.

WHY CHOOSE STL WINDOWS & DOORS?

STL Windows & Doors is the trusted choice for homeowners across the St. Louis metro area who want replacement windows in a variety of shapes, installed with precision and care. We specialize in ProVia’s full line of specialty shapes and are dedicated to delivering superior craftsmanship, reliable service, and long-term value that truly sets us apart.

From your first consultation to the final walk-through, our team provides exceptional customer care at every step. Each shaped window is carefully measured, installed, and sealed to perfection—so your unique design looks beautiful and performs flawlessly for years to come.

STL Windows and Doors Team Installing Windows

Shaped windows require expert attention to detail, from framing and leveling to ensuring a tight, energy-efficient seal. Our factory-trained, certified installers use advanced tools and techniques to guarantee every custom window fits exactly as it should—maximizing beauty, durability, and performance.

Whether you’re adding a decorative accent to an existing home or incorporating shaped windows into a new build, STL Windows & Doors makes the process simple, stress-free, and successful. As a ProVia Platinum Dealer and Certified Installer, we deliver quality and peace of mind that you can count on.

We're a ProVia Platinum Dealer and Certified Installer

As a ProVia Platinum Dealer, STL Windows & Doors installs only the highest-quality products, crafted for durability, beauty, and long-term performance.

ProVia shaped windows are custom-built to order using advanced materials that resist warping, fading, and moisture intrusion. This makes them a smart, lasting investment for homeowners across the St. Louis area.

Each new window is engineered with heavy-duty frames and performance glass packages that meet or exceed ENERGY STAR® standards, ensuring year-round efficiency and comfort without compromising on style.

As a trusted window replacement company serving the St. Louis metro, we make quality installation services our top priority. Every picture window project is a reflection of our dedication to precision, performance, and professionalism.

Your satisfaction isn’t just a goal, it’s a guarantee. That’s why we back every installation with a 10-year workmanship warranty, giving you long-term peace of mind and confidence in your investment.

FAQs About Shaped Windows

Below are some of the most frequently asked questions we receive from homeowners. If you don’t see your question here, please don’t hesitate to reach out.

An arched window is often referred to as a round-top window, full eyebrow window, or radius window. Each term describes the curved top design that sets these windows apart.

Yes. Arched windows are considered a premium feature that adds timeless style, boosts curb appeal, and enhances interior spaces, all of which can increase a home’s resale value.

No. Half moon (or half-round) windows remain a popular choice. They’re timeless accents often installed above doors or larger windows, bringing elegance and natural light into entryways and living rooms.

With professional installation and quality materials like ProVia’s, shaped windows typically last 20–30 years or more. Because they’re fixed (non-operable), they require less maintenance and enjoy longer lifespans than other window types.

The cost depends on size, shape, and customization. Since curved windows are specialty products, they usually cost more than standard rectangular styles. We offer free quotes so you can get accurate pricing for your project.

Round windows may also be called circular windows, porthole windows, or bullseye windows. These distinctive windows are often used in bathrooms, stairwells, or gables for a unique design touch.

Arched windows require specialized installation to ensure proper framing, sealing, and fit. That’s why it’s important to choose an experienced installer like STL Windows & Doors, a ProVia Platinum Dealer and Certified Installer.

Cathedral windows are tall, pointed, and often installed in rooms with vaulted ceilings. Their dramatic design draws the eye upward, creating a sense of height, openness, and architectural grandeur.

Most triangular windows are fixed for strength and energy efficiency. However, they can be paired with operable styles, such as casements or awnings, to provide ventilation while maintaining their distinctive look.

Architectural & Shaped Windows in St. Louis

Shaped Window Brands

Endure

Aeris

Aspect

EcoLite

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Available Window Shapes

Round Windows or Circle Windows

Half Round of Half Moon Windows

Quarter Round of Half Moon Windows

Triangular Windows

Cathedral Windows

Eyebrow Windows

Arched or Full Eyebrow Windows

Extended Eyebrow Windows

Octagon Windows

Pentagon Windows

Trapezoid Windows

Shaped Window Colors and Finishes

EXTERIOR COLORS

INTERIOR STAIN FINISHES

INTERIOR PAINT FINISHES

(new) Decorative Glass Designs

WINDOW SHAPES BY BRAND

WINDOW GALLERY

PROVIA Windows OFFER STUNNING ENERGY EFFICIENCY

WHAT CUSTOMERS SAY

Why Homeowners Love Shaped Windows

Unique Architectural Style

Brighter, More Inviting Spaces

Energy Efficiency Built for St. Louis Homes

Enhanced Home Value

Low Maintenance & Long-Term Durability

WHY CHOOSE STL WINDOWS & DOORS?

Expert Installation Services You Can Rely On

Quality Products That Last

Satisfaction Guaranteed

FAQs About Shaped Windows

What is an arched window called?

Do arched windows increase home value?

Are half moon windows outdated?

How long does a Shaped window last?

How much do curved windows cost?

What are round windows called?

Are arch windows difficult to install?

What makes cathedral windows so unique?

Can triangular windows open?

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