STL Windows & Doors is a platinum dealer and certified installer of Provia Casement Windows, renowned for its exceptional energy efficiency. These windows, including both casement and awning styles, are designed for optimal airflow and functionality.

Their unique hinge placement and single-sash design make them perfect for hard-to-reach areas like over sinks or cabinets. Casement windows allow for full top-to-bottom ventilation, while awning windows let in fresh air with added protection from the rain.

ProVia Awning & Casement Windows


Our customers love us for many reasons.

ProVia The Professional Way


Combine awning and casement windows to craft a stunning wall, or mix them with different window styles for a unique look. Explore various customization choices to enhance your home’s exterior charm, including window hues, ornamental or stained glass, privacy options, tinted panes, and internal grilles. We offer awning and casement windows in these fine brands.


Excellent mid-range window offering high energy efficiency and sturdy construction.

provia aspect casement window


Superior vinyl window paired with a wood-clad interior

Provia awning window aeris2


provia awning window endure2
Stunning energy efficiency with the most options for colors & glass.

WINDOW Configurations

ProVia’s awning & casement windows come in these configurations.


ProVia Awning Window 1-Lite

2 Lite (1/2-1/2)

2-Lite (1/3-2/3)

2 Lite (1/4-3/4)

1-Lite Right

1-Lite Left

1-Left Fixed

2 Lite (1/2-1/2)

3 Lite (1/3-1/3-1/3)

ProVia Casement Window 3-Lite (1/3-1/3-1/3)

3 Lite (1/4-1/2-1/4)

ProVia Casement Window 3-Lite (1/4-1/2-1/4)


Endure | Aeris | Aspect


You can customize these windows, from window trim to glass treatment and hardware color. Here’s a sample of our casement replacement window colors and finishes.  We’ll surely bring plenty of product samples to your home in St. Louis.

Oak Wood Species

Cherry Wood Species

Maple Wood Species



FEATURES & Benefits

Explore the standout features and benefits of ProVia awning & casement windows, designed to elevate your home with reduced energy costs, enhanced security, effortless maintenance, and superior sound reduction.

  • Each window sash fits perfectly into the frame, with triple weatherstripping significantly reducing air leakage while improving your home’s insulation.
  • These windows significantly minimize heat transfer thanks to Low-E glass technology and argon gas fill. They are ENERGY STAR certified, indicating they adhere to the rigorous energy efficiency standards set by the U.S. Environmental Protection Agency. 
  • This keeps your home cool in the hot months and cozy when it’s cold, all while easing the workload on your HVAC system. Each window sash fits perfectly into the frame, with weatherstripping that seals tight and stops air from sneaking through cracks. 
  • These windows have a durable multi-point locking system engineered to ward off unauthorized entry, giving you a sense of security. The frames are sturdy and fortified to offer additional defense against break-ins.
  • Their build includes a polyurethane core and composite endcaps that boost energy efficiency and increase the window’s strength – doubling up as a protective feature.
  • An efficient crank mechanism makes for effortless operation while ensuring that the window sash locks firmly, reducing weak spots when shut tight. With their single-hinged sashes, these casement windows deliver convenience and solid safety features to counteract potential intruders’ attempts.
  • The smart design ensures that keeping your windows clean and well-maintained is a breeze.
  • With a simple crank mechanism, these windows open wide so you can reach both sides from the comfort of indoors—no ladder needed for those hard-to-reach outdoor surfaces, especially helpful for anyone in a multi-level home.
  • The vinyl material used in these windows is strong against weathering without peeling or losing color, which keeps them looking like new year after year. 
  • Discover the peace a quieter home can offer with Provia Awning & Casement Windows and its sound reduction technology.
  • They are crafted to muffle noise from outside, whether busy streets or buzzing lawnmowers, turning your living area into a tranquil haven.
  • Embrace stillness with Endure windows, noted for their superior external noise reduction capabilities.


Provia, recognized as 2024’s Most Efficient Energy Star® certified for windows, promises high energy efficiency by meeting strict EPA standards, reducing homeowners’ heating and cooling costs.

Energy Star Most Efficient 2024 Award
  • These windows offer exceptional insulation with features like Low-E glass technology and argon gas fill, enhancing comfort in the home while lowering energy expenditure.
  • Provia casement windows improve home security with robust multi-point locking systems and durable materials that withstand adverse weather conditions.
  • Homeowners have various customization options, including different types of glass, frame materials, colors, and hardware finishes to suit any architectural style or personal preference.
  • STL Windows & Doors guarantees expert installation services for these top-quality windows, strong warranties, and a commitment to customer satisfaction.


We’re your trusted source and pride ourselves on being the go-to experts for high-quality Provia casement window installation, embodying a commitment to excellence that homeowners trust. Our dedicated team brings unparalleled skill, ensuring every project meets our stringent standards for installation quality.

We strive to create an excellent experience from beginning to end. High ratings and minimal complaints about Provia’s windows show that customers are at the core of everything we do. Homeowners can rely on our professional services and feel secure in their choice — because ensuring your peace of mind is part of what we promise.

STL Windows and Doors Team Installing Windows

Expert installation services

Upgrading to stylish casement windows can transform your space, whether a new build or a renovation project. Professional installation comes with more than just the promise of energy savings; it guarantees top-notch quality, guaranteeing that each window is a perfect fit and operates smoothly.

Our experienced installers precisely measure and employ state-of-the-art tools to ensure your windows are installed accurately.

We're a ProVia Platinum Dealer and Certified Installer


These windows are not just long-lasting; they incorporate advanced weather stripping and multi-point locking systems designed for your peace of mind. Their robust vinyl frames resist warping, chipping, or peeling, maintaining a pristine appearance.

Customization meets quality as ProVia windows are made to order for each homeowner’s unique taste and home’s architecture. Whether you’re looking for that modern feel or matching old-world charm with muntins across the glass, you can be sure that these products can blend seamlessly with any new construction or renovation project.

10-Year Workmanship Warranty


Quality installation is our top priority; it shines through every Provia casement window installation. Our promise to you is complete satisfaction with your new windows.

We stand behind our work and products by offering strong 10-year workmanship warranties that guarantee long-lasting performance and enjoyment in your home.

If any issues arise, we provide a simple online process for homeowners to register their warranty or report any product concerns, showing how much we value customer service.


Here are some frequently asked questions about these windows.  If you have other questions, please get in touch with us!

Casement windows are operated by turning a handle, which moves the window on its hinges, allowing it to swing open or close.

  • When the handle is turned, a metal arm mechanism, often called an operator, pushes the bottom of the sash outward while pulling the top inward.
  • The casement stay, a type of bar or metal arm attached to the bottom of the window, holds it in place when it’s fully open to prevent it from slamming shut due to wind.
  • For added security and weatherproofing, a multi – point locking system is engaged by a single lever; this draws the sash tightly against the frame’s sealing gasket.
  • High – quality weather stripping encircles the window’s perimeter ensuring that when closed, casement windows are sealed and extremely energy efficient.
  • They have an advantage over double-hung or single-hung windows because their seal can be tighter due to less movement of individual parts which results in better insulation from noise and outdoor temperatures.
  • Tensioning devices are sometimes included in modern designs so that even when open, casements remain steady and resist being moved by exterior forces like strong gusts of wind.

Yes, you can crank Provia Casement Windows open all the way for full ventilation because their design allows the entire window sash to swing out. Homeowners may select a non-washable casement hinge, which pivots closer to the frame, allowing
greater viewing area and better function for egress requirements.

Exploring the advantages and drawbacks of casement windows provides homeowners with valuable insight into their suitability for various home designs and personal preferences. Below is a comprehensive summary of these aspects presented in a table format.

Enhanced energy efficiency due to tight sealHigher manufacturing complexity may increase cost
Customizable to fit different styles and needsRequires space clearance for outward operation
Offer superior ventilation capabilitiesMechanical cranks can wear over time
Increased security with multi-point locking systemsPotential for water infiltration when left open during rain
Low-E glass and argon gas enhance insulationMay need special hardware for emergency egress
Sound reduction benefits for a quieter interiorLimited opening angle in awning can affect escape routes
Excellent mid-range option with sturdy constructionCan be obstructive to outdoor walkways or patios
Varied design options, including Provia’s selectionSize and design limitations compared to other styles
Environmentally friendly by reducing energy usageRequires some maintenance to ensure longevity
Table of pros & cons of casement windows