Window Installation

St. Charles County, MO Area

Lifetime Craftsmanship Warranty

A+ Rating With the BBB

Free Estimates Within 48 Hours

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Transform Your Home with Premium Window Installation

Gateway Exteriors has been enhancing homes in St. Charles County, MO and the surrounding areas since 1982. Our dedicated team of window installation experts brings over four decades of experience to every project, ensuring your home receives the highest standard of craftsmanship. We pride ourselves on our commitment to quality, attention to detail, and our use of only the finest materials available in the industry. Our approach isn't about quantity; it's about delivering exceptional results that stand the test of time.

As a family-owned and locally-operated business, we understand the unique needs of homeowners in our community. We don't rely on subcontractors; instead, our long-tenured employees handle every aspect of your window installation. This allows us to maintain strict quality control and deliver consistent, superior results. We offer a lifetime warranty on our craftsmanship, along with product warranties, giving you peace of mind long after the installation is complete. Ready to elevate your home's comfort, energy efficiency, and curb appeal? Contact Gateway Exteriors today to start your window installation project.

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Why Choose Us

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Lifetime Craftsmanship Warranty

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A+ Rating With the BBB

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Free Estimates Within 48 Hours

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In Business Since 1982

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Product Warranties Honored

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No Subcontractors

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Awning Window Installation

Our awning window installation service offers a perfect blend of functionality and style. These windows, hinged at the top and opening outward from the bottom, provide excellent ventilation even during light rain. We ensure precise installation for optimal performance and aesthetics.
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Bay Window Installation

Transform your living space with our bay window installation. These elegant, protruding windows not only add architectural interest to your home but also create additional interior space and allow more natural light. Our expert team ensures seamless integration with your home's existing structure.
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Casement Window Installation

Casement windows, hinged on one side and opening outward, offer unobstructed views and excellent ventilation. Our casement window installation service focuses on proper sealing and smooth operation, ensuring energy efficiency and ease of use for years to come.
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Double-Hung Window Installation

Double-hung windows are a classic choice, offering versatility and easy cleaning. Our installation process ensures both sashes move smoothly and seal tightly when closed, maximizing energy efficiency and comfort in your home.
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Energy-Efficient Window Installation

Reduce your energy bills and increase comfort with our energy-efficient window installation. We use advanced materials and techniques to minimize heat transfer, keeping your home cooler in summer and warmer in winter. Our team will guide you through the best options for your specific needs and climate.
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Single-Hung Window Installation

Single-hung windows offer a timeless look and great functionality. Our installation ensures the moving lower sash operates smoothly while maintaining a tight seal when closed. We pay close attention to proper insulation and weatherproofing for optimal performance.
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Sliding Window Installation

Sliding windows are an excellent choice for areas where you want unobstructed views and easy operation. Our sliding window installation focuses on ensuring smooth gliding action and proper sealing. We carefully align the tracks and use high-quality rollers for effortless operation and longevity.
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Recent Projects

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Here's what our satisfied clients are saying...

At Gateway Exteriors, we take pride in providing exceptional exterior improvement services to our clients. We would be grateful if you could share your thoughts about our business with others. Your feedback helps us improve and helps others make informed decisions. Please take a moment to leave a review of Gateway Exteriors and let others know what you think.