Memorial Day: Closed
Mon-Fri: 10:00am-6:00pm
Saturday: 10:00am -3:00pm
Memorial Day: Closed
Mon-Fri: 8:00am-6:00pm
Saturday: 8:00am-3:00pm
If your home feels drafty in the winter or overheated during St. Louis summers, your windows and doors may be costing you more than you think. From humid July afternoons to freezing January mornings, Missouri weather demands products built to perform year-round.
At Next Door & Window, we specialize in professional window replacement in St. Louis using industry-leading Ultrex® fiberglass products from Marvin and Infinity by Marvin. Our team helps homeowners upgrade comfort, improve energy efficiency, and increase curb appeal with premium materials that outperform traditional vinyl alternatives.
Whether you prefer a virtual consultation, an in-home visit, or a stop at our local showroom, we make the process simple and pressure-free. As one of the most trusted window companies in St. Louis, we focus on craftsmanship, transparency, and long-term value.
We make it easy to begin your window or door replacement project.
We offer:
During your consultation, we will:
When it comes to window installation in St. Louis, homeowners want style, durability, and performance. We offer a wide range of window styles designed to match your home’s architecture and improve energy efficiency.
Available window styles include:
You can explore design inspiration and see how different styles transform homes by visiting our Inspiration Gallery.
Most window replacement projects in St. Louis can be completed in one to two days, depending on the number of windows and the complexity of the installation. During your consultation, we provide a clear project timeline.
Yes. Our products include strong manufacturer-backed warranties, and our installation workmanship is also covered. Warranty details vary by product, and we review them carefully during your consultation.
Yes. We offer financing solutions to make the cost of replacement windows and doors more manageable for homeowners. Our team can walk you through available options during your estimate.
Yes. We offer financing solutions to make the cost of replacement windows and doors more manageable for homeowners. Our team can walk you through available options during your estimate.
Yes. Ultrex fiberglass frames are engineered to resist expansion and contraction, helping maintain a tight seal during freeze-thaw cycles common in the Midwest. Paired with energy-efficient glass packages, they provide strong winter insulation.
We install double-hung, casement, sliding, bay, bow, picture, awning, and custom-shaped windows. All are available in premium fiberglass frames designed for durability and long-term performance.