Residential Replacement Windows

Give us a call, we install them all!

We Like Our Alside Windows, But We Offer One-Stop Shopping for All Major Window Manufacturers, Including Marvin, Pella, Jeld Wen and The Rest! Save Yourself The Hassle and Give Us a Call, We Install Them All!

For the best window service in the area, contact us today. With over 25 years of experience, Mills Window & Door can quickly and affordably install windows in your home or business!

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    Quality Replacement Windows

    At Mills Window & Door, we offer window installation services on ANY brand of windows, regardless of if we carry the products in our showroom. We know that each resident in St. Louis and surrounding areas has a different style in mind when it comes to their individual window and door needs. Whether you are renovating an old home or breaking ground for your new construction home, you can trust our professional window sales and instillation specialists to help educate you and fit your specific needs.

    Mills Window & Door offers a number of new and replacement window options in styles ranging from traditional to contemporary, and in various sizes such as Single-Hung, Double-Hung, Sliding, Casement, Awning, Swing & Clean, Bay, Bow, Garden, Picture and Specialty Shaped Windows to fit your home’s precise style needs. We also carry and install Energy Star approved vinyl energy efficient replacement windows, which will keep your home warmer in the winter and cooler in the summer. In addition to a variety of window configurations, styles and colors, we have an extensive choice of grid patterns and glass styles to create the perfect finish to your window and home design project.

    Can’t find what you’re looking for? We install it all! Mills Window and Door offers services above and beyond the products we carry in our showroom, giving you the ability to choose from any window style or brand. We’ll even work with the manufacturer to get you the best price and have our professional service team install them!

    When you purchase new products that meet energy efficiency guidelines you may be eligible to take advantage of temporary tax credit incentives. Mills Window & Door’s premium windows by Alside and other major brands may qualify for valuable energy tax savings. Please contact your Mills Sales Representative for more information.

    Custom Made

    Our windows are custom-made to fit your current window openings precisely.

    Custom Fit

    Our windows are custom-made to fit your current window openings precisely.

    Easy Install

    Our windows are quick & easy to install and they often require no additional wall construction!

    No Additional Construction Needed!

    Our windows are easy to install and they often require no additional wall construction!

    Energy Efficient

    Many of our window styles offer increased energy efficiency. Save money while helping the environment!!

    Energy Star Rated

    Many of our window styles offer increased energy efficiency, allowing you to keep your home cool during the summer, warm during the winter & save money!

    Lifetime Warranty

    We offer an Alside manufacturer lifetime warranty on all of the Alside windows we carry.

    Quality & Performance

    We offer a manufacturer lifetime warranty on all of the Alside windows we carry as our lifelong pledge to quality and performance.

    Vinyl Replacement Windows

    Sheffield Fusion Welded Vinyl Windows

    Sheffield®/Ultramaxx Fusion-Welded Vinyl Windows

    • The ultimate choice for maximum beauty, strength and energy savings
    • Sheffield’s outstanding performance starts with innovatively engineered components that provide the basis for superior energy savings
    • Built for exceptional appearance and trouble-free operation

    Mezzo Energy-Efficient Vinyl Windows

    Mezzo® Energy-Efficient Vinyl Windows

    • Designed to meet stringent 2015 ENERGY STAR® requirements
    • Narrowline frame and sash maximize daylight visibility
    • Sash-to-sill interlock design provides maximum performance and beauty
    • Composite meeting rail reinforcement provides strength and minimizes energy transfer

    Fusion Quality Vinyl Windows

    Fusion™ Quality Vinyl Windows

    • Designed to provide energy efficiency and thermal protection year-round
    • Quality craftsmanship means your windows will maintain their attractive appearance inside and out with minimal upkeep
    • Premium vinyl mainframe and sashes won’t rot, split, corrode or pit

    0700 Single-Hung Vinyl Windows

    Model 0700 Single-Hung Vinyl Windows

    • The best solution for residential and light commercial applications
    • Multi-chambered sash and mainframe create insulating air spaces for superior thermal efficiency
    • The sleek lines surrounded by an appealing beveled mainframe make the Model 0700 a wise choice

    Specialty Windows

    Why Choose Us

    • We Install All Brands of Windows, Doors & Siding, Even if We Don’t Carry It!
    • 25+ years of Window, Door & Millwork Industry Experience in the St. Louis Area
    • We Are Known for Our Quality, Value, and Excellent Customer Service
    • We’ll Work With the Manufacturer to Get You the Best Pricing!
    • We’re a Hands-On Owner Directed Company, Small Enough to be Personal & Cost Effective, With the Resources to Get Your Job Completed.


    I’ve had the pleasure of working with Jim and his team on two projects recently, and cannot say enough good about them! They truly care about the work they do, which makes doing business with them so easy and I can rest assured that they have our best interests at heart.
    Amanda M.
    We have used Mills Window and Door a number of times. The biggest project was the installation of 400 windows in a six story high rise complex. They did a superb job, and their product was excellent.
    Patricia S., Personalized Property Mgt., Inc.
    During my tenure as Director of Facilities and Grounds, Mills Window and Door successfully provided and installed custom windows for several historic structures at the Saint Louis Zoo. The Zoo was quite satisfied with the installation and the windows. We would not hesitate to award similar work to Mills Window and Door in the future.
    David M. Vice President Architecture and Planning, Saint Louis Zoo
    Mills WIndow and Door installed 454 windows on our Barclay Facility in Clayton. We were very satisfied with the outcome and would not hestitate to engage them again.
    Joseph B. CEO, Bethesda Health Group