(720) 573-2230
Houston, TX: 
(832) 621-3030
(720) 573-2230
Houston, TX: 
(832) 621-3030


Window Installation Service and Supplier Longmont, CO

  • Colorado’s #1 residential replacement Marvin and Integrity dealer and distributor

  • We also provide products for new house construction & home remodels if you can install yourself

  • Multiple types including contemporary styles, casements, double hungs, gliders/sliding, bays, bows, awnings, specialty, picture, basement and egress conversions

  • In addition to sales, we also provide financing, and painting/staining, unlike other companies

  • Many custom energy efficient options available, including wood interior, aluminum clad exterior, Ultrex fiberglass interiors/exteriors, double & triple pane glass, built in shades and various color and hardware choices

  • Purchase with confidence from the best local experts and installers

  • Give us a call today for your free inspection, estimates good for a full year

At CMC, we strive to be the Longmont window company you can trust to get the job done right the first time. We help our clients every step of the way through the process of getting their patio door and window replacement in Longmont, and we always strive to provide clients with an absolutely stunning result.

We want every project our team of professionals completes to be an upgrade, which is why we place so much importance on quality and thorough work in all of our projects. That is why we assist our clients from start to finish, giving them feedback and guidance during the process of choosing the right window or patio doors in Longmont that are best for their home. Once you have chosen the right models for you, we will have your windows and patio doors expertly installed in no time at all, securely sealed, and functioning just as they should. Finally, we offer a comprehensive warranty on all of our installations, so if anything is to go wrong after the initial installation, you can rest assured that we will take care of it for you, with no hassle on your part. Call us regarding our service warranty details.

In order to ensure that your patio doors or replacement windows in Longmont look absolutely breathtaking, we provide the widest selection of options possible so you can choose exactly the model that would look best in your home. Not only that, but everything we offer is extremely customizable, so you can choose precisely the finish, style, design, dimensions, and more that are best suited for your needs.

We provide only the best quality that the industry has to offer. All of our products are extremely energy efficient, and we ensure that they are well sealed during the installation process so you don’t need to worry about leaky windows or patio doors. Such a thing can quickly cause your energy bill to spike if your windows are not sealed well and getting replacement windows and patio doors is also a great way to ensure you are letting in plenty of natural light.

Quality That Proves Itself Each and Every Day  

At CMC, we believe that quality is the number one factor in our business. That is why we exclusively work with Marvin Windows and Doors for all of our materials, as they are an authority in the industry and consistently produce exemplary work for our clients.

Each Marvin product is made individually, custom made according to the client’s needs and preferences.  This ensures that every project is given the time and attention to detail it deserves.

Read about the two Marvin product lines we offer below.

Marvin Windows and Doors 

Marvin Windows and Doors has a reputation for consistently providing clients with windows and patio doors of top-notch quality. Boasting superior craftsmanship, attention to detail, stunning designs and styles, ultimate flexibility and customization, a high energy efficiency rating, and impressive longevity, Marvin Windows and Doors provides clients with everything they need and more.

Integrity from Marvin 

Integrity from Marvin is a whole new name in quality when it comes to windows and patio doors. Featuring everything that clients know and love about the Marvin brand, but with the addition of being made from the industry’s finest materials, the Integrity line is set apart by its inclusion of Ultrex fiberglass. Ultrex has made a name for itself in the industry over the past 20-years by consistently outperforming the competition in nearly every measurable aspect, and it is what gives Integrity from Marvin its excellent standard of quality.

Door Supplier and Remodeler Longmont, CO

  • Colorado’s best patio door company

  • Exterior styles include French double inswing and outswing, sliding glass, scenic bi-fold, lift and slide, and multi-slide

  • Buy from a locally owned and operated family business, quotes good for 1 year

  • Full service - replace, install, trim work, and painting/staining

Ready to get started on your window and patio door replacement today? You can request your free window and patio door consultation by simply calling us at (720) 573-2230 or filling out the form on our website.

Longmont, Colorado is home to amazing views and adventure for both residents and tourists alike. With everything from Rabbit Mountain to Longmont Museum and Cultural Center, there is plenty to see and do while in this wonderful city. Not to mention the stunning views the city has to offer and the scenic horizon it boasts from wherever you look. It is no surprise that residents want to show off such scenic views out of their patio doors or windows in Longmont to help add to the atmosphere of their homes.

Door Shop and Contractor Longmont, CO

  • ProVia exterior front and TruStile Interior doors

  • Steel and fiberglass entry systems with storm doors available

  • Best choice for style and security

  • Many interior styles offered, including barn, pantry, bedroom, bathroom, closet, bi-fold and French double doors for offices/studies

  • TruStile options include MDF, reserve and premium wood varieties, as well as decorative glass, resin inserts, leather panels and hardware options

  • Give us a call today for your free consultation

At CMC, we offer a complete window replacement service throughout Colorado, including the Longmont area. We understand how important windows and patio doors are to the beauty and style of a home, often becoming the focal point of a room due to their beauty and functionality.

If you are a homeowner in Longmont, you probably know all too well that, over time, windows can begin to look old, worn, and may even become leaky. It is important to keep your windows in proper condition, and that includes having them replaced when the time comes around. This will help keep your home looking up-to-date as well as save you money on your electric bill.

6950 S Tucson Way suite O, Centennial, CO 80112

Phone: (720) 573-2230


5829 W Sam Houston Pkwy N #503, Houston, TX 77041

Phone: (832) 621-3030


Copyright © 2022 CMC Windows LLC | All Rights Reserved
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