skip to Main Content
Exclusive Savings: $1,200 Off Any Combination of 3 Windows or 1 door + $200 Entire Project*

Renewal by Andersen® Window Replacement & Patio Doors in Longmont, CO

Renewal by Andersen serves Longmont, CO, with full-service window replacements and door installations. Transform your home with Renewal by Andersen custom windows and doors.

Our Products

Renewal by Andersen® Signature Service

Superior product.

Fibrex® material is a composite material combining vinyl and recycled wood in order to provide a more durable, energy-efficient window frame material.

Hassle free process.

With one phone call, Longmont homeowners can begin the window replacement process. From design to installation, Renewal by Andersen manages every stage of your installation project with a streamlined, hassle-free process.

Unrivaled beauty.

Design your own custom windows with Renewal by Andersen professional designers. We offer a variety of window and door styles as well as over 50 custom options to match your house.

Long term value.

At Renewal by Andersen, we are committed to adding value to our customers’ homes. Our custom windows and doors can boost your property value, reduce your energy bill each year, and transform any dull space.

4-Step Process

Design Consultation

Professional designers are available to help homeowners design the best windows or doors for their homes. A consultation also includes a project estimate and tentative timeline.

Project Planning

Renewal by Andersen takes attention to detail one step further. We measure your current windows with additional precision, evaluating them to the 1/16th of an inch.


A Certified Master Installer leads a team of experienced, local installers through our well-defined process. Our goal is to complete your project efficiently with minimal life interruption for your family.

Customer Care

Call our customer care team with any questions or concerns throughout your project. Even after the installation has been completed, this team can help you navigate warranty information and more.

About Longmont, Colorado

Longmont is a sanctuary for outdoor enthusiasts with its expansive parks, over 1,500 acres of open space, and more than 300 days of sunshine a year. Strategically located, Longmont offers easy access to Denver, Boulder, and the Rocky Mountain National Park, positioning it as a central point for both adventure and opportunity in the St. Vrain Valley.

Renewal by Andersen enhances Longmont’s homes by offering the best local window replacement and door installation services, tailored to match the city’s unique lifestyle and weather conditions. Our energy-efficient products are designed to leverage Longmont’s sunny days, providing comfort and reducing energy costs, while our durable, stylish designs complement the city’s scenic views and modern aesthetics.

With Renewal by Andersen, enjoy the beauty of your surroundings in comfort and style. Discover why Renewal by Andersen loves Longmont as much as you do, providing solutions that make every home a perfect place to live and thrive.

colorado image 2

Replacement Windows

Renewal by Andersen near Longmont, CO, delivers custom window installation service to homeowners in the surrounding areas. Each of our window styles is designed to improve the look and function of your house. We offer seven custom window styles with over 50 customizations so homeowners can create the perfect window for their homes. Our Fibrex® material window frames are twice as strong and last twice as long as standard vinyl windows.

Awning Windows

Awning windows are characterized by their hinged top, wide base, and crank-style handle. These windows improve airflow by creating a weatherproof hood when open. Best located above the kitchen sink.

Bay & Bow Windows

Bay and bow windows are projection windows that add dimension to any room. Each window has a collection of window panels. Homeowners often add shelving and a bench to optimize space.

Casement Windows

Casement windows are the most versatile and energy efficient windows from Renewal by Andersen. They’re designed with an outswing configuration and crank-style handle to secure and to ventilate any room.

Sliding Windows

These space-saving windows are ideal for small or cramped spaces that need direct airflow. Sliding windows are also called gliding windows because they open by smoothly gliding along a rail.

Double Hung Windows

One of the most common window styles is the double hung window. This window is designed with two vertical sashes and a durable lock to keep your home secure. Customize the colors, handle style, and grille design to complement your unique home.

Picture Windows

Picture windows are a stationary window, perfect for high ceilings or attic windows. These windows primarily add style and boost energy efficiency in your home. Enjoy more natural light and lower energy costs!

Specialty Windows

A specialty window from Renewal by Andersen can be the statement design element your home needs. With the largest collection of custom options available, homeowners enjoy adding flair in any room. Specialty windows are stationary windows and can be combined with other windows for a more complex design.

Patio Doors in Littleton, CO

Renewal by Andersen patio doors can fill your home with natural light while reducing your energy bill. Our glass door styles provide easy access to your backyard and add dimension to your home. We offer contemporary sliding patio doors, French-style sliding patio doors, and hinged French patio doors. Each custom door style is designed to keep your home secure and to keep air leaks from affecting your home’s temperature.

Sliding Glass Patio Door

The contemporary sliding patio door is ideal for modern-style homes. This patio door style is designed for smooth operation and for saving space. Sliding glass doors also offer wide open views and more natural light while maintaining a comfortable temperature in your home.

French Sliding Patio Door

If you’re looking for a convenient sliding patio door with a touch of elegance, the French sliding patio door is the best style for your home. Select grille designs and colors that complement your house.

French Hinged Patio Door

Choose a classic patio door style for your traditional-style home. Our hinged French doors are designed with adjustable hinges for custom swing configurations. Custom options and a design consultation can help homeowners make these glass doors the perfect design element to add to their homes.

Learn More
Entry Doors

Protect your home with a custom front entry door. Renewal by Andersen offers the opportunity to create the best first impression of your home with hassle-free installation services in Longmont. Legacy™ Steel entry doors provide additional security and storm protection for Longmont homeowners. These steel doors rank highly for their energy efficient qualities and durability. Each door is designed with insulating foam to prevent leaks and drafts from affecting your heating and cooling costs.

Legacy Steel

ProVia offers Legacy™ Steel entry doors to provide additional security and storm protection for homeowners in Longmont, CO and the surrounding areas. These steel doors rank highly for their energy efficient qualities and durability. ProVia uses insulating foam to prevent leaks and drafts from affecting your heating and cooling appliances.


I love my new windows, made a HUGE difference in the drafts, keeping wind noise out, and keeping heat in. I also choose a different style and the view is much nicer, easier to open and close

Tonya B.
Rating: 5

We are extremely pleased with our large dining room window. The old window was not efficient; letting cold air into the house in the winter as well letting heat from the furnace outside! The installer was very professional, efficient and cleaned everything up nicely. The entire experience from sales to installers through follow-up was a pleasure.

Seth Y.
Rating: 5

Replaced 12 "old" draft double hung windows with new double hung windows. Remarkable improvement in maintaining and constant comfortable temperature in the rooms. Great workmen and a great finished job.

Tangelia N.
Rating: 5

Proudly Serving Longmont, CO and the Surrounding Areas

Homeowners value the professionalism of Renewal by Andersen® Signature Service. We combine the best people in the industry, a superior process, and an exclusive product. Our goal is that your family experiences minimal life interruption and enjoy your custom windows for years to come. Schedule a free design consultation today to get started!

  • Altona
  • Berthoud
  • Buda
  • Dacono
  • Del Camino
  • Firestone
  • Hygiene
  • Lazy Acres
  • Lyons
  • Mead
  • Niwot
  • Puritan

Renewal by Andersen Signature Fibrex® Material

Renewal by Andersen has developed a composite material that blends recycled wood and vinyl to create Fibrex® material.
This composite material is twice as strong as standard vinyl, allowing installers to place larger panes of glass in your custom windows and enlarging your view.
Fibrex® material is a durable composite material that maintains the look of your windows for years to come.
Overall, Renewal by Andersen is committed to providing replacement windows with long-term performance and durability.

Get in Touch with Us

Call Renewal by Andersen in Denver to schedule your in-home consultation today. Our professionals are committed to simplifying every step of the process, so you can enjoy your new home improvement sooner than you think. Contact us to learn more about our hassle-free, 4-step process.

Welcome to Renewal By Andersen! How can I help you?