Take a look at our past work!

Lifetime Windows & Siding

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Lifetime Windows is a reputable window replacement and installation company with a strong presence in both Colorado (CO) and Arizona (AZ). With a commitment to providing top-quality products and exceptional customer service, Lifetime Windows has earned a stellar reputation in the industry. In Colorado, the company serves residents in Denver, Colorado Springs, and the surrounding areas, offering a wide range of energy-efficient windows tailored to the unique needs of the region's diverse climates. Whether it's combating the harsh winters or scorching summers, Lifetime Windows has the expertise to provide customers with windows that enhance the energy efficiency and aesthetic appeal of their homes. Their skilled team of professionals ensures a seamless installation process and stands behind their work with warranties that give homeowners peace of mind.


In Arizona, Lifetime Windows brings its expertise to cities like Phoenix, Tucson, and Scottsdale, catering to the specific challenges posed by the arid desert climate. They offer a variety of window options that help keep homes cool during the scorching summers while minimizing energy consumption. With a dedication to eco-friendliness and energy efficiency, the company provides residents in both Colorado and Arizona with a valuable solution for enhancing the comfort, beauty, and value of their homes. Whether you're looking to upgrade your windows in the Rocky Mountain state or the desert oasis, Lifetime Windows is a trusted choice for homeowners seeking premium window solutions in CO and AZ.

Our Work

16085 East Warren Place , Aurora, CO, US
  • Infinity: Bronze
Wyandot Street , Denver, CO, US
  • Anlin: White
15446 East Dorado Avenue , Centennial, CO, US
  • Anlin: White
2956 South Willow Street , Denver, CO, US
  • ProVia
13913 Fillmore Street , Thornton, CO, US
  • Infinity: White

Customer Testimonials

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Paulo Carlos
Had the best experience with Lifetime Windows and Siding. Mary Onelio was absolutely the best on keeping me updated and communicated every step. I love my new windows!
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Nichole Burke
Mary McLaughlin was so incredibly helpful and professional! Highly recommend Lifetime Windows and Siding for your home renovevention needs!
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John Kimes
Lifetime windows and siding replaced all 20 windows of our house. the siding crew replaced the insulation, sheathing, wrap, insulation, and put on hardy board siding all in according to hardy board strict directions. We have R19 walls in a very old house. It took 4 weeks and they did it quickly and professionally and did a wonderful job. The crews were hard working on time and performed with a high level of skill. They did this with great attitudes joking with each other and just great to...Read more
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Rory McLaughlin
Mary Elizabeth Oneilio was the greatest customer service rep I have ever dealt with in my life. It was the most delightful experience her bubbly personality turned my horrible day into a ray of sunshine. She was filled with happiness and very helpful with my install question
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Liz Hodson
Can't say enough good things about the Lifetime Windows team who just installed our new windows and doors: estimator Erik, and installers Tim and Dan...on point from start to finish! Highly recommend them!