Lifetime Windows and Siding offers high quality, energy efficient replacement windows, siding and doors from leading American manufacturers in the Denver metro area.

They hope you will find their website informative and will be very happy to talk to you personally over the phone or at your home about any questions you might have in regard to their products. They are committed to serve YOU for a LIFETIME!

Services Offered:

  • James Hardie Preferred Contractor
  • Siding Replacement
  • Siding Installation
  • Vinyl Siding
  • Metal Siding
  • Wood Siding
  • Stone Veneer

Google Reviews

Lifetime Windows & Siding Rating: 4.6

Juan Vigil

Mar 04, 2024
Update to this review: Lifetime came out and fixed the issue with the spray foam. Jon Stone was super friendly and completed […]

Christa Hafemeister

Feb 09, 2024
From start to finish my experience with Lifetime Windows has been too notch. I am thoroughly impressed with not only my new Anlin Windows […]

Don M

May 01, 2024
I recently ordered and had installed 6 windows and a Sliding glass door from Lifetime. I had a great experience from the sales […]

Aaron Richardville

Apr 12, 2024
I had lifetime install new Infinity from Marvin windows and they are beautiful! I needed a small adjustment with my patio doors and called […]

April Baumann

May 31, 2024
I had Lifetime come out and put in windows upstairs and two big bay windows downstairs in my home that way I can put […]

50 Recommendations

Please provide us with the following before posting your endorsement

The entire process was fast and easy. It's like I had a brand new house with little effort. The workers were respectful and swift and explained what I needed to know about the windows and siding.

Ryan Y.
  • We worked with the Lifetime Window Company for the purchase and installation of a new picture window and side windows in our living room. They were very easy to work with, dependable and fair. The installer was prompt and did a fine job installing the windows. We have appreciated the improvement in the appearance of our home and also, the fact that we are much warmer in the winter due to the elimination of drafts in the living room. We are happy with our choice of Lifetime Windows Company and feel free to recommend them.

    Jan and Del W.
  • The windows have reduced the noise level I hear from my neighbors drastically. My house stayed a lot cooler last summer and my excel energy bill was $75 less per month than previous years and winter heating bill was also about $50-$100 lower than previous years. This was what I was hoping for. My old windows were very leaky and as a result, I had very high utility bills trying to cool and heat my house. Overall, I am happy with the windows.

    Karissa S.
  • I was extremely pleased with my experience with Lifetime Windows and Sid in and their employees. The crew was processional, diligent and took great care of my dog all day! The windows are definitely an improvement in my older house and my electric and heating bills have dropped significantly. The house remained much cooler this summer than in the past and my air conditioners didn’t run constantly in energy saver mode. I would highly recommend Lifetime to other homeowners considering this type of upgrade to their home.

    Lisa C.
  • Lifetime Windows and Siding installed new windows in our home on the 18th drive in Lakewood in the Fall of 2013. We had them install the Fairfield 80 series windows, and screens. Mr. Dan Boskovic was the salesperson who sat with us more than once to discuss our needs, what we could afford, and which options would best fit our home. Dan showed us several window options. Once we had decided on the Fairfield 80 series windows, it was just a matter of taking measurements of our old windows and ordering the new replacements. All of the windows were custom made. When the windows were ready for installation, we set up an appointment with their installers to come out and put them in. three young men showed up as promised and worked extremely hard tearing out our old windows and installing our new windows. These young men were very friendly and courteous and filled our every wish. They were very competent, experienced, and did a great job of cleaning up all of the debris from the installation. Our windows are triple paned, and we couldn’t be happier with them. The noise would occur with our old aluminum framed windows. I’m not sure yet of the exact dollar savings that we are incurring with our new windows, but we are noticing a change in our utility bill. We would be happy to talk to anyone who is interested in new windows and the great people at Lifetime Windows and Siding.

    Mike and Cheryl K.
  • We had Lifetime Windows installed 9 months ago. We have been very happy with them. Everyone that we dealt with was courteous and processional. They were installed quickly and looked great. We noticed a huge improvement immediately. I would highly recommend these windows to anyone. Our indoor comfort level is much better. Thank you everyone at Lifetime for a great experience!

    Mike C.
  • Over the past few years Lifetime Windows and Siding has replaced nearly every window in our home. We have been extremely satisfied with the high quality windows as well as the workmanship and professionalism of the installers. The combination of low prices and a full lifetime guarantee make the windows an outstanding value. When we accidentally put a whole in one of the screens, Lifetime Windows replaced the screen promptly and courteously with no questions asked. We look forward to enjoying the look and efficiency of our beautiful new windows for years to come knowing that Lifetime Windows will take care of any concerns with their wonderful customer service.

    Shelly and Paul H.
  • Our experience with Lifetime Siding has been exceptional from beginning to end. The salesman came to our house on time and was very thorough and patient in explaining all the siding options and colors that they offered. Once our order was placed, several people reached out to keep us up to date on the steps leading up to the install. They are quick to respond to e-mail and phone calls for any questions we had. The installers that came out were really hard workers and detail oriented. They listened to us and made sure we were satisfied with the job. They also did a really good job cleaning up afterward. We are very impressed with how good the house looks and would highly recommend Lifetime to anyone for siding.

    Andrew S.
  • Just wanted to let you now how much we are enjoying our Triple Paine patio doors. We live near the train and the horn sounds like it was coming thru the bedroom. But now the noise is greatly lowered and we look forward to the winter without frost on the glass. We live in a high rise in Old Town Fort Collins but it was no problem for the installers coming up to the 10th floor on the elevator. They did a great job which included the cleanup. Your help in getting monthly payments interest free with no down was a super decision making reason why we went with Lifetime also.

    Bill and Karen C.
  • We had siding and windows installed by Lifetime Windows and Siding in the summer of 2013. The men who did the job did an excellent job on our house. They were clearly very experienced at what they do, because it turned out perfect. It was done in a timely manner, and they were very respectful to me and my family. The guys did such a good job; we tipped them each $100. So far, the siding and windows are showing no signs of wear, weather, or age. We have been very happy with Lifetime Windows and Siding, and I would definitely recommend it to others. The price was more than reasonable, and the service was awesome.

    Anne N.
  • The purpose of this letter is to thank you and all of your staff for the wonderful job you did at my residence this past year with the siding and gutters even during the difficulties of the environment (Winter) looks great. Thanks also for being accommodating and modifying what I requested regarding the gutters. My house looks great on the outside now. I would certainly recommend you to others seeking siding and gutters.

    Yvonne B.
  • My wife and I are retired, we live on a limited income, so we strive to economize in any way we can. This means heating bills, electricity etc. last year we were approached by Lifetime Windows and Siding to improve the insulation in our house by replacing our degrading windows. As I mentioned our income is limited so we were only able to replace the windows in the front of our home. The difference it made this winter only made me wish I could’ve replaced the whole house in new windows. My wife says they are a snap to clean, all done from inside the house. The installers were very professional, courteous, and did their work with the least disturbance possibly to us. In the future if finances permit, I’d like to get the rest of the house windows replaced.

    Sil and Linda F.
  • We had our 13 windows and sliding glass patio doors replaced in January 2013 by Lifetime Windows. Because the weather was unseasonably warm, they were able to do the job in just 3 days. The sales rep was very personable and promised us a lifetime warranty with the windows. The company went by the book for regulations. Even did lead testing and inspection on our homes original bottom tile frames. One of the window screens was damaged in transit and another window had a broken lock, but they were quickly replaced. The work was done fast and there was clean up every day. We felt that Lifetime Windows were very professional and punctual. Would refer their service.

    Margaret and Michael C.
  • I signed a contract with Lifetime Windows and Siding in October 2013 for replacement of two large windows and a sliding patio door. About six weeks later an appointment was made for the work to begin. On the appointed day three young men arrived early in the morning and very soon the work began. They went about the task very efficiently and by late afternoon the project was finished and all the debris was cleaned up. I have been very satisfied with the windows and happy that they keep some of the cold from coming through during the winter and have helped with the heat from the sun coming in during these hot days. I like that the windows have two latches that lock so I know my home is more secure. The windows are good looking and are guaranteed for as long as you live in your home. If anything goes wrong including breakage the guarantee covers all. Working with this company was a good experience and plan on having more old windows replaced with new windows.

    Loretta M.
  • We want to let you and all of the folks at Lifetime Windows & Siding know what an excellent experience it was dealing with everyone at your company from beginning to end. We were initial attracted to Lifetime when a gentleman came to our door one evening handing out flyers to your company. There was absolutely no pressure and no sales pitch, strictly a pamphlet and a friendly invitation to call with any questions about future window replacements. We didn’t’ even have window replacement on our radar at that point, but the invitation was enough for us to start investigating. We made the call to find out more and Dan Boskovic, who came to our home, was excellent. He was friendly, knowledgeable and explored all of the different scenarios involving possible window replacement. All of this was done with absolutely no pressure or with a goal to get a sale at the end. It was an easy decision to move forward with Lifetime Windows & Siding to replace our original 1937 windows after our visit with him. We have now gone through a winter and summer with the new windows in, and what a difference it has made. Our heating and cooling bills have gone down, but the biggest difference is the overall comfort in the house, especially in the bedrooms. The noise level in the house has also decreased. We had not realized how much of the outdoors we could hear in side of the house before. We would definitely recommend Lifetime Windows & Siding to anyone thinking about replacing or upgrading their windows. It is not often that one finds a company with both excellent service and superior quality product. We have certainly found that in Lifetime Windows & Siding.

    Ken and Kathryn F.
  • I am writing today to thank you and your company for hitting it out of the park, to coin a phrase. Not only were the windows we purchased last November, the triple-pane model, of the highest quality, our experience with your employees has been amazing. From the canvasser who rung our bell to the salesman who visited our home to the measuring guy to the installer, I was struck by the quality of people you employ. We enjoyed your quiet and warm windows over the winter but are especially enjoying them in the hot weather. At last we can easily open windows in our holder house. The swamp cooler air can finally flow to the living room without the front door being open, our modesty is restored. We only regret we couldn’t do all of our windows last November. We are looking very forward, however, to purchasing the remaining windows from Lifetime, at our earliest financial convenience. Thanks again for doing a great job and feel free to stick a sign in my yard when my landscaping is complete.

    Daniel C.
  • I am very happy with my recent purchase of two windows and one sliding door through Lifetime Windows and Siding. The entire process was made simple and went smoothly between my interaction with the marketing director, the administrative staff, and the installers. We had just completed a remodel of our mid-level and the windows and door added the final touch making the room ore aesthetically pleasing and we can already tell the difference in temperature after the last few hot days. The installation crew was processional and even went out of their way to ensure the windows look their best; my original order was for oak windows and pine trim, however, the installers on site state that would not look right and changed the order to oak trim at no additional charge to me. Also, the installers made a quick trip to the lumber store to replace a rotting 2 x 4 under my sliding door at no additional charge. I recommend Lifetime Windows and Siding for the purchase of an installation of windows and will definitely use them again for more window replacements.

    Dean K.
  • I wish to thank your company for installing the vinyl, Dutch lap Monterrey sand siding on my home last spring. I can’t tell you how much I appreciate this quality product. First of all, since I have a bad back, I will no longer have to paint my house. Second, my home is easy to maintain. If the siding gets dirty, I just hose it off. Third, it helped on my heating bill last winter. Because of the insulation foam inside the vinyl siding, most of the nights I was able to completely turn off my furnace. Thanks again for your quality product.

    David C.
  • Lifetime windows are a great company to work with. Marcus came to the house to give a quote, no drama, no pretending, just got down right to an affordable pricing. Learned quite a bit about windows sale tactics that others would employed from Marcus. I had 3 quotes before Lifetime Windows. Those quotes were all over the range which made it difficult to pin down the true cost. Lifetime windows came in the middle of the line and from their brochures; the window specification was way above others for the type of window I want to install. Every detail of installations, materials and warrant was written in the sale contract. Basically, this would be the last window cost for my place. Installation was good. Lifetime Windows did everything they agree4d to do and more. Recently, I have a torn screen by an animal, Lifetime Windows came over to replace it as stated in their warranty without hassle. Working with Lifetime Windows was a pleasure. I highly recommend Lifetime Windows for reasons below (and I had already recommended Lifetime Windows to several neighbors already). 1) Great people to work with, 2) priced right, not the cheapest but right, 3) window quality exceeds expectation. Great energy saver, 4) hassle free warranty service.

    Tom C.
  • My home is thirty years old, and had its original wood windows. After 3 years the windows need a good cleaning but I remember looking out the windows and being amazed at how clear the view was. I never really realized how bad my old windows were until the new ones were installed. I have been tracking my utility bills for the last 4 years, since the installation of windows (only the upper ½ of the house) our utility bill has gone down $50 a month during the winter months. I don’t have central air but I am sure if I did we would see a savings those months also.

    Tena N.
  • We had 65-year old windows with chipping lead paint. Lifetime provided a competitive estimate for replacing six windows with quality windows that fit our budget. Each step of the process: window selection, window measurement, lead testing, and installation was performed in a timely manner by knowledgeable and friendly staff. The installation team was processional and took precautions for working with the chipping lead paint. They installed all six windows in one afternoon and left the work area spotless. We had high expectations and we were still impressed with the quality of the installation. We are pleased with the value of our purchase and will recommend Lifetime Windows to friends and neighbors.

    Tim and Rebecca
  • My husband and I had Lifetime Windows install replacement windows in our Erie home in the fall of 2012. Initially, we had all the windows upstairs and our sliding glass door replaced, but we were so pleased with the results, we then had them replace the windows in our basement as well. The experience we had with Lifetime was exceptional. From the moment we were initially contacted by the sales staff to the final payment after the installation was completed, we found their personnel to be extremely helpful, friendly, and professional. All of our questions were answered clearly and concisely and we had complete confidence that the work would be done to our satisfaction. The scheduling process was quick and easy, then workers showed up on tie and did a fantastic job. The installation itself was done in just one day. I admit that I was a bit skeptical when the salesman told us about the projected energy savings – but not only did we save hundreds of dollars on heating during the winter while staying nice and toasty warm, we were able to survive the summer months in cool comfort WIHOUTH any air-conditioner! The savings are just as promised – and we even found out that our house had increased significantly in value. In conclusion, I would recommend Lifetime Windows without hesitation to anyone who wants to increase the value of their home, save money on their utility bills year round, and (most importantly) have a home that is comfortable winter or summer. Having Lifetime Windows I our home has truly improved our quality of life.

    Norma and Brent B.
  • As homeowners we have been very pleased with the purchase of our windows from LIFETIME windows and siding. The windows are very efficient in keeping our home cooler in the summer and warmer in the winter. The windows are very easy to clean, which is a rea plus. We were treated with respect and professionalism from everyone at LIFETIME windows, sales people, office staff, and installation men. We would highly recommend the product of LIFETIME windows and siding to anyone who is considering replacing windows or siding on their home. The windows are beautiful to look at, very cost efficient in heating and cooling your home, and a very affordable improvement to your home. We would be happy to provide anyone with the details of our experience with LIFETIME windows and siding. We highly recommend their products and think you will be pleased with your decision if you decide to use them for your home improvement.

    Pamela S.
  • Lifetime windows did a great job on my windows. I am very pleased. Their installers were very clean and efficient. They worked till they were done and did not take any breaks. My windows look great.

    Paulette M.
  • We knew we desperately needed new windows, however every estimate we had was way over our budget. When we looked at Lifetime’s product, and evaluated their estimate, we decided to go with this company and we have never regretted our decision. The windows keep out street noise and also are very energy efficient, besides adding to our curb appeal. It is nice to be able to easily open them and let fresh air in. Our old windows either wouldn’t slide any more or would not stay up by themselves. They were installed so quickly that I went to work and came home to all new windows in my home!

    Dianne and Dave
  • I am writing about the Lifetime siding with your home reference referral program. I am very satisfied with the siding placed on my house; we noticed the house was warmer last winter as the prep work and siding, cut out drafts. The house looks good from the street as I needed to replace the siding on the back from a hail storm.

    Betty H.
  • In reference to your letter wanting to know how we life the windows, now that we’ve had them for a while. We really like them. We have no more frost on the windows, when it got cold last winter, like we had with the old windows. No mold inside on the bottom and sills. They say nice and dry. You can’t feel the cold when you put your hand up close to the glass, like you could with the old windows. This makes the house more comfortable and easier to heat. The man that put the windows in did a real good job. Please tell him we appreciate that so much. I missed him when he came by to check them and make sure everything was okay.

    Clarence L.
  • I am writing this letter about my experience with Lifetime windows. I had three Excalibur windows installed in my house in November of 2012. I have not had any problems with any leaks or other malfunction of any kind. The windows work just the same as the day they were installed. The crew that installed the windows were at my home on the day and time agreed upon. They did a good job removing the old window and cleaned up everything when they finished and cleaned the windows also before they left. So in closing I’m happy with the way the windows work and how they improved the look of my home and also make my home more secure with how they look.

    Dan S.
  • I am writing this letter in regard to my experience with Lifetime Windows and Siding. Everyone I worked with was very professional. The installers were very easy to work with and answered any questions I had. There is a very noticeable difference in the comfort of the house. We use to notice a lot of drafts coming from the original windows we had in the house. That is no longer a problem.

    Roxanne S.
  • We have been extremely pleased with Lifetime Windows and Siding. We have had 2 jobs done. Their work is excellent! We did have both the siding and the windows installed, the work was perfect.

    Rosemary S.
  • We are very satisfied with our purchase from Lifetime Windows! We had our entire upper floor done and had no temperature problems for the duration of the hot summer! Not only that, but the windows themselves clearly of very high quality. They operate very smoothly and much more easily then our previous windows did. It is only a matter of time before we go ahead and get the rest of the windows in our home replaced! We will definitely be purchasing from Lifetime again!

    Tom and Linda J.
  • Overall service was outstanding, price was much better than others. At one point I showed Lifetime's quote to another sales person and he advised me to use them as he couldn't get within a $1000 of their quote.

    Satisfied Homeowner
  • Our neighbors used Lifetime Windows and Siding and they did an outstanding job on their house. I received bids from 3 other companies before we decided to go with Peter . The price was reasonable and the craftsmanship was superb. The crew was professional and the job was completed on time. I highly recommend Lifetime windows and siding.

    Satisfied Homeowner
  • Everything turned out really well. I was pleased with their services. They were professional, helpful, and respectful. Their product great and they did what they said they were going to do. I would recommend them to others.

    Satisfied Homeowner
  • I was impressed with the sales man, and I was impressed with their professionalism, and I really appreciated all the little extra things that they did, and I would hire them again. The price was reasonable.

    Satisfied Consumer
  • Jason and Peter of Lifetime Windows and Siding have dedicated themselves to being one of Colorado's elite remodel contractors and proactively manage their business to provide top quality customer service. Lifetime Windows and Siding is committed to using only the best products available and truly understand that each project requires a combination of management, materials, and craftsmanship to achieve their goal of 100% customer satisfaction.

    Craig N. Bailey, Alside Denver Supply Center Manager
  • Within one day, I was amazed how the old siding was pulled off - new was installed complete with insulation. Top notch at cleaning up! Prompt, courteous, and ever so professional.

    Mike C., Arvada
  • Lifetime is an excellent company!! Unlike many other companies whom I spoke with or saw, when they came to give an estimate, they were prepared with various options. They also gave an honest assessment and estimate for the work to be done, and completed our vinyl siding in a very expeditious and professional manner. I am very happy with the results. Along with being very professional, the Lifetime staff was genuinely down-to-earth and very nice people. Thanks again guys for all your help.

    Adrian L., Aurora
  • Marco was great during the sales presentation. Can't wait for the windows to be installed.

    Dane Klingbeil
  • I am writing this review 2 years after Lifetime Windows replaced all of my windows because of hail damage. These guys are the best of the best. After our storm 2 summers ago we dealt with a lot of contractors from roofing to painting to windows and I need to say that Lifetime windows was hands down, by a mile the best of the best company we dealt with. And when they say Lifetime windows, they stand by it! Last year I returned from vacation to find one of my windows broken. I have no idea what happened but I called Peter and the next week I had new glass in my window free of charge! Wow! What amazing customer service and my wife and I love our windows and I am sure we will continue to love them for years!

  • Jason Lewis was easy to work with, very professional, and came across as very open and honest in his presentation and of his product. There was no hard sell at all. The job was done on time as indicated, and the installation was done in a day. There was also a follow through thank you card in the mail which can certainly make every client feel good and appreciated. I would not hesitate to recommend Lifetime Windows and Sidings, especially that the product has a lifetime guarantee.

    Dolly B.
  • Courteous, professional, accommodating, and truthful. They were there when they said they would, were very interested in educating me on the windows, cleaned up after themselves, and entertained any question I had. From the sales person (Peter) to the guys installing the windows, my wife and I had a great experience with this company. Were it not for the inclement weather, all the windows would have been installed in one afternoon. The windows look great and we are very pleased with Lifetime. When we need to replace the rest of the windows, we will be giving them a call.

    Shaun T.
  • Peter and his crew were just great. Good communication from Peter, his office, and the workers throughout the project. Peter was the only contractor of five that I enlisted that said I should have a permit for my windows from the city of Arvada. All the others said it was not necessary. Peter mentioned the cost was minimal to do this, but it gave me an extra layer of security that they did the project right. Anymore, if you don't pull city municipalities permit for your project it could come back later as a nightmare when you go to sell the home. The new buyers will require that you document this.

    Donald A.
  • Prompt, professional. Quality product. Following through and follow up was excellent. They made a good presentation and made good recommendations. I had a proposal from them within 24 hours of meeting with them. Product and installation was everything they promised. They provided me with samples and lots of references to contact.

    Frank W.
  • Very happy with our new windows. The installation was particularly excellent--good clean-up, professional service, with little time. I wish the windows were cheaper, but these are not more expensive than the competition. I am getting more windows installed from Lifetime thanks to their good work.

    R. J. Z.
  • We had a great experience with Lifetime Windows! The windows were priced far more competitively than other window companies and the quality and warranty behind the windows are top notch. Peter and his crew were friendly, professional and prompt. The windows look great; they handled the lead paint situation with no problems, and finished the job on time. Highly recommended!!

  • Lifetime sold and installed new windows for our home. What was cool about them is that they were honest upfront. We called a few other companies and they gave us really weird pricing options. Lifetime just came back with a price that was fair and honest.

    Tom M.
  • Lifetime Windows replaced the exterior windows on our home about 1 month ago. This last week we had our first cold spell and the first real test for the work they performed. It was an amazing change! Our heater was barely on with the gauge reading only 1 lbs of extra propane over our trend. If those savings hold up we are looking at recovering the price of the windows in a little less than 2 years.

    Robert T.
  • We recently bought a 100 year old house and needed new windows. Jason and his crew are the best! They are professional and polite. They do not put any pressure on their customers. Clean up well after the installation. And they came back to make sure every single window was install correctly, TWICE! Highly recommended!

    C.C. Liang
  • We have ordered window before (from another vendor) and it definitely was not as easy as LIFETIME. Peter came to the house and gave us the best estimate that anyone had to offer. He provided options and gave us his best recommendation. He literally was at the house for 75% of the installation and made sure that every detail was met.

    In today's economy, LIFETIME is the way to go. On time, on budget! Don't go anywhere else.

    (FYI... we had 10+ windows)

    Brian G.
  • Offers



    Send to a Friend

    Recommend this listing to a friend: