When Centennial Home Improvements Inc. started business in 1995, we originally planned on offering homeowners services in all exterior home improvements. After two years we realized, that in order to better serve our customers, we should focus on one trade rather than diversify. We didn't change our name, but we were now a Denver window company.
After doing much research, and looking at many different windows from manufacturers all over the country, we realized that regardless how good a window may be, if it's being installed a mile high, then it must be built a mile high. Unlike most Denver window companies that offer several choices of windows to homeowners, we supply and install only one brand.
After doing much research, and looking at many different windows from manufacturers all over the country, we realized that regardless how good a window may be, if it's being installed a mile high, then it must be built a mile high. Unlike most Denver window companies that offer several choices of windows to homeowners, we supply and install only one brand.
Services
We have been proudly serving the Denver Metro Area with thousands of Amerimax Vinyl Windows installed in Arvada, Aurora, Boulder, Broomfield, Castle Rock, Centennial, Englewood, Highlands Ranch, Lakewood, Littleton, Louisville, Northglen, Parker, Thornton and Westminster. With an A+ rating and a GOLD STAR Award from the Denver Better Business Bureau every year since it's inception in 2003 we believe we are your Denver Window experts.
If you are planning on replacing your windows in Denver Colorado it may seem like a very confusing process. Many people are more confused after they have had several replacement window estimates then they were before they started. Most companies have exclusivity on the window they are selling, so you as a consumer cannot comparison shop.
An insulating glass unit is a flexible pressure chamber. It contains the pressure of the elevation that was in the manufacturing plant at the moment the unit was sealed. So, a Colorado replacement window should be manufactured at a suitable Colorado altitude.
When the glass is sealed at a low altitude and then installed at a higher altitude, such as Denver, the resulting increase in altitude causes the glass panes to bow out or take on a pillow shape appearance.If the pressure change is large, the insulating glass panes can fracture, and the sealant holding the glass panes can rupture causing premature seal failure.
When the glass is sealed at a low altitude and then installed at a higher altitude, such as Denver, the resulting increase in altitude causes the glass panes to bow out or take on a pillow shape appearance.If the pressure change is large, the insulating glass panes can fracture, and the sealant holding the glass panes can rupture causing premature seal failure.
Extreme temperature changes can cause tremendous pressure on the insulating glass unit (IGU) in your window. Every one degree Fahrenheit (F) change in the temperature produces a 3.6 PSF pressure change. While this seems slight, a 20 degree F change would equal the pressure of a 175 MPH wind. When we have temperature swings of 20 degrees within a 24 hour period (which happens every day in Colorado) an insulating glass unit is in constant motion.
Reviews (16)
Nancy Dilatush
Dec 22, 2021
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I would highly recommend 303 Windows because of service, price and Jay's vision. When I asked for a quote, it was for 4 bedroom windows, very straight forward. Jay saw the large picture window and sliding glass door in my living room and he made a suggestion. Needless to say, I took his advice and the large picture window looks better than I imagined it could.
I'm very happy with the windows, the installation (installer was great) and Jay's vision!
I'm very happy with the windows, the installation (installer was great) and Jay's vision!
Donna Lefferdo
Oct 28, 2021
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I used 303 Windows to replace some of my old inefficient windows in my house and install their white vinyl windows. Jay Lillien came out to do an estimate. I’m amazed at how affordable these windows are compared to other companies. He was very helpful and knowledgeable of the style to fit my house and design. The installation team was very professional and did a beautiful job. I’m so pleased that I’m having them finish the rest of the windows in the house! These windows are so energy efficient and attractive. I love my new kitchen view, family room view and the rain glass in the bathroom
Andria White
Aug 23, 2021
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I recently had windows installed by 303 Windows I was extremely impressed! I purchased the windows from Jay who answered all my questions he was very knowledgeable, professional with a fun personality! The quality of windows was great. The installers were efficient, polite and neat! I love my new windows I’d highly recommend 303 Windows!
Dave Irish
Aug 04, 2021
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Last year I had 20 windows and a patio door replaced by 303Windows. Jay was great in arranging everything and his experienced crew did it in one day leaving no trace behind but fantastic new windows. I waited to review them until I had a whole year of use. My Xcel bills are way down, the home is much more comfortable, and the noise reduction was dramatic. The price was a fraction of the large corporate window replacement companies that you see adds for every 30 seconds. Don’t waste your time and money and just go ahead with 303Windows!
David S.
Jul 29, 2021
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I highly recommend 303 Windows and owner Jay Lillien.
In early 2021, We had Jay and his team at 303 windows replace all windows in our home in Littleton with Amerimax replacement windows (manufactured in Loveland). We are very pleased with the results. We are exceptionally pleased with the professionalism, friendliness, responsiveness and workmanship of the crew, who swapped out all 27 or so windows over two days, and cleaned up all debris. We had a couple minor problems with the windows (a long narrow eyebrow window cracked during a difficult installation, and a few windows had minor manufacturing
In early 2021, We had Jay and his team at 303 windows replace all windows in our home in Littleton with Amerimax replacement windows (manufactured in Loveland). We are very pleased with the results. We are exceptionally pleased with the professionalism, friendliness, responsiveness and workmanship of the crew, who swapped out all 27 or so windows over two days, and cleaned up all debris. We had a couple minor problems with the windows (a long narrow eyebrow window cracked during a difficult installation, and a few windows had minor manufacturing
Diana Barlow
Jul 08, 2021
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WOW - I sincerely want to thank Jay and his crew for a job very well done. Our windows were a particularly difficult size (as in HUGE) and had multiple issues (bowing in the wind for example - as well as WAY too much heat coming through.) There were window replacement companies we interviewed that would not take the job. There were others that did not listen to our concerns. Jay agreed to take on the job, listened to our concerns, and called into the window manufacturer to obtain advice when needed, without speculating when he wasn't sure of the best solution. We REALLY appreciated that kind of
Teri S.
Jun 15, 2021
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Positive: Professionalism, Punctuality, Quality, Responsiveness
We got bids from other window replacement companies. Not only did 303Windows have the best price but owner Jay’s sales approach was low pressure and honest. I prefer working with a small business with a responsive owner. We had all our windows replaced in 2 days by a professional hard-working team. I highly recommend them.
Service: Window installation
We got bids from other window replacement companies. Not only did 303Windows have the best price but owner Jay’s sales approach was low pressure and honest. I prefer working with a small business with a responsive owner. We had all our windows replaced in 2 days by a professional hard-working team. I highly recommend them.
Service: Window installation
Wendy G.
May 31, 2021
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We had a broken glass patio door, and Jay was able to have his team replace it within less than half the time of any other place we called. The work was done extremely well. The new door is beautiful. Perhaps most pleasing about it is that it was also the most reasonably priced. There is no question we would use them again when we replace the windows in our home. Highly recommend them!
H. Benkelman
Feb 04, 2021
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I had several bids from local 5 star companies...all selling Amerimax windows so they were all comparable products. The difference between 303 and other companies were...1) Jays customer service and honesty...he explained the process clearly and completely. 2) once the windows were installed, they were done...meaning the installers finished with caulk and paint. BE SIRE TO ASK THIS QUESTION. a comparable installer gave me a price lower than 303 but I had to finish with paint touch ups. That wasn’t going to work for me because my windows on on a second floor. 3) the Installers were top notch.
John J.
Jan 18, 2021
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I'm a home owner in the Denver metro area and shopped around when looking for replacement windows but was totally turned off by the selling techniques of all the window companies. My house is pretty old and had metal framed windows, single pane with bid metal framing on the inside. I knew it wasn't going to be an easy window project and trust me, the other companies I entertained made it sound like a huge cost factor to change this out. When I reached out to Jay at 303 Windows it was like a breath of fresh air. They were very familiar with the type of house and windows, answered all my
Ciao Line
Aug 24, 2020
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Don't hesitate, call now! Over the past seven years we replaced all of our windows. We did this in thirds: The first and second time we went through Discount Windows and Siding. This is when they were discount windows. Since then their prices tripled which prompted us to shop around, obtaining estimates from four more window companies. Enter Jay from 303 Windows. What a breath of fresh air! From the first call Jay was prompt, professional, courteous, VERY KNOWLEDGEABLE, reasonable, observant, and keen on details (he was the only window man in seven years who pointed out that
Lisa C.
Jul 14, 2020
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I couldn't be happier with the work done by 303 Windows. We had originally contacted a larger retailer who quoted us thousands more, and we were going to have to make sacrifices in terms of style.
I'm so glad I contacted 303 Windows. We got custom windows for way less.
Jay was always so responsive and professional. And the installers were on time, did a great job, and were in and out in no time!
If you need windows in the Denver area, do yourself a favor and contact Jay with 303 Windows. You won't be disappointed! :)
I'm so glad I contacted 303 Windows. We got custom windows for way less.
Jay was always so responsive and professional. And the installers were on time, did a great job, and were in and out in no time!
If you need windows in the Denver area, do yourself a favor and contact Jay with 303 Windows. You won't be disappointed! :)
John S.
Nov 03, 2018
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I generally don't write reviews, but in this case if I could give more than five stars, I would.
At a time in Denver when uncertain quality and dubious performance command a towering price 303-WINDOWS was a model of professionalism, craftsmanship, and customer service.
I replaced 19 windows at my home in November 2018. Jay explained everything in easy to understand terms without a hint of sales pressure. He provided me timely and complete information in response to questions from my HOA.
The impressive crew (Rick, John, Mark, and Adrian) was capable, efficient and thorough. They consistently
At a time in Denver when uncertain quality and dubious performance command a towering price 303-WINDOWS was a model of professionalism, craftsmanship, and customer service.
I replaced 19 windows at my home in November 2018. Jay explained everything in easy to understand terms without a hint of sales pressure. He provided me timely and complete information in response to questions from my HOA.
The impressive crew (Rick, John, Mark, and Adrian) was capable, efficient and thorough. They consistently
Andrew S.
Jan 04, 2018
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I.-Pin W.
May 25, 2017
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I was in the market to have 6 windows replaced originally because I thought that's what I could have afforded with my budget. Jay was the second person I called to get a bid and his bid was much lower than the first company I contacted so I added two more windows. He explained to me that since he's the owner himself, he was able to give me a much better price without the salesperson. His bid for 8 windows total was still lower than the first bid I got and those are for the exact same models so I knew it was comparing apples to apples. On top of the honest and very competitive pricing
J. K.
May 25, 2017
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In today's society, it's hard to find honest, respectful, hardworking individuals that take pride in their work and offer a great customer experience. Before I called 303-WINDOWS, I was very skeptical thinking this would be another "buyer beware" sort of experience full of surprises and unpleasntries. It never fails, whenever I need something done to my home, car, etc., honesty and integrity seems to take a back seat with whoever I hire. Within minutes of talking to Jay (the owner), he put me at ease and was very pleasant to talk with on the phone. I needed an estimate and
