Milgard C650 Series | Phoenix Certified Milgard Dealer

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K & J Windows, LLC | Milgard C650 Ultra Series

Single-Hung

K & J Windows, LLC | Milgard C650 Ultra Series

Casement

K & J Windows, LLC | Milgard C650 Ultra Series

Awning

K & J Windows, LLC | Milgard C650 Ultra Series

Bay & Bow

K & J Windows, LLC | Milgard C650 Ultra Series

Radius Windows

K & J Windows, LLC | Milgard C650 Ultra Series

Sliding Glass

K & J Windows, LLC | Milgard C650 Ultra Series

Swinging Patio

K & J Windows, LLC | Milgard C650 Ultra Series
K & J Windows, LLC | Milgard C650 Ultra Series

Energy Efficiency

Fiberglass windows excel in energy efficiency due to their resistance to expansion and contraction with changing weather conditions. This feature makes them an excellent option for homes located in areas with extreme temperatures, ensuring consistent performance regardless of the climate.

K & J Windows, LLC | Milgard C650 Ultra Series

Color Options

These fiberglass windows, available in four exterior colors – Black Bean, Bark, Harmony, and Frost – are designed to complement any architectural style. Choose from a color-matched interior or classic white.

K & J Windows, LLC | Milgard C650 Ultra Series

Aesthetic Accessories

The C650 Series windows feature a diverse range of grid types, patterns, and combinations, ensuring a perfect match for your home’s style.

Do Vinyl Windows Hold Up in Arizona?

Beautiful Hardware

Discover the pinnacle of luxury with the Ultra C650 Series fiberglass windows, a definitive statement piece for any home. Offering four stunning color options for both interior and exterior frames, this series boasts exclusivity in design. With its unique hardware and five durable color finishes, these windows ensure both aesthetics and security while providing seamless operation.

Crafted from resilient fiberglass material, the Ultra C650 Series stands strong against extreme temperatures, preventing issues like swelling, rotting, or warping. This makes it the ultimate choice for hassle-free maintenance and long-term durability, regardless of the climate. Featuring elegant French-style sliding or swing patio doors with up to four panels, it’s perfect for enhancing outdoor spaces and maximizing scenic views.

For those seeking enduring quality and striking visual appeal, look no further than the Ultra C650 Series for your windows and doors needs.

Inspiration Photos

WHAT OUR CUSTOMERS ARE SAYING

After more than 10 years in the Windows and Door industry, we've found that our customers describe us the best.

Excellent
4.6
K & J Windows, LLC | Milgard C650 Ultra Series
Jen Benson
2 months ago
The process of getting 4 new windows was so easy and efficient with K & J windows! Everyone I spoke with through the process was friendly and professional, especially our installer Joseff.
K & J Windows, LLC | Milgard C650 Ultra Series
Pam Gro
2 months ago
K & J is the best. I've never had better customer service from any company. They're the whole package - friendly, knowledgeable, professional...just all around an excellent experience every time.
K & J Windows, LLC | Milgard C650 Ultra Series
Courtney Collins
3 months ago
I finally replaced the original 1980s windows in my home, and I am so glad I chose K&J. It actually took me two years and countless quotes from different companies to make this decision, but looking back, I’m so happy I took my time—it led me to the best possible choice. ​What really stood out to me was the level of care. I’m pretty particular about the technical details—especially since my windows face North and South—but Kevyn, the K in K&J, was incredible. She spent so much time going back and forth with me, answering every single question, and was always incredibly responsive. ​The installation process was just as impressive. The installers came within the appointment window, were very nice and respectable of my home. They used drop cloths and made sure they cleaned up everything. It also felt like a true family effort; Jake, the J in K&J, came out to check on the installation to make sure I was happy with everything, and even Darin, the original founder of the company, stopped by. You can tell this business truly means something to them. It didn't feel like I was just another 'job'—it felt like they genuinely cared about their work and the legacy of their business. As someone who was born and raised in Phoenix , whose father also owns his own business here, the best choice is going local. They offer a wide range of options to fit any budget or goal. I chose a mid-range product, and the investment was well worth it to support a local business and receive exceptional quality. I’m thrilled with the results; the windows look fantastic, and I’ve already noticed a significant improvement in my home's comfort. If you want a team that takes pride in their work and treats you like family, I highly recommend K&J.
K & J Windows, LLC | Milgard C650 Ultra Series
Greg Lawrence
4 months ago
We've use K&J windows for our last 3 houses and we couldn't be happier. Not only do they provide a competitive price, but they are extremely customer focused on ensuring the outcome is great. They walked us through every step of the process, accommodated our needs for scheduling the work, and we couldn't be happier with how the windows/stucco turned out.
K & J Windows, LLC | Milgard C650 Ultra Series
Mark Stone
4 months ago
While the timeline was longer than promised, the team recovered and provided excellent and quality work on our windows and doors! Hiccups will occur, it's how a company recovers. A shout out to Rodney who was instrumental shoring everything up and Brandon in the home office. We love supporting locally owned companies and Kevyn & Jack (K & J) took ownership for sure. I would absolutely recommend K & J Windows!
K & J Windows, LLC | Milgard C650 Ultra Series
Kathy Carr
5 months ago
K & J Windows did an excellent job with my recent window installation. From start to finish, the team was responsive, professional, and easy to work with. As with any project, there were a few follow-up items after installation, but what really stood out was their commitment to making everything right. They stayed engaged, communicated clearly, and ensured all issues were resolved promptly. The owner even came out personally to inspect the work and make final adjustments, which I really appreciated. I love my new windows — they’ve made a noticeable difference in both comfort and appearance. It’s clear this is a family-owned business that takes pride in their work and stands behind their product. I would absolutely recommend K & J Windows.
Response from the owner:Thank you so much, Kathy, for your thoughtful review and for choosing K&J Windows! We’re thrilled to hear you had a great experience with your window installation from start to finish. Our goal is to make every window replacement project as smooth and stress-free as possible, and we truly appreciate you recognizing our team’s communication, responsiveness, and attention to detail. We’re especially glad the follow-up process stood out to you. Standing behind our work is a big part of who we are, and ensuring every vinyl window installation and replacement meets our standards—and yours—is always a top priority. We’re happy our owner could personally assist and make sure everything was perfect. Most importantly, we love hearing that your new windows have improved your home’s comfort and appearance—that’s exactly what quality window replacement should deliver! Thank you again for your recommendation—we’re always here if you need anything in the future.
K & J Windows, LLC | Milgard C650 Ultra Series
margaret wilcox
6 months ago
If you need house windows K&J windows are the best--both quality and attention to detail!! Without them taking on SRP we would NEVER have received our $1000.00 rebate check!!! So happy with everything they did!!
Response from the owner:Thank you so much, Margaret, for your kind words and for trusting K&J Windows! We’re thrilled to hear you’re happy with your new house windows and that our team’s attention to detail made a difference throughout your window installation. Helping our customers navigate programs like SRP rebates is all part of delivering a complete, stress-free window replacement experience, so we’re especially glad we could help you secure your $1,000 rebate! It means a lot to know you’re satisfied with the quality of your vinyl window installation and replacement and custom windows. We truly appreciate your support and are always here if you need anything in the future.
K & J Windows, LLC | Milgard C650 Ultra Series
Dennis Miller
6 months ago
Agree wholeheartedly with all the previous positive reviews. These guys are really that good!
Response from the owner:Thank you, Dennis, for the great feedback and for trusting K&J Windows! We truly appreciate you echoing the positive experiences of other homeowners—it means a lot to our team. Delivering high-quality window installation and reliable window replacement services is what we strive for on every project. We’re glad you had a great experience with your vinyl window installation and replacement, and we’re always here if you need anything in the future. Thanks again for your support!
K & J Windows, LLC | Milgard C650 Ultra Series
Michael Clare
6 months ago
Nearly ten years ago, I contracted with K & J Windows to replace all of the windows and the sliding glass door in my home. To this day, I know I made the right decision to choose this company and have them use Simonton Windows. I remember reading a blog post which stated the importance of using a window contractor who knows how to properly do the installation. The K & J installation team was stupendous from start to finish. Equally important is the warranty. Some of the windows needed minor adjustments about two years ago, so I called K & J, and they sent out a company which Simonton uses for this purpose; this third party did a great job with the follow up and the tune up. The Simonton screen door stopped working correctly a few weeks ago, so I again called K & J, and they contacted a coordinator who in turn provided a new screen door from Simonton and then hired a company to do the installation of the new screen door. The repair company did a great job. Everything was under full warranty. Folks, you’ll be very satisfied and safe going with K & J Windows. They truly care about the product they sell, well beyond their initial installation.
Response from the owner:Thank you so much, Michael, for your incredible and detailed review—and for trusting K&J Windows for nearly a decade! We’re thrilled to hear that your window replacement and sliding glass door installation have continued to perform over the years. Proper window installation truly makes all the difference, and it means a lot to know our team delivered that level of quality from day one. We also appreciate you highlighting the importance of warranty and long-term support. Ensuring our customers are taken care of well beyond the initial vinyl window installation and replacement is a top priority, and we’re glad we could assist with your Simonton windows and screen door replacements seamlessly. Your feedback speaks to exactly what we strive for—reliable products, expert installation, and continued support years down the road. Thank you again for your trust and recommendation. We’re always here whenever you need us!
K & J Windows, LLC | Milgard C650 Ultra Series
Penny Beiler
6 months ago
Recently I decided to upgrade my windows for better efficiency. Mine were original to my house. After reviewing people’s comments on line I decided to call K & J Windows. I was very fortunate to find this family owned company. Reading their reviews intrigued me. I called and not only did they take my call but sent someone to my house the next day to measure and give me a quote. The representative was knowledgeable and answered all my questions. I had a good feeling because of their customer service. This continued throughout the entire process! If you need a quality company with extra extraordinary customer service, I highly recommend them. My new windows are beautiful and efficient. I no longer feel extreme heat when I hold my hand up to the window.
Response from the owner:Thank you so much, Penny, for your thoughtful review and for choosing K&J Windows! We’re thrilled to hear you had such a positive experience from the very first call through the final window installation. Providing responsive, knowledgeable service and making the window replacement process smooth and stress-free is exactly what we aim for. It’s especially great to hear your new windows are making a noticeable difference in comfort and energy efficiency—that’s one of the biggest benefits of a quality vinyl window installation and replacement. No more extreme heat coming through your windows is a win! We truly appreciate your recommendation and are grateful you trusted our family-owned team. If you ever need anything in the future, we’re always here to help.
K & J Windows, LLC | Milgard C650 Ultra Series
Matt Miceli
7 months ago
Response from the owner:Thank you, Matt, for the 5-star rating and for choosing K&J Windows! We’re glad you trusted us with your vinyl window installation and replacement and truly appreciate your support. Providing high-quality window replacement and professional window installation is what we’re all about. If you ever need anything in the future, we’re always here to help. Thanks again!
K & J Windows, LLC | Milgard C650 Ultra Series
Paul Larsen
10 months ago
We did the whole house and they were fantastic! The demo of the old windows and install of the new ones took only a day. They cleaned up very well when they were done and made sure we were happy. I asked them to come back a week later and check on something, and they did! They were just great. They stand by their product and your satisfaction is their top priority. They were recommend by two other people I know and I am glad I went with them. Their pricing was good and their installation fee was totally in line with having 4-5 people working at once. Glad I went with them.
Response from the owner:Thank you so much, Paul, for your detailed review and for trusting K&J Windows with your full window replacement project! We’re thrilled to hear everything—from the demo to the window installation—was completed efficiently and to your satisfaction. Our team works hard to keep projects on schedule while maintaining a clean workspace and high-quality results, so your feedback means a lot. We also appreciate you mentioning our follow-up service. Standing behind our work and making sure every detail is right—even after the job is done—is a big part of what we believe great vinyl window installation and replacement should include. Thank you again for your trust, your referrals, and your kind words about our pricing and team. We’re always here if you need anything in the future!
K & J Windows, LLC | Milgard C650 Ultra Series
Dhruv Gaur
12 months ago
K&J Windows was fantastic from start to finish. The quoting process was clear, installation was right on schedule, and the team was professional—quick, efficient, and cleaned up perfectly. The owner personally answered all my questions, and when a small cosmetic issue came up (the windows themselves worked perfectly), they listened and sent someone out promptly to fix it, no hassle at all. It’s rare to find a company that cares so much about the entire experience—and their price was the best around. Highly recommend them and would hire again with zero hesitation.
Response from the owner:Thank you so much, Dhruv! We’re thrilled to hear that your experience with K&J Windows—from the quoting process to installation—was smooth and professional. Our team takes pride in providing clear communication, quality craftsmanship, and prompt service for every customer. We’re glad we could quickly resolve the minor issue and that you’re happy with your new windows! Enjoy your upgraded home, and thank you for recommending K&J Windows!
K & J Windows, LLC | Milgard C650 Ultra Series
Josh OConnor
1 year ago
K&J windows did a great job quoting and measuring for a new fiberglass double entry door. Shawn was a great point of contact walking me through the options, install process, and coordinating the quotes. Maxwell came out to measure for the install - he answered all of my questions with professionalism and arrived promptly. I ultimately went another route due to my narrow timeframe for getting the job done (my own fault), but I wanted to leave a glowing review for the K&J team - they will take great care of you!
Response from the owner:Thank you so much for the kind words, Josh! We’re glad Shawn and Maxwell could provide you with a smooth and professional experience. We completely understand about timing, and we appreciate you considering K&J Windows. Whenever you’re ready, we’ll be here to take great care of you!
K & J Windows, LLC | Milgard C650 Ultra Series
Cassandra Smith
1 year ago
We had an excellent experience with getting a new front door installed this past spring! Our old door was not a standard size and other folks I had out for quotes weren't nearly as knowledgeable and helpful as our K&J salesman Tony Liethen. He really took his time at our initial appointment to make sure they'd be able to help us out, and it did take the installers probably a good deal longer than normal due to this very old house and door. Even though the install took quite a while, there was no additional cost or quote adjustment after the first quote. The installers did forget one screw and forgot to adjust the threshold, but K&J sent someone right out to get those things tidied up for us and were very professional and nice about all of it! Thank you so much for helping these new homeowners and for your patience and professionalism!
Response from the owner:Thank you so much, Cassandra! We’re thrilled to hear Tony and the team could support you through your unique installation. We appreciate your patience with the extra time needed and are glad we could quickly resolve the final details. Congratulations again on your new home—thank you for trusting K&J Windows to be part of your journey!
K & J Windows, LLC | Milgard C650 Ultra Series
Cindy S
2 years ago
K&J just replaced a sliding door and bedroom window at my 1980 condo. They were very patient as I awaited approval from my HOA. The installation process was great, Abel Misa and Ivan were fantastic. There was a problem with the slider, but they were able to figure out a solution. Very pleased with this entire purchase and installation.
Response from the owner:Thank you, Cindy! We’re so happy to hear Abel and Ivan provided fantastic service and that the installation went smoothly despite the challenges. We appreciate your patience throughout the HOA approval process and are glad you’re pleased with your new door and window!
K & J Windows, LLC | Milgard C650 Ultra Series
James W.
2 years ago
We purchased replacement window from K & J for our entire home. Very impressed with the installers, Misa and Ivan. Polite, kind & courteous, couldnt have...
K & J Windows, LLC | Milgard C650 Ultra Series
Marcus S
2 years ago
We bought replacement windows from K&J for our entire home. There was some issues along the way but K&J and the owner Darin went out of their way to make things right and the company has a lot of integrity, i would trust them and do business again in the future. They have good people at the top.
Response from the owner:Thank you, Marcus! We truly appreciate your honest feedback and your trust in K&J Windows. Darin and the whole team are committed to making things right and providing the best service possible. We look forward to working with you again whenever you need us!
K & J Windows, LLC | Milgard C650 Ultra Series
Marcus L.
2 years ago
We bought replacement windows from K&J for our entire home. There was some issues along the way but K&J and the owner Darin went out of their way to make...
K & J Windows, LLC | Milgard C650 Ultra Series
Cathy M.
2 years ago
Sliding glass door replacement. Good quality. Professional. Prompt. Fair price. Sales person, Cody, was a pleasure to work with.
K & J Windows, LLC | Milgard C650 Ultra Series
Dwayne Gibson
2 years ago
I bought windows from K&J 5 years ago. One of the window panes broke. K&J worked with the manufacturer to provide a replacement that took only 5 minutes to change out. Thanks to Yolanda for all her help in getting this arranged!!! Keep up the good work!!!
Response from the owner:Thank you, Dwayne! We’re glad we could quickly get your window pane replaced and that our team made the process easy for you. We appreciate your continued trust in K&J Windows—thanks for the kind words and support!
K & J Windows, LLC | Milgard C650 Ultra Series
Sean K.
2 years ago
Reached out to them online for a window repair on Sunday afternoon. Got a call back Monday morning. After discussing the problem, they let me know it wasn't...
K & J Windows, LLC | Milgard C650 Ultra Series
Victor Gonzalez
2 years ago
Response from the owner:Thank you for your kind words! It was a pleasure working with you on your window replacement project. We’re happy you’re enjoying the results — clear views and improved comfort make all the difference!
K & J Windows, LLC | Milgard C650 Ultra Series
Sheryl T
2 years ago
K&J did a good job installing our new French patio door . They were very helpful with the choosing of the details to fit what we were looking to include in the design. K&J were very quick to solve any problems that came up, very happy with this company.
Response from the owner:Thank you so much, Sheryl! We're thrilled to hear that you love your new French patio door and that our team was able to help you find the perfect design. We always strive to make the process smooth and enjoyable, and we appreciate your kind words about our quick problem-solving. Enjoy your new door, and thank you for choosing K&J Windows!
K & J Windows, LLC | Milgard C650 Ultra Series
Molly Cerniglia
2 years ago
Just had new windows installed today by K&J windows. I loved the whole experience. The salesman (Cody) was so knowledgeable about our 1970’s slump block house. The install crew was so great! They were knowledgeable, problem solvers, communicated well, polite, and super detail oriented. They spent the last 4 hours sealing the outside and inside of the windows (then cleaning up completely) after they were installed. Super impressed.
Response from the owner:Thank you so much, Molly! We’re thrilled to hear Cody and the install crew provided such a knowledgeable and detailed experience for your 1970’s slump block home. We pride ourselves on quality and communication, so it’s great to know it made such a positive impression. Enjoy your beautiful new windows!

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You can call us, get a quote online or come in and speak to our certified Milgard dealer today (602) 942-0954