Ultra™ Series Horizontal Slider

Horizontal Slider windows open with the sash sliding left or right.

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Ultra Series fiberglass double horizontal slider
Ultra Series fiberglass double horizontal slider
  • Features
  • Colors
  • Hardware
  • Grids
  • Glass
  • Screens
  • Technical Resources

Ultra Series is a stunning, high performance, fiberglass window that can help you create the home of your dreams. If you are looking for long-lasting durability coupled with exceptional beauty, Ultra Series offers:

  • A fiberglass frame that resists swelling, rotting, and warping for durability you can count on
  • Attractive window hardware that is durable, secure, and easy to operate
  • An ENERGY STAR® package tailored to your region for an energy efficient home
  • The Milgard Full Lifetime Warranty, including Glass Breakage Coverage
Preview Interior Frame in White with any exterior color
Preview Interior Frame in Harmony with Harmony exterior only
Preview Interior Frame in Bark with Bark exterior only
Preview Interior Frame in Black Bean with Black Bean exterior only
Preview Exterior Frame in Frost
Preview Exterior Frame in Harmony
Preview Exterior Frame in Bark
Preview Exterior Frame in Black Bean
Preview Exterior Frame in Sand
Preview Exterior Frame in Fern
Preview Exterior Frame in Cinnamon
White with any exterior color
Harmony with Harmony exterior only
Bark with Bark exterior only
Black Bean with Black Bean exterior only
Black Bean
Preview Hardware item in Positive Action® Lock
Preview Hardware item in Cam Lock (optional)
Preview Hardware item in Sash Pull (only available with Cam Lock)
Positive Action® Lock
Cam Lock (optional)
Sash Pull (only available with Cam Lock)

Horizontal sliding windows come with the Positive Action® lock standard. Cam lock and sash pull available as an option.


Window Hardware finishes:

White - Clay - Dark Bronze - Brushed Chrome - Black

Preview Grid item in Flat Grid (inside glass)
Preview Grid item in Sculptured Grid (inside glass)
Preview Grid item in 3/4" Vintage SDL
Preview Grid item in 1-1/8" Vintage SDL
Preview Grid item in 1-1/8" Craftsman SDL
Preview Grid item in 1-1/8" Legacy SDL
Flat Grid (inside glass)
Sculptured Grid (inside glass)
3/4" Vintage SDL
1-1/8" Vintage SDL
1-1/8" Craftsman SDL
1-1/8" Legacy SDL

Grids are shown from the interior.

Preview obscure Glass in Aquatex
Preview obscure Glass in Clear 42
Preview obscure Glass in Cross Reed
Preview obscure Glass in Delta Frost
Preview obscure Glass in Frosted Glue Chip
Preview obscure Glass in Glue Chip
Preview obscure Glass in Matelux
Preview obscure Glass in Narrow Reed
Preview obscure Glass in P516
Preview obscure Glass in Rain
Preview tinted Glass in Azurelite
Preview tinted Glass in Cardinal Low-E
Preview tinted Glass in Evergreen
Preview tinted Glass in Solar Bronze
Preview tinted Glass in Solar Gray
Clear 42
Cross Reed
Delta Frost
Frosted Glue Chip
Glue Chip
Narrow Reed
Cardinal Low-E
Solar Bronze
Solar Gray
Preview Screen item in Standard Mesh
Preview Screen item in PureView® Mesh
Standard Mesh
PureView® Mesh

Learn more about our exclusive PureView® screens.

Technical Resources

Ultra™ Series Horizontal Slider Technical Resources

You can also search our full Technical Resource Library for more Product Series and Operating Styles.

AAMA 2400-10 Installation Instructions
File type(s):
Installation Instructions
AAMA 2410-13 Installation Instructions
File type(s):
Installation Instructions
Installation Supplement
File type(s):
Installation Instructions
Stucco Tape Guidelines
File type(s):
Installation Instructions
Ultra Series 3 Part Specifications
File type(s):
Technical Documents
Ultra™ Series Performance Ratings
File type(s):
Ratings Data
Ultra™ Series STC Ratings
File type(s):
Ratings Data


Ultra™ Series Horizontal Slider

See All Reviews
Ultra™ Series Horizontal Slider is rated 3.7 out of 5 by 158.
Rated 5 out of 5 by from best of today's world These Fiberglass windows are very nice ,the Finnish is nicer than a vinyl window as it do-sent hold the smudges and dirt the same , the frames are wonderfully built the ,screens are great the mechanisms work flawlessly . real impressed with the build quality and seams too . well worth the 2 months they took to make them.
Date published: 2017-12-17
Rated 1 out of 5 by from Milgard customer service and warranty is HORRIFIC! I have been waiting since Aug. for a window that Milgard supplied that was warped and it's now Dec. and once again Milgard failed to show for their scheduled time to replace it! Milgard has scheduled three appointments since Aug. and each time they were a no show. I have taken time off from work twice to be here for their scheduled appointment and again they are consistently a no show. When I call Milgard to inquire they tell me they are sorry and reschedule for another date which is always 3-4 weeks out!
Date published: 2017-12-10
Rated 5 out of 5 by from great looking doors We are very pleased with our doors and ease of use. The side vented windows are wonderful to get fresh air without having to open doors to outside. Really enjoy our choice, even though we ended up spending a little more than we had planned, it was worth it.
Date published: 2017-12-10
Rated 5 out of 5 by from Wonderful communication, from purchase to delivery Suggest a wider (or second) handle on single-hung windows' lower sash, especially for larger units. The current 3' handle barely accommodates my four fingers, and while I'm fit (for an older guy), it's a struggle. By extension, closing the window is equally problematic. As the small handle doesn't lend itself to a downward pull, one must be able to reach the upper rail to lower the window, a motion all the more challenging with a unit requiring one to lean, such as over a 2' deep kitchen counter.
Date published: 2017-12-08
Rated 4 out of 5 by from Film on window I only have one complaint about the windows-there is a film on the window that I can't get off! I've cleaned them 3 times and the installer cleaned them. Not all the windows have this film only a few.
Date published: 2017-12-02
Rated 5 out of 5 by from Overall I am very satisfied. The promised lead time from ordering to delivery was extended twice. My dealer was good about relaying the delay news from the factory. Product was very good; waiting was frustrating.
Date published: 2017-12-02
Rated 4 out of 5 by from nice to look at My slider is beautiful! Everyone that sees it loves it (even people we do not know). It is very solid and works wonderfully. I only have one issue with this purchase. The screen door. We paid thousands for the door and get a $2 screen slider that works like garbage and looks super cheap. Yes, I know it is a screen door, but for the amount paid and the great product of the door it's self, you would think that they would put that in all that they do. This is why I did not give them a 5 star rating
Date published: 2017-11-25
Rated 4 out of 5 by from This product is great. We are vey happy with the entire process. We will wait and see if there are future issue.
Date published: 2017-11-18
Rated 5 out of 5 by from My replacement windows are vinyl I couldn't make the changes to my warranty details. Please make that change for me to vinyl windows. I love the windows. My contractor did a great job installing them in my 60-year-old house.
Date published: 2017-11-09
Rated 2 out of 5 by from Fallen short of meeting minimum expectations Dealing with Milgard has been nothing but a hassle. Manufacturing errors and mistakes on their end are not taken seriously, and are not followed up. We went with Milgard because we believed they offered an excellent warranty program, but they have fallen far short of meeting minimum expectations. In March and November of 2017 I purchased all new windows for my home. I opted to install Milgard fiberglass ultra windows. Overall I'm happy with the windows themselves, but where there have been problems, there are PROBLEMS. For example, two casement windows which were bark (dark brown) on the inside and out, were shipped with white framed screens, which looked terrible! It took over a year and multiple phone calls to get it right. It is amazing - you can talk to one person they tell you they will call you back, they never follow through and when you call back there is no record of your previous conversations! Beyond which, the people you speak to have no idea about the products they carry. At one point someone at Milgard told me that there is no such thing as a window screen with a dark brown frame despite me insisting the horizontal sliding windows I have came with brown screens (the only difference being with the casement windows the screens are more visible because they are mounted inside your home). For the record, they do exist! Three of my windows arrived with significant scratches on the glass. I contacted Milgard before the windows were even installed and they sent out a tech who said he would make a note in my file and return to resolve the issues once the windows were installed. He said he would send touch-up paint to fix the scratches on the frames. I called to have the replacement glass ordered in July of 2016 and was told it would take 6 weeks. When I didn't hear back I called in September to check the status of the glass. First they didn't know what I was talking about. On a subsequent call I was told the glass was already in Victoria but that nobody had called me. A date was scheduled to install the glass. Then someone from Washington called to say that the glass could not be installed until the weather warmed in the spring because the muntin frames for the divided light windows would not adhere in the cold weather. I agreed to wait until spring. In February I received a curt voicemail from someone stating that the glass HAD to be installed because it was in his way and was going to get broken (too bad this hadn't been an issue back in August!). I insisted I wanted to wait until spring as the window in question was one of a series of 5 large (4'x 6') windows along the front of my home and having one window without the muntin frame would have look ridiculous, plus I didn't have confidence they would ever return to reinstall the muntin frame in the warmer weather. In June when I hadn't heard from the installer I called Milgard again to set up an appointment to have the glass replaced. They had no idea what I was talking about and did not know who had the glass. I called a few more times, and spoke to a few more people who were equally appeasing - they would "look into it and call me back", but as per their pattern, nobody ever called. When Milgard finally got their ducks in a row, we had to rent our own scaffolding so the guy could install one of the windows. Another window that was "fixed" looks terrible! The spacer piece between the two panes of glass is not the least bit straight and it is made of a different material from all the other windows in the house (this liner piece is plastic, and the others are metal). Having seen this wobbly "workmanship" we opted to live with scratches in our large 4'x 6' window because the main wall in our livingroom / diningroom is composed of 5 of these large divided light windows (each window is divided into 2 columns of 3) and the window with scratches would have one of the 2x3 segments lined with a light grey plastic spacer when the rest of them had metal. We also didn't want a liner which wasn't straight like the other window which was "fixed". Pretty poor if you ask me.... $20k for windows and you decide that it is better to leave them with the factory scratches!?!?!. The gentleman who replaced the glass stated he was going to call me when he had metal pieces as well as touch-up paint, but that was 4 months ago, so I'm not going to hold my breath.... The touch-up paint I'm still waiting for was promised when the windows were delivered with scratches in early May of 2016. The Milgard representative who came out to see the widows when they were delivered said he would make a note in my file and return once the windows were installed. After that Milgard decided to contract out this work and no note was put in a file. The touch-up paint was supposed to come with the replacement glass, but again no.............. Since then, I have filled out an online request form and left a voicemail message. No surprise I haven't heard back. I would not recommend these windows or any other Milgard product.
Date published: 2017-11-09
Rated 1 out of 5 by from 2 month lead time and damaged Received dented/chipped frame and dirty interior glass - unable to clean interior. Showing factory suction cup marks and scratches on the glass inside and out. If it weren't for the project delays - would have sent them back but had to use them unfortunately. Sucks to pay full price for damaged goods.
Date published: 2017-11-05
Rated 5 out of 5 by from Historically appropriate, beautiful casement windows I am very pleased with new Ultra casement windows. I did months of research into all different brands, materials, and product lines. I found exactly what I wanted in the Ultra windows, and for far less than my only other choice with the same options (top of the line Marvins for nearly double the price). I have an historic 1930s Spanish revival home in California. I was able to get casements in the right configuration and colors for the period. I have a noise issue in the neighborhood too, so I was able to get dissimilar size panes of glass in my windows, which makes the problem no longer noticeable. The tight fit of the casements also keeps it snug and quiet inside. I'm very happy about the lifetime warranty too. No one else offers that in a fiberglass window. Overall I am glad I went with Milgard, for the quality and the value, and the windows match my house's period perfectly.
Date published: 2017-11-04
Rated 4 out of 5 by from In-swing sliding screen feature is inadequate design We love most aspects of our new in-swing, Ultra series French Patio doors except for one thing... the screen. Unlike the useful and good looking retractable screen on the out-swing French doors we ordered at the same time, the in-swing sliding screen never allows use of the entire opening with both doors open. It shouldn't be an option for in-swing doors, unless one door is inactive.
Date published: 2017-11-03
Rated 5 out of 5 by from Milgard is the absolute best! I just had two sets of Milgard sliders installed in my home. This completes a full Milgard home of windows and doors. Obviously I am a huge fan!!
Date published: 2017-10-25
Rated 5 out of 5 by from Wonderful Products We are in the process of replacing all our outdated windows in the upstairs of our home. The windows are of various sizes and all arrived in perfect working order. The hardware works smoothly and is a big change from the products previously installed. We liked the fact that Milgard had a wide range of window styles to choose from and the tint on the glass actually cooled off the upstairs. A real plus!
Date published: 2017-10-01
Rated 1 out of 5 by from Very expensive for the quality of the product not even close to par I've been a glazier for 25 years I worked with all kinds of products namely Pella mercer Cascade Phillips Jeld-Wen gilwin Marvin Anderson and eagle but mostly with Milgard....I can honestly say quality has fallen off the map for Milgard ...... years ago 10-15 years ago they had earned the slogan clearly the best nowadays every time I pick up a shipment or go to install Milgard I Windows and doors all I can think of is CLEARLY A MESS.. unfortunately the general public doesn't know any better because they have not been in the field for very long they don't know that the quality has fallen off since the closure of the Hollister plant. So the household name still sticks but the quality is nowhere near what it used to be I recently purchased a $40,000 order and I have customers that have been waiting 5 months to have the problems rectified it is product problem not an install problem and they fail to follow through with quality so now me as a contractor I have to come up with somewhere between 15 and $17,000 to remove their brand new doors in their brand new home and reinstall a better product I would lean more towards Anderson or eagle for the price because it is comprable in price but there is no comparison in quality. Needless to say I will start moving on to a better product even though lower and products such as Jeld-Wen and Pella vinyl are very low and price but way way better in quality. Another note to be taken years ago you never had to register a Milgard warranty anytime I see a registration card regarding a warranty I think the manufacturer knows that most people won't waste the time to register their warranty therefore it is void years ago you never had to register a warranty Milgard Windows had a lifetime warranty no matter what there is a so number or a birth date on each piece of glass that warranties that piece of glass apparently that no longer is valid even though it still comes with the number you have to register if you don't register you don't get taken care of.
Date published: 2017-08-31
Rated 5 out of 5 by from Ultra is excellent The Ultra windows are definitely a step above vinyl windows. They are much more rigid and solid than vinyl windows, and the appearance alone conveys a sense of sturdiness. There's also more detail on both the interior and exterior of the frame than with vinyl windows I've seen. I am hoping that they will not discolor or warp, which has happened with vinyl windows I've purchased.
Date published: 2017-08-30
Rated 4 out of 5 by from beautiful, but at least 2 of the screens are defective Happy to have casement windows to replace 25 year old wood casements. Very handsome and seem to be well made, but at least 2 of the screens have screening that has come loose along the edge, will need to be replaced.
Date published: 2017-08-17
Rated 5 out of 5 by from Awesome door, high quality For the price, we are happy with the look and feel of the door. Install went smoothly and feels much safer then the old sliding door.
Date published: 2017-08-05
Rated 1 out of 5 by from All the windows have failed within 10 years! The lifetime warranty is not true if you are not the original homeowner! I purchased a very nice upscale home with Milgard windows, and last year I had to have almost half of the windows replaced because the seals had failed. I could see handprints through the windows and the glass changed colors. Unfortunately, if you are not the original homeowner, the windows are only warrantied for 10 years, and I'm not sure why this would matter. This year, I noticed 6 more windows had failed, and since I am out of the 10 year warranty period, I get nothing from Milgard, and have to have a private glass shop replace my windows. I remember the technician who replaced my windows last year told me the windows typically last only 10 years! What a joke. I would not recommend these windows to anyone.
Date published: 2017-08-03
Rated 1 out of 5 by from Irresponsible 8/2/17 My Ultra glass doors are beautiful. I got a swing door with side lites, and a sliding glass door, both custom sized. They insulate well, both temperature and noise. I cannot recommend Milguard, however, because of multiple service failures. Due to manufacturing errors, neither door had functioning screens, with gaps ample for bugs to enter. This was reported by my installation company; then began my service saga with Milguard. There were months-long delays, a last-minute cancellation of an appointment for which I’d adjusted my vacation, and finally today’s long-awaited visit for which I’d adjusted my work calendar, only to have the crew arrive without a replacement needed to complete the repair. Installation was March 2, and it’s now August 2. During this time I’ve had the service department 1) fail to contact me for a couple of months, 2) when I instead contacted them via website service request (another long delay) and finally by phone, claim the installation company failed their reporting protocol, and 3) blame my installers for not fixing it (how were they supposed to fix a too-narrow screen, or one missing a part?) After Milguard’s own manufacturing errors, I would expect the company to take appropriate responsibility, not blame my installers, and to be more accommodating in scheduling a fix already long-delayed. I would expect that when the crew did arrive, they would have the replacement screen they knew I needed—after all, it’d been a month or so after their first, failed appointment (if they’d still needed it, you’d think they’d have manufactured it in the mean time). I would expect that they would have reasonable wait-times on the phone, and a supervisor who would wait for my last question this morning (rescheduling) instead of hanging up with a have-a-pleasant-day sign off, then claim he’d called me back twice during my hold when I called him back. (My phone, witnessed by the crew here, tells a different story. No calls.) The crew today was great, and I feel sorry for them having to deal with cranky customers like me due to this completely inadequate service system.
Date published: 2017-08-02
Rated 5 out of 5 by from Best Windows EVER! We purchased several Ultra series awning & casement windows for our house. They are high quality, easy to operate, look great and provide much needed insulation. We are extremely happy with our windows and have ordered more to replace the remaining old ones.
Date published: 2017-07-15
Rated 1 out of 5 by from Ultra wood clad Gaps at every corner, some 1/16" wide. Taped them when painting kitchen, paper thin wood veneer peeled off when removing tape. The main drawback is that Milgard will not sell/ supply any of the veneer to make repairs, nor will they warranty the veneer coming off. I would be fine if their veneer was available to make repairs. Wish I would have known before spending many thousands of dollars on windows and doors. Damage the veneer and you have to replace the entire window or door rather than repair. All the time and $ to uninstall, reinstall, plus the couple thousand dollars for large windows, I strongly suggest to avoid these.
Date published: 2017-07-09
Rated 1 out of 5 by from Very Poor Support Caveat emptor! While we appreciate the technology and energy savings built into Milgard windows, the company’s customer support leaves a GREAT deal to be desired. Forewarned is forearmed. Here are two of several issues we have experienced: #1: After purchasing a double French door, two single French doors, and 30 plus windows for a major remodel, we decided that we wanted one more window. The color on the entire order had recently been discontinued. Milgard refused to make an additional window in the discontinued color. In these days of on demand paint colors mixed by computer, I consider Milgard’s lack of accommodation very disappointing. Buyer be warned. #2: We experienced difficulty locking the double French door. On May 5, 2017 a Milgard factory service tech determined that the lock needed to be replaced. We were told that someone would call with the next repair date to replace the lock. On May 31st, not having heard, we emailed to inquire about the repair. On June 7th Milgard replied telling us the next available repair date is July 13. We have not been able to lock those doors for over 2 months! Think about that. Buyer be warned. We can not recommend Milgard products.
Date published: 2017-07-04
Rated 4 out of 5 by from Good Window - sloppy finishing I like this window, but the final silicone sealing of the nailing flange was sloppy. I expected better from Milgard.
Date published: 2017-06-28
Rated 1 out of 5 by from poor quality We have ordered Milgard due to good review. But we got our windows with cracked frames, parts and paint problem. It's a disappointment!!
Date published: 2017-06-21
Rated 1 out of 5 by from Defective window seals. MW is aware of the issue but finds excuses not to honor so called warranty. Every window in my house that's 12 years old has defective windows that you cannot see clearly through. They look dirty but have been professionally cleaned & inspected to find every window has defective seals which cause moisure & dirt to get trapped between the panes that cannot be removed without replacing the glass. Their warranty is a joke, good luck getting MW to honor it. After talking to others in my neighborhood THIS IS A KNOWN ISSUE WITH MW BUT THE PROBLEM DOESN'T SHOW ITSELF UNTIL 10 YEARS OR SO! I will never buy or even consider MW windows in thw future nor will I buy a house that has them installed without a contingency that they be replaced with a brand that honors their warranty and does sell defective windows.
Date published: 2017-06-10
Rated 2 out of 5 by from Paint on the window is coming off Jan 27 2016 called j.r window and was told to call milgard, milgard call a painter to repaint windows ,today june 7 2017 still no one as did not a thing. So milgard WARRANTY IS No GOOD!!!!
Date published: 2017-06-08
Rated 1 out of 5 by from Broken on Arrival Our slider arrived broken,while we were out of the country. Even though we were told it wouldn't be arriving for another 3 weeks. Since it arrived while we were out of the country we obviously could not check the slider within the 5 day period that is required. We found it broken and contacted customer service and we were told "too late". It was also implied that we were lying about details such as the original delivery date and attempts at service appointments. Your "writing Guidelines" ask to avoid writing about customer service, of course it does! This is the worst customer service I have EVER been subjected to. The idea that this is a service issue is ludicrous. This is a WARRANTY ISSUE, for a product that was received broken. There should be absolutely no questions about assisting with this damaged product! I will NEVER buy another Milgard product again and I will spread the word to every single person that will listen.
Date published: 2017-06-07
Rated 1 out of 5 by from The Ultra Series is nice but has too many quality issues We replaced all 33 windows in our house with Milgard Ultra windows. We have a mix of casement, slider, single hung and even a new sliding glass door. Within the first four months of owning the windows 7 of them require warranty repairs. From 2 windows showing up with issues (both sliders) to another 5 with issues (sliders and single hung). We had one slider with a damaged frame, one slider where the sliding piece had an issue making it very difficult to open. We have a single hung window which will not stay up. We have a single hung where there is a bent piece and the gasket/seal is coming off. We have another slider that is scraping off the paint from it's frame every time we open it. We have a single hung where the "stopper" for the window just fell out. We have a screen that has popped apart within 3 months of owing it has come apart (and it's a protected screen where dogs, kids etc can't get to it). I also don't like that there are black "threads" inside the windows where they are put together and a significant amount of over gluing on the corners. This is evidently part of the manufacturing process and if I didn't have windows on my deck, I might not notice them so much. This does not meet a "poor" quality so it's just something I need to get used to. I will say the sliding glass door is very nice. The sliders and single hung that work are easy to open. If you have the time and energy to deal with all of the warranty repairs, these aren't bad windows. I just didn't expect over 20% of the windows to have issues within the first year. I wish I'd have looked elsewhere for quality windows for my home.
Date published: 2017-06-06
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