Ultra™ Series Horizontal Slider

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

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  • 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
Positive Action® Lock
Cam Lock (optional)
Sash Pull

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 196.
Rated 1 out of 5 by from Ultra Sliding door does not seal out weather This is our second house with Milgard the first was fantastic. We bought an Ultra slider in our new house because we wanted a more upscale finish. Well as soon as it got cold the wind blows right through the two doors as well as the top. I had Milgard out and they said it was structurally sound and they could not do anything. How can you sell a door that does not even stop the wind from coming through. I am spending much more heating my house than the old warped wood door. I would not buy the Ultra Fiberglass product it does not work. So disappointed as I had the whole rest of the house to do and now it won't match..
Date published: 2019-03-14
Rated 4 out of 5 by from Brand New House My eleven new casement windows were installed last week. They look beautiful. They appear sturdy and utterly modern. I'm very happy. I'm also happy with the workmen from California Window and Door. They took 3 days to install and were professional and detail oriented. They also cleaned up every night before leaving. However, Milgard mixed up the order on one of my eleven windows and fabricated the wrong size. I'm now waiting for the new final window and I have not been given a timeline. That's unfortunate.
Date published: 2019-03-08
Rated 5 out of 5 by from ULTRA SERIES is the way to go I'm a retired contractor and I put the Ultra fiberglass series in my house. I love this product. The cost is more but definitely is worth it. I live in a northern climate and prefer this product over vinyl every day of the week. Love the warranty also.
Date published: 2019-03-04
Rated 3 out of 5 by from Not up to par for what we paid We are working with our (excellent and reputable) installer, who took photos to document these issues, as we need to get the mitered pieces replaced and reaffixed to the glass, as the blades used to cut them were probably dull or the cuts were careless, resulting in splintered edges and uneven edges/seams where two pieces meet. The edges did not meet one another on the outside of the windows, and there was too much give in the glass. Each of these windows was over $3500, with multi-lights, and it was definitely in the manufacturing where the issues lie. This is a 1938 house and we needed to replicate the original style. We have all other Milgard windows in the house, and this was really disappointing. For Milgard, we were definitely expecting attention to detail, pride in manufacturing and better quality craftsmanship. We now have to wait to paint and get the windows finalized by a Milgard representative.
Date published: 2019-02-20
Rated 1 out of 5 by from 7 weeks for damaged door I paid nearly double the cost of other doors to have a damaged door delivered. Door doesn’t close very well. Watch out for these patio doors. Maybe Millard should be a bit more selective about their dealers.
Date published: 2019-01-26
Rated 5 out of 5 by from Smooth working, beautiful looking. Every feature of these doors delights me. They are so beautifully put together. Simple styling ensures they don't detract from the view, but frame it nicely. The locks make me feel so much more secure-an important feature for our location.
Date published: 2019-01-08
Rated 5 out of 5 by from We love the ease of opening the new casements. Our Ultra (fiberglass) windows were installed about a month ago and we love them. The 2 tone (black bean exterior and white interior) really dress up our home. We selected the 90 degree opening for safety purposes and sliders in the lower level family room as easement windows. Our old windows never opened as the cranks were broken, plus they didn't lock. I feel much safer with these new windows, knowing they will lock and, if there's an emergency, will open easily and quickly.
Date published: 2019-01-07
Rated 5 out of 5 by from So great so far We installed 32 all new windows and a set of patio doors a month ago to replace original wood windows from 1941. The difference in interior temperature, noise level and aesthetics is remarkable. The windows function as they should, though I'm hoping the single-hung sashes slide easier over time. I was hesitant to choose black for both inside and out, and so far I'm glad I did (ask me again in 10 years). Service has been incredible - one window frame's metal clip arrived broken and I just received about a dozen replacements in the mail. We have some experience with Milgard from past projects, I may now be a customer for life.
Date published: 2019-01-05
Rated 4 out of 5 by from Great Door We wanted a quality door for our patio, owning our Handy Man business seeing a wide variety in the quality of products available and had to agree with Shota at Heritage Doors of San Jose that the Milgard door he recommended was the best choice. We just completed the install and are delighted, not only with the great looks and ease of operation but it was a breeze to install as well.
Date published: 2018-12-29
Rated 5 out of 5 by from Great Features! We love our Milgard Ultra Windows. They look beautiful, have significantly reduced noise pollution, solar heat anf heat loss in the tinted months.
Date published: 2018-12-17
Rated 4 out of 5 by from Overall good, issues with caulked screens Good product with some craft issues, two screens caulked in required extraordinary effort to remove. The pins on many screens snapped off or were in too tight and broke. Dealer has not resolved issues after 2 months.
Date published: 2018-11-28
Rated 4 out of 5 by from Great shower window Wanted a full fiberglass for a window located inside of a shower to stand up to the wet environment. Installed an awning window over a fixed window. Great windows. Only downfall is I ordered from Home Depot. They could not order the window frosted or mulled together. So I had to frost them and mull them on site which made more work and not sure how long the aftermarket frosting will last.
Date published: 2018-11-20
Rated 2 out of 5 by from Not the Milgard of yesteryear I just had 2 Milgard installed Ultra doors installed - lots of factory direct quality control issues - hinges sprung on one door - both doors have several screws in the door edge and/or receiving side of the jamb that spin freely rather than snug up. For doors of the $1,800.00 type, this shouldn't be happening. The answer is always, "Call warranty to come out." I will. I did on the last door installed and the "fix" was short lived. Once upon a time, Milgard was a premium vinyl product but that was Milgard of yesteryear, not of today. Consider the soup watered down.
Date published: 2018-11-14
Rated 1 out of 5 by from Poor service-worse communication! Not happy. Worked in construction all my life and I have many, many contacts in the field. Will never recommend Milgard. Why can’t you fix the defects in your products? Why can’t you communicate with clients, Milgard?
Date published: 2018-11-01
Rated 5 out of 5 by from The Ultra Series - Excellent. I researched a lot of window's as well as window companies, but over time selected Milgard Ultra Series Fiberglass surround windows. Perfect fit for my criteria.
Date published: 2018-10-05
Rated 5 out of 5 by from beautiful windows I did a combination of essence and ultra window and doors- I am very happy with the product and thrilled with my service provider- Silan Windsosw and doors
Date published: 2018-09-05
Rated 5 out of 5 by from Fiberglass doors and windows are great The fiberglass doors and windows are great. Very strong, quiet, thermally efficient. I've had several for over 10 years. I've had some crank handles break and some seals get sticky, but MG replaced them without question. They stand behind their lifetime warranty. The only non-warranty issue I have is paint fading.
Date published: 2018-07-16
Rated 5 out of 5 by from smooth operation They are working great and look good. This should be a good summer.
Date published: 2018-07-13
Rated 3 out of 5 by from Looks great, but Milgard needs a couple of fixes. I built a custom home and used the Ultra Series throughout.These were all installed the summer of 2016 and have been living in the home for a year. There are 23 double French doors in the home. So, the doors and windows look great, but there are a couple of simple fixes Milgard can do to make this product better. 1) Each of my French doors come with a small strip of wood on the interior on the bottom. The doors are fiberglass, but you are expected to seal/stain this tiny strip. The problem is, you have these beautiful doors that look very contemporary, but you are either faced with painting them to match the doors, or trying to stain them as dark as you can. I have had several guests ask why there is wood at the bottom of my doors. I ask the same question. The warranty is extensive, but have been told by Milgard that I should have sealed the wood strip, which is not part of the warranty. I now have water stains on the wood strip on about 10 of the 23 double doors. I thought the stains were a result of the seals not preventing water, but am told that it wouldn't have stained had I sealed the wood. It seems like if the seals worked, there wouldn't be stains regardless of whether they had been stained or sealed. Note: I only have stains on the wood strip of the doors that aren't covered by a patio. 2) Milgard uses fiberglass throughout the door (minus the strip mentioned before) but used painted wood for the mullions on the inside. It has a different shape than the outside mullion, made of fiberglass, but then they switched to wood on the inside. It is not so noticeable from far away, but up close you can see the different form. 3) The weather stripping is obviously not working 100% if I am getting water stains for the doors that are not covered by patios. For living in Phoenix area, I would say that I am doing well on energy savings, even having 23 double doors. However, I would recommend fixing as many french doors as possible so that you are not in a situation for leaks. I wanted to be able to open up the house, but know I would fix most of them and keep the look without compromising the energy efficiency. The windows have been great, but the doors need some design attention for the newer products. I wanted to stay clear of any windows or doors with any wood that would need attention or maintenance. It seems as though a few pieces of wood crept into the fiberglass product and reveals a hole the weather stripping and in the warranty of the product.
Date published: 2018-06-21
Rated 5 out of 5 by from Milgard Ultra Patio French Doors I had these doors installed last year and we are in love with them. They are so sophisticated, they have completely changed the look of our home.
Date published: 2018-06-15
Rated 5 out of 5 by from Beautiful door! Just had it installed and it is so beautiful. Has the look of a French door but has a screen and slides.
Date published: 2018-05-30
Rated 5 out of 5 by from Very sturdy, they look great. We are very happy with the doors. They look great and upgrade the look of the room.
Date published: 2018-05-27
Rated 1 out of 5 by from Ultra Series Delivered with torn seals, bubbles under paint, missing hardware, joints at aluminum frame and fiberglass are very noticeable, fasteners made of different material (stainless vs zinc)
Date published: 2018-05-20
Rated 3 out of 5 by from Not very happy I bought 30 ultra windows for $30,000. One essence French door. The hinges on the door are rusted after 8 weeks. The ultra windows cane with a film on them. Like caulking. I’ve worked 30 hours and they still look bad. Requested service 2 weeks ago no response. Then this morning emailed Milgard received a reply someone would get back to me. I purchased their vinyl windows 17 Year’s ago they cane perfect and still are. Not a fan of the windows I purchased this year.
Date published: 2018-05-17
Rated 5 out of 5 by from Easy Gliding Patio Door I am really please with this door. It glides so nice and easy. I really like the door hardware and lock as well. It has a perfect fit.
Date published: 2018-05-15
Rated 1 out of 5 by from Hardware color is upgrade Website states, certain hardware colors are "standard," however ALL except white and clay are "upgrades." So you can choose black frames, but don't expect black hardware...
Date published: 2018-04-19
Rated 3 out of 5 by from First impression was sloppy workmanship Sloppy/Poor weatherstripping on the casement windows. One casement frame is cracked and corner miter separating. Paid a lot for fiberglass Ultra line and am disappointed with initial quality.
Date published: 2018-04-13
Rated 2 out of 5 by from Problems I ordered 3 Ultra sliders for my house. They were all installed yesterday. The one in my family room has two scratches on the panels. But worse than that, the lock doesn't work. It was almost impossible to close. Once we closed it, we now can't get it open. The lock won't budge. The lock is tough in another room as well. Waiting for someone from Milgard to come out and fix the problems.
Date published: 2018-03-10
Rated 5 out of 5 by from Overall great product. Installed many of these in a new vacation home and all were great. One window had a minor problem and a service tech was sent quickly and the problem resolved on the spot. These windows are easy to use and easy to clean.
Date published: 2018-03-05
Rated 3 out of 5 by from Window is nice Unfortunately I had to wait about two months to receive the window, which was special made to fit the specifications for our needs. I was told that Milgard was updating computer system and that was the reason for the delay. When the window arrived, the wood casement was broken. Rather than send the window back and wait for another window to be sent, my contractor fixed the wood and subsequently installed the window. The window is nice, but not happy about the fact that no quality control appears to have been in place to inspect the window and attached wood.
Date published: 2018-02-06
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