Roseview Ultimate Sash Windows
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TheUltimateRose

Ultimate Rose is Roseview's premium uPVC sliding sash window, designed for homeowners who want the closest possible alternative to traditional timber. With a seamless 35mm meeting rail, true mechanical joints, authentic putty-line detailing and traditional sash horn options, Ultimate Rose combines period styling with modern energy efficiency, security and low-maintenance performance.
“Quite simply, the UK’s most authentic timber-alternative sash window.”

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Exterior View

From the outside, the Ultimate Rose sash windows are almost indistinguishable compared with authentic timber. In fact, the difference is so hard to tell, even up close, that our Ultimate Rose sash windows have been accepted in hundreds of sensitive conservation areas where maintaining traditional aesthetics is crucial.

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Interior View

The Ultimate Rose is designed to deliver the perfect modern performance while still retaining your home’s beautiful traditional appearance. Its stunning design is partnered with innovative technology that is not only unique to Roseview but is exclusive to the Ultimate Rose. You won’t find a better sash window elsewhere.

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Our ultimate sash window

Ultimate Rose is the epitome of the Rose Collection design philosophy – outstanding aesthetics and exceptional performance. Ultimate Rose is, quite simply, the UK’s most authentic timber alternative sash window.

We’ve re-engineered timber-alternative sash windows from the ground up, looking at every seam and detail that differed from a timber original and designing them out. The ultra-slim seamless 35mm meeting rail, traditionally styled run-through sash horns and even the internal sash interlock have been redesigned to achieve what no other timber alternative sash window can. A cleaner, more authentic finish that closely reflects the look of traditional timber. The result is that even from close up, only an expert can tell that it’s not timber.

Contact us today for more information about The Ultimate Collection and find an approved installer near you!

  • Seamless 35mm meeting rail and authentic sash detailing
  • True mechanical joints
  • 'A' rated thermal efficiency
  • Reassuring homeowner security
  • Low-maintenance uPVC that does not require regular repainting
  • Independently tested sound insulation
  • More cost effective than standard soft or hard wood
  • Complete weatherproofing as standard
  • Used in hundreds of conservation areas nationwide
  • Personalisation options to suit your home
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Roseview Ultimate Rose Windows
Heritage Rose Sash Windows
Charisma Rose Sash Windows
Roseview Ultimate Rose Windows
Roseview Ultimate Rose Windows

Seamless construction

Most uPVC windows are easily identifiable, not only from the outer sash, sill and beads, but also from more subtle details like the interlocks, capping profiles, inserts, horn caps and astragal bars.

We’ve spent almost two years working on moving or removing these outward facing seams and PVC lines from our market-leading sash windows. Ultimate Rose was already the most authentic uPVC sash window on the market; with the latest iteration, redesigned from the ground up, we’ve pushed standards even further.

None of our range of run through horns have cap lines or seams on the front face, which contributes to our Ultimate Rose windows having an overall aesthetically clean exterior. To elevate the seamless structure further, you can opt for no horns, or upgrade your window frames with Seahorse or Emperor sash horns – both classically designed authentic sash features.

On the inside face, we changed the interlock and added an optional flush-fitting removable staff bead, covering the sash lines for a traditional period look. You can now even opt for a matt finish as opposed to woodgrain for an even more authentic look.

Use our online designer to create the perfect sash window design for your home!

Original Image Seamless Technology
Modified Image Standard
True Mechanical Joints

Joinery Techniques

Ultimate Rose has been designed from the ground up to use end-capped true mechanical butt joints on the frames and sashes, just like those on a timber window.

Typically, a standard uPVC window would have 45-degree grooves or fake mechanical joints where the profiles have been welded together. With subpar double-glazed sash windows, this will be a clear indicator that it is made of uPVC rather than timber.

With the Ultimate Rose, we use a unique, innovative manufacturing process that allows us to eliminate the tell-tale corner weld altogether, using a traditional joinery method instead. This means you get traditional vertical and horizontal butt joints, exactly the same as a timber window. We even go to the trouble of making sure the orientation is right – horizontal joints on the frame and vertical on the sashes – as this is what they’re like in timber. The result is strength and authenticity in the frame and sash, replicating timber construction.

Dolphin white dolphin Dolphin
Emperor Emperor white Emperor
Seahorse seahorse Seahorse
No horn Rose Collection Icon No horn

Sash Window Horn Options

Ultimate Rose is the only uPVC sash window to offer a choice of multiple sash horn styles, giving you more freedom to match the character of your home or achieve your desired look.

From the standard Dolphin style to the softer, Victorian-inspired Emperor and the more decorative Seahorse, each option is designed to suit different property periods, renovations and new-build designs.

Three horn options feature no visible caps across the front face, helping to create a clean, authentic finish. The Dolphin and No Horn styles come as standard, while the Emperor and Seahorse are available as upgrade options for added period detail and design flexibility.

Unique Features

Understanding the Mechanics of Sash Windows

Eclipse Trickle Vents

Eclipse trickle vents provide the ventilation modern homes need without compromising the appearance of your sash windows. The discreet design blends neatly into the window, avoiding the more prominent look of standard uPVC trickle vents.

Ideal for both period properties and new-build homes, Eclipse vents offer a practical way to meet ventilation requirements while maintaining the clean, traditional appearance of the sash window.

Staff Bead

Another optional upgrade, the staff bead is an internal feature of traditional timber sash windows.

On timber, the staff bead is there to physically hold the sash in place.

The Ultimate Rose creates a stylish finishing detail that covers the brush pile lines on both sides of the bottom sash. This staff bead is removable as well, which allows the sashes to tilt inwards for cleaning.

Staff Bead Comparison for Ultimate Rose (with or without)
Chamber Cover Comparison (with or without)

Chamber Cover

A decorative feature exclusive to Ultimate Rose, chamber cover is an innovative system that provides a flush finish to the external balance chamber while still allowing the window to open. It adds an extra level of detail to Ultimate Rose’s traditional appearance that you can’t get with any other uPVC sash window.

The chamber cover is an optional extra that can be colour-matched and finished to your project.

Deep Cill

Our Ultimate Rose can be crafted with a deep cill that perfectly replicates the deep hardwood cills of traditional timber windows.

Older sash windows used to have thicker timbers at the bottom to help prevent the wood from rotting. This is because they helped to prevent water from collecting at the bottom by the cill. This is also why sash windows have deep bottom rails.

This classic feature pays homage to timber designs with this optional upgrade.

Deep Cill
Chalk Matt Finish

Chalk Matt Finish

We offer woodgrain finishes as standard on Ultimate Rose to replicate the traditional appearance of timber.

However, our Ultimate Rose can be crafted with a chalk matt finish. This texture more closely resembles the painted finish of traditional timber sashes.

We are the only sash window manufacturer to offer this finishing style.

Colour Options

white woodgrain

White Woodgrain

white woodgrain sash windows

Crystal White Woodgrain

chalk colour sash windows

White Chalk Textured

swatch cream woodgrain

Cream Woodgrain

Swatch anthracite woodgrain

Anthracite Woodgrain

dark woodgrain window colours

Quartz Woodgrain

woodgrain sash window colours

Pebble Woodgrain

agate grey window colours

Agate Woodgrain

Swatch Shadow Black Woodgrain

Shadow Black Woodgrain

Choose Your Own RAL

Custom RAL

Hardware Options

Gold

Gold

Chrome

Chrome

Bronze

Bronze

Antique Black

Antique Black

Globe Lock Graphite

Graphite

Globe Lock Pewter

Pewter

Ultimate Rose Features

Profile detail Putty line
Meeting rail 35mm seamless
Dolphin run through horns Standard
Emperor sash horns (option)
Seahorse sash horns (option)
No horn (option)
Corner detail True mechanical
Deep bottom rail Standard
Deep cill Option
Astragal bars Authentic
Furniture Globe
Removable staff bead Option
Chamber cover Option
Part q/PAS24/SBD Option
Trickle Vents Eclipse, Concealed, Frame, Sash
Standard U-Value 1.5 (Upgradable to 1.2)
Download Technical Drawing

Ultimate Rose in profile

The Sash Horn Collection Available Now
Roseview Ultimate Windows Video

Frequently Asked Questions

Ultimate Rose is designed to replicate traditional timber sash windows as closely as possible. It features a 35mm seamless meeting rail, true mechanical joints, a deep bottom rail, putty-line detailing and a choice of distinctive sash horn styles with no visible caps across the front face. These details give Ultimate Rose a more authentic timber-style appearance than standard uPVC sash windows, while retaining the low-maintenance and performance benefits of modern uPVC.

Ultimate Rose is particularly well suited to period properties and conservation-sensitive projects because its slim proportions and traditional detailing closely replicate original timber sash windows. Ultimate Rose windows have been accepted for use in hundreds of conservation areas. However, planning and conservation requirements vary, so homeowners should always check with their local authority before replacing windows in a protected property.

Ultimate Rose sash windows are A-rated for energy efficiency as standard. The window is designed to combine traditional styling with modern thermal performance, helping to reduce heat loss and improve comfort throughout the home. Additional specification options may be available depending on the project, so homeowners should discuss their thermal requirements with their installer.

Yes. Ultimate Rose sash windows can be personalised with a wide range of colours, finishes, astragal bar layouts, furniture and sash horn designs. Options include the standard Dolphin horn, Emperor and Seahorse upgrades, and a no-horn design that is particularly suited to Georgian-style windows. Optional details such as staff beads, chamber covers and deep cills provide further opportunities to recreate traditional timber styling.

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