Roseview Ultimate Sash Windows
Rose Collection Icon

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.”

Tell me more

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.

TapClick the ‘Rose’ icons to learn more.

Sash Window
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo

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.

Tap the ‘Rose’ icons to learn more.

Sash Window
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo
Rose Collection Logo

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 35mm meeting rail, the seamless run-through sash horns and even the internal sash interlock have been redesigned to achieve what no other timber alternative sash window can; a smooth, seamless finish. 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 technology throughout
  • 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
g13@2x g16@2x MKBucks 2025 - Gold Winner BuildIt Best Sash Windows Logo 10-year@2x secured-by-design@2x ggf@2x ce@2x made-in-the-uk@2x
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 such as interlocks, capping profiles, inserts, horn caps, and astragal bars.

We’ve spent almost two years working on removing these 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 raised the bar even further.

With our seamless technology, we install run-through sash horns as standard, contributing to the overall clean, aesthetically pleasing exterior of our Ultimate Rose windows. To elevate the seamless structure further, you can opt for no horns, or upgrade your window frames with seahorse sash horns – a classic and superior decorative feature. On the inside face, we changed the interlock and added a flush-fitting removable staff bead, covering the sash lines for a traditional period look. You can now opt for a matt finish instead of 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 available with four distinctive sash horn styles, all precision-made using our advanced seamless technology. This delivers a beautifully smooth finish with no visible cap lines or joints. Two styles come as standard, while two premium upgrades offer extra design flexibility and period detailing, providing true authenticity compared to traditional timber sash windows. This is what Ultimate Rose is all about: a true timber-alternative option, with the features to match.

Unique Features

Understanding the Mechanics of Sash Windows

Eclipse Trickle Vents

Ultimate Rose represents the highest level of traditional detailing within the Rose Collection. Designed from the ground up to closely replicate an original timber sash window, it combines an ultra-slim 35mm meeting rail, true mechanical joints and seamless construction with the practical benefits of modern uPVC.

Every detail has been carefully considered, from the deep bottom rail and authentic putty-line profiles to the choice of seamless sash horns and traditional Globe furniture. Ultimate Rose also delivers A-rated energy efficiency, secure modern performance, effective sound insulation and low-maintenance operation. For period properties, sympathetic renovations, and homeowners looking for a premium timber alternative, Ultimate Rose offers the character of traditional sash windows without the regular repainting and upkeep associated with timber.

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.

Sash Window Horn Options

Victorian and Edwardian sash windows – and those that followed – typically had sash horns. Before that, particularly in the Georgian period, sash horns were much less common. That’s why Ultimate Rose is available, either with or without seamless run-through horns – to match the style and history of your home.

If you want your home to have a classic 19th-century aesthetic appeal, then our seahorse sash horn is the perfect decorative feature – as their classic curve has been traditionally used to demonstrate superior craftsmanship.

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 Seamless
Emperor sash horns Seamless (option)
Seahorse sash horns Seamless (option)
No horn Seamless (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, deep bottom rail, putty-line detailing and seamless sash horn options. These details give Ultimate Rose a more authentic timber-style appearance than conventional 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.

Get a quick quote for Ultimate Rose sash windows

* indicates required fields


Privacy Policy
Box Sash Window Manufacturers
Rose Collection Icon

Find the right sash

Pick your property
Box Sash Window Prices
Rose Collection Icon

Call in the experts

Find an installer
Box Sash Window Designer
Rose Collection Icon

Full customisation

Design your own

Copyright © 2026 Rose Collection | Privacy Policy | Cookie Policy

Victorian Sash Windows • Edwardian Sash Windows • Georgian Sash Windows

MADE WITHBY ICAAL