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UPVC Sash Windows

Convenient and simple to operate, the two vertical sliding sashes within the outer frame work independently of each other on a balanced load mechanism, designed to hold the sash at any height.

For a fixed cost based on the sash style, our DIY upvc sash windows supply only are individually manufactured to meet exact customer requirements in unit sizes from a minimum 375mm in width and 800mm in height, up to a maximum of 1500mm in width and 2400mm in height.

Our vertical sliding sash windows are designed to be smooth and sleek with slim profile sections giving a better appearance, which is pleasing to the eye as well as offering improved views from the inside and outside. To complete the timber-like appearance, our windows incorporate the same stylish features found on original timber sash windows such as Astragal glazing bars, decorative sash horns and traditional-style operating hardware. The jambs, sash sections and meeting rail are all engineered to look just like a timber sash window, giving you truly authentic looking new upvc sash windows.

Vertical Sliding UPVC Sash Windows

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white sliding sash upvc windows
grey sliding sash upvc windows
sliding sash upvc window in white
white sliding double sash window

The sliding upvc window sashes also feature an inward opening tilt* facility to allow easy and safe cleaning of the outside frame and glass from inside your home. This is particularly useful for second storey windows or windows positioned in a hard to reach place, such as above a conservatory.

*The tilt function is not available on the top sash with coloured on white sash windows. It has a slide feature only.

Coloured Vertical Sliding Sash Windows

Timber box sash windows were always painted and you can replicate this look with solid White and Cream colour options. If you want a more natural wood effect, our Crystal White, Cream, Golden Oak and Irish Oak foils give a realistic woodgrain appearance that mimics the grained texture and appearance of an original timber window.

We also offer colour outside / white inside options in Chartwell Green, Anthracite Grey, Cherrywood/Rosewood, Black-Brown, Cream, Golden Oak and Irish Oak. With this option you can have the external colour you like, whilst maintaining a white interior to better suit your home’s decoration. If opting for colour on white the top window sash has a slide function only.

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Bespoke and Made to Measure Sliding Sash Windows

Add the finishing touches to your new vertical sliding sash upvc windows with traditionally-styled vertical slider hardware. Tilt knobs, sash lifts, sash locks are fitted as standard. All window hardware is available in White as standard or Chrome, Gold or Satin Chrome for a cost of £15 to compliment our range of upvc sash window frame colours.

Other additional options are available such as integral Georgian or external Astragal glazing bars and trickle vents, to give your new sliding sash style windows a truly authentic and classical vertical slider look.

In addition to this, our sliding sash windows are designed to be extremely safe and secure. High performance locking systems keep your home safe from potential intruders to give you extra peace of mind.

For added safety we also offer the option of a “Fire Egress” window design to provide emergency escape.

UPVC Sliding Sash Window FAQs

Looking for answers about uPVC sliding sash windows? Below we answer common questions about how vertical sliding sash windows work, typical prices and sizes, energy efficiency, security, conservation area suitability, colours, hardware and customisation. If you are replacing old timber sash windows or choosing heritage-style windows for a new project, this guide will help you compare the key features and benefits.

uPVC sliding sash windows are a modern version of traditional sash windows, designed to offer the classic appearance of timber sashes with the lower-maintenance benefits of uPVC. They are made with two separate sashes within the same outer frame, and the sashes slide vertically past each other to create ventilation. Depending on the design, you can open the top sash, the bottom sash, or both. Just Doors uPVC vertical sliding sash windows also feature a practical slide and tilt function, allowing the sashes to tilt inwards so the glass can be cleaned more easily from inside your home.

The cost of uPVC vertical sliding sash windows depends on the size, style, glazing options and any upgrades you choose. Just Doors made-to-measure uPVC sliding sash windows start from £479 including VAT and free delivery. Because every window is made to your chosen specification, the final price will vary depending on the exact dimensions and extras selected.

Just Doors sliding sash windows are made to measure and are available in a wide range of sizes. Standard widths range from 375mm to 1500mm, while heights range from 800mm up to 2400mm. This broad size range makes them suitable for everything from smaller replacement windows through to taller feature windows in period-style homes.

uPVC vertical sliding sash windows are extremely versatile and can suit both traditional and modern homes. They are a popular choice for period renovations, cottages, townhouses and newer properties where you want to add classic character. If your property is listed or located in a conservation area, you should always check with your local planning authority before replacing existing windows.

In some cases, yes. Just Doors heritage-inspired uPVC sliding sash windows are designed to recreate the look of traditional timber sash windows, helping preserve the character of older properties. They are supplied with equal sized top and bottom sashes as standard, run-through horns and traditional styling features, with options such as a 37mm slim mid-rail upgrade and alternative sash splits available on request. However, acceptance in a conservation area will depend on local planning requirements, so approval should always be checked before ordering.

uPVC sliding sash windows offer the traditional sash window look without the high maintenance usually associated with timber. They are resistant to rot, warping and weather damage, and they do not need regular sanding, staining or repainting. A simple wipe down is usually enough to keep them looking their best. They are also a more cost-effective alternative to timber sash windows, while still delivering strong kerb appeal, slim sightlines and heritage styling.

Yes. Just Doors uPVC vertical sliding sash windows are designed with energy efficiency in mind. They feature a 128mm thermally efficient multi-chamber uPVC frame and are fitted with 28mm A-rated double glazing filled with argon gas as standard. This combination helps achieve a U-value of 1.4 W/m²K, reducing heat loss and improving insulation throughout the home. An enhanced thermal upgrade is also available, offering an improved U-value of 1.2 W/m²K.

Yes. Just Doors uPVC vertical sliding sash windows meet the requirements of Part L Building Regulations, making them suitable for use in new build properties as well as replacement window projects where compliance with current energy efficiency standards is important.

Just Doors uPVC sash windows are designed with modern security in mind. They use durable materials and feature an internal beading system as standard, which offers a security advantage over older externally beaded window designs. The locking system fastens the midrails together and is available in both Standard and Heritage styles. For added protection, upgrade options include toughened or laminated glass, triple glazing, child safety restrictors and a PAS 24 high security package for new build requirements.

The optional PAS 24 high security package is designed to meet the latest security requirements for new builds. It includes reinforced tilt latches, top sash security bolts, two high security locking keeps and two high security locks. This upgrade is ideal where enhanced window security is a priority.

Yes. Just Doors sliding sash windows are available in a wide choice of colours, from traditional white and cream through to more contemporary shades such as Anthracite Grey and black. Dual colour options are also available, allowing you to choose a heritage or statement finish outside while keeping a clean white finish inside. Popular options include Chartwell Green, Agate Grey, Rosewood, Black Brown, Cream, Golden Oak and Irish Oak.

Yes. Just Doors uPVC sash windows feature traditional vertical slider hardware, including tilt knobs, sash lifts and sash locks as standard. D handles and pole eyes can also be supplied if needed. Hardware is available in white as standard, or in chrome, gold, black, graphite and satin chrome for a small additional cost, helping you coordinate the window furniture with your chosen frame colour and property style.

A range of optional extras is available to tailor your sash windows to your home. These include Georgian or Astragal glazing bars, fire egress hinges, quick release arms, safety restrictors and trickle vents. Bay poles and couplers are also available for box and bow bay window configurations, making it easier to match replacement windows to existing architectural features.

Yes. Heritage-style uPVC sash windows are designed to recreate the elegant appearance of traditional timber sashes, making them a popular option for period homes and character properties. Features such as equal sightlines, run-through horns and slim mid-rail options help achieve a more authentic look while benefiting from modern glazing, security and lower maintenance.

With proper care and maintenance, uPVC sliding sash windows can offer a lifespan of around 15 to 25 years. Their resistance to rot, weathering and warping makes them a durable long-term choice for homeowners looking for the sash window look without the upkeep of timber.

Yes. A fire egress window option is available to provide an emergency escape opening where required. This can be particularly useful in certain habitable rooms or upper floors, depending on the project requirements and Building Regulations.