Sliding Sash Windows

Double glazed sash windows

Double Glazed Sash Windows

Free your home from rattling windows

  • Authentic period design
  • Smooth running mechanisms
  • Eliminates draughts
  • Traditional wood or modern uPVC

Authentic, traditional charm

Sliding sash windows are a historic style that preserves the beauty of period homes. With traditional style and modern technology, timber sash windows are the ideal choice for conservation areas. Everest uPVC vertical sliding sash windows maintain this authentic appearance of timber, but without the maintenance and are available in woodgrain finishes which look as good as real wood. Our uPVC sash windows are A rated for energy efficiency and include a tilt function for easy cleaning, a perfect combination of performance and practicality.

Sash Windows gallery

Look at how some of our customers transformed their homes with new sliding sash windows.

Choosing your new Sash Windows

Everest offers sliding sash windows in traditional timber or low-maintenance uPVC.

An Everest timber sliding sash window

Timber Sash Windows

A timber sash window is the most authentic option when replacing wooden windows. Everest timber windows are available in Softwood (European Redwood) or Hardwood (Red Grandis), both responsibly sourced and accredited by the Forestry Stewardship Council (FSC). Expertly handcrafted our wood is laminated and engineered for layers to specially bond together adding strength and rigidity. For even further durability our softwood is finger jointed to eradicate knots and resist twisting.

  • Engineered wood to stop rattling
  • FSC certified softwood or hardwood options
  • Smooth running - traditional sash cords or modern spiral balance

Everest white uPVC sash windows

uPVC Sash Windows

uPVC sash windows perfectly combine modern technology with traditional styling. Using an innovative spiral balance mechanism, they operate in the same way and maintain the authentic appearance as a wooden sash window. However, uPVC requires little maintenance, no painting and Everest uPVC sash windows include a tilt function which allows both sashes to tilt inwards for easy cleaning. So, uPVC can offer a great alternative, even if it’s just for the rear of a property when the front must be timber.

  • Excellent value
  • Spiral balance running mechanism to enable a greater glass area
  • Woodgrain uPVC option – you can't tell the difference

Customise your Sash Windows

Everest sash windows are made completely bespoke for you, with a wide range of options and colours to choose from.


A beautiful range of colours and stains, including uPVC woodgrain finishes, which look like real wood, but without the maintenance. Plus, dual colours with white inside and a second shade on the exterior, in-keeping with both the character of your property and inside décor.

uPVC colours


White Woodgrain

Cream Woodgrain

Anthracite Grey

Timber colours



Agate Grey

Beige Grey

Chartwell Green

Light Oak

Mellow Teak

Warm Mahogany

Dark Walnut



For the perfect finishing touch, we offer classic sash window furniture such as sash lifts and fitch locks, all offering flawless operation and outstanding quality.

uPVC hardware

uPVC sash window fitch lock

Fitch Lock

uPVC sash window lift hook

Lift Hook

uPVC sash window sash restrictor

Sash Restrictor

uPVC sash window clean latch

Easy Clean Latch

Timber hardware

Timber sash window fitch lock

Fitch Lock

Wooden sash window lift hook

Lift Hook

Sash restrictor on a timber sash window

Sash Restrictor

Wooden sash window pull handle

Sash Pull Handle

Hardware colours




*uPVC only

Sash horns

On the underside of the top sash section there is an optional component known as a horn. There are two types available: plant on horns and through horns. Through horns offer a richer more authentic aesthetic with the bottom section ‘butting’ against the side sections.

Sash window with no horns

No horn

Sliding sash window with through horn

Through horn

A sash window with a plant-on horn

Plant-on horn

Opening mechanism

Sash window spiral balance opening

Spiral balance

Sash window cords and weights

Cords and weights


All our sash windows come with a double glazed Low-E glass as standard, but we also offer a range of glass options to improve energy efficiency, add aesthetics or provide privacy.

GLAZINGDouble Glazing

GLASS TYPESToughened, Security Laminated




Added extras

Really make your sash windows your own, with many added extras to choose from, including Georgian Bars.

GEORGIAN BARSInternal (uPVC only) or External



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The benefits of Sash Windows

Authentic, practical design

Both our timber and uPVC windows are authentic to the traditional sash design, which has been popular for centuries. We have kept with the characteristic deep bottom rail, Georgian bars, central transom and fitch lock. Sliding sash windows can be opened at either the top or bottom for ventilation and to keep your home secure, a restrictor can be engaged to give ventilation without needing to open your window completely. For practicality both sashes on uPVC can be tilted inwards for easy cleaning.

A timber sliding sash window painted white with gold lift hook

A white wooden sash window slightly open

Innovative, smooth running mechanisms

There are two types of opening mechanism available on sliding sash windows. Our uPVC sash windows are fitted with a modern weighted spring design called spiral balance, whilst on timber, you can choose between the authentic cords and weights, designed to balance the weight of the sash or the spiral balance opening mechanism. Both have been precisely engineered to ensure smooth running and easy finger touch opening, making Everest sliding sash windows effortless to open.

High-quality Sash Windows, guaranteed

  • 10 year guarantee against discolouration of white uPVC
  • 10 year guarantee on window including installation
  • 30 year guarantee against rot & fungus on timber windows


White uPVC sash windows in a bathroom

Sash Window FAQS

At Everest, we understand that choosing new double glazed sash windows can be a daunting task. So to help you here are some frequently asked questions which you might find useful.

  • +
    Can you have double glazed sash windows?
    Double glazed sash windows are an ideal choice for conservation areas or for those who wish to maintain the look and feel of a period property. You can opt for an authentic timber sash look or a maintenance free uPVC option available in woodgrain finishes.
  • +
    What is the sash part of the window?
    The window sash is the part of a window that opens and holds the glass and framework around the glass to keep it in place. Window sashes are extremely important to the overall construction and stability of the window. It is imperative that vinyl window sashes are multi-chambered and reinforced to prevent distortion. If a window sash is distorted, then this could cause issues with leakage and locking of the window itself.
  • +
    How does a sash window work?
    Sash windows are comprised of one or two vertically sliding sashes. To enable the window to remain open a series of clever counterweights connected via a sash cord or a big spring called a spiral balance hold the window open. The sash cord runs over the top of a pulley along the top rail.
  • +
    What is the difference between sash and casement windows?
    The most important difference is that sash windows open vertically and casement windows normally open out or in like doors. Sash windows are the traditional window design and at Everest we feel have a classic timeless style that look great in old and new houses alike. A casement window is a modern variant being more practical and offering benefits such as better security as the lock is constructed within the frame and ease of cleaning. Sash windows are more complex in construction and can require some maintenance unlike casement which is very much fit and leave.
  • +
    Can I replace my sash windows with casement windows?
    Before you look to replace sash windows with casement windows it is important you check with your local authority. In some instances, for example if you live in a conservation area or a listed building, it may not be possible to place your sash windows with a modern casement window design or you may need to apply for planning permission. You will also need to consider your local area, to ensure that any change you make is in keeping with your neighbours. Additionally, it is worth considering if replacing your sash windows with casement windows would make the property less desirable for future owners.

    Read more: Do you need planning permission for windows...

Case Study

Sash uPVC Windows

5 star rating 5 out of 5 on TrustPilot

We love the authentic looking wood grain effect and we’re so pleased that we chose silver furniture, as we feel it adds a vintage feel to the sash windows at the front of the house. Elaine Firkins


Advice and inspiration

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White wooden sash windows


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White uPVC sash bay windows with Georgian bars


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