Timber Sash Windows

Quality sliding sash windows

Our wooden sliding sash windows bring genuine charm and character to every home, faithfully recreating traditional designs while maintaining excellent thermal performance.

Various sliding sash options

We can offer two different types of sliding sash styles including spiral balance as well as cords and weights so you can find the perfect match for your project.

Recreate traditional sliding sash designs

Recreate classic designs with our full range of sash products including slim frames, timber only parting beads, baton rods, sash horns and more.

Energy efficient

Sash-windows timber sliding sash windows are available in double or triple glazing. Both are compliant with the updated Part building regulations and achieve fantastic U-values.

High performing

Not only are our sliding sash windows incredible insulators, they also have great noise reduction capabilities, helping to reduce sounds from outside your property.

Add a splash of color

Every sliding sash window is beautifully factory finished using the most environmentally friendly water-based paint or stain. Choose from RAL Classic, RAL Design, NCS and BS colour charts or match to Farrow & Ball, Earthborn or Fired Earth colour collections. With single or dual colour options you can create the perfect match to the exterior facade and interior decor of the property.

RAL 6005
RAL 5014
RAL 5022
RAL 3011
RAL 7040
London Dust
RAL 5013
RAL 3002
RAL 3005
RAL 7035
RAL 7037
RAL 7024

For supply-only timber windows, I’ve found that Sash Windows is the best option. Their exceptional customer service, top-tier products, and competitive pricing make them the perfect partner for any of my projects.


Sash Windows are the best supplier of commercial timber windows and doors. Their exceptional service, top-notch product quality, on-time deliveries, and competitive pricing made them the perfect choice for me. I highly recommend them.


We have recently purchased five windows and a door from Sash-Windows. The whole process from start to finish has been excellent. They made the ordering and design process really easy and kept me updated on the delivery date, and they even helped me find local trades to install the windows.


Sliding Sash Window FAQ’s

What are sash windows?

Original sash windows of the 18th and 19th century can be found in many historic buildings providing interest and character to the elevations and demonstrating how past generations had the skills to produce extremely fine examples of carpentry. These windows should therefore be seen as part of an area’s architectural heritage and owners should be encouraged to repair or replace them. Many sash windows are situated within listed buildings and consent from local councils will normally be required to alter or replace them.

Before the 16th century, only the most prestigious houses had glazed windows as glass was difficult to produce and therefore very expensive. During the 16th and 17th centuries, the use of crown glass became more widespread and the small panes or ‘quarries’ were set into lead and framed in wrought iron, often fixed into mullioned-and-transomed timber frames in the bigger houses or casements in the more vernacular. Sash windows first came into use in the late 17th century when the heavy glass was contained by thick oak frames and glazing bars.

From the 18th century onwards, cylinder glass was produced which was thinner and available in larger pieces, and this allowed the production of the elegant, more lightweight sashes of the Georgian period. Often part of a formal, classically inspired elevation, sash windows provided a completely different appearance to the more mundane leaded casements of the previous centuries and quickly became highly fashionable. After about 1850 the introduction of plate glass allowed sash windows to be much larger with only one or maybe two panes of glass to each sash, so ‘horns’ had to be added to strengthen the junction of the meeting rail with the frame.

Original sash windows consist of two glazed sashes, which slide vertically in a timber frame, supported by cords that are balanced with metal weights. ‘Yorkshire’ sashes, which can be seen in cottages and the more vernacular buildings, slide horizontally and without weights. Vertically-sliding sashes of the 18th and 19th centuries invariably were sub-divided into six, eight or sometimes more, panes of glass which were always slightly taller than they were wide, reflecting the proportion of the whole window.

Are sash windows hard to open?

Your existing sash windows may be hard to open, but our sliding sash windows move seamlessly, making opening and closing easy peasy

Do you offer a guarantee on your sash windows?

We offer a guarantee with all of our products. Feel free to give us a call to discuss further or check out our Trust Pilot reviews (link) to hear from some of our customers firsthand

Are sash windows draughty?

Old sash windows may be draughty, but with our professional sash window replacement service, we ensure your sash windows are draught-proof. Our sister company, William Richards, provides a draught-proofing service for your existing windows.

Should I replace or repair my sash windows?

That’s a tough one. Our Technical Engineers can provide you with the best advice. We’re always transparent with our customers and offer completely impartial advice

Do you supply sash windows to the trade?

Certainly. We work with a lot of tradespeople and supply them with all of our joinery items. We also offer post-sale advice to make sure you’re using the best methods of installation

How expensive are sash windows?

It depends! We know that;s a terrible answer. Our representative will be able to give you a ballpark figure after dicussing your project. We also offer finance on our sash window packages

Precision Engineering

We use the latest technologies while developing our precision engineered sash window.

ASBP Accredited

ASBP Members and committed to a healthy low carbon environment using sustainable.

FSC® 100%

We only use FSC® 100% certified timber on all of our windows.

Why Choose Sash Windows

Family run business with over 25 years experience

World Land Trust

For every door you buy we donate £1 to World Land Trust

Our memberships & schemes

As a dedicated manufacturer of quality timber windows and doors, we are part of a number of specialist memberships and schemes. Check out the full list below

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