Traditionally Made Timber Sash Windows

Box Sash Windows, Double Glazed, Draught Proofed and Secured by Design

We make all our windows in our south London joinery. This means a good working relationship and speedy problem solving. We work mainly in the South London and Kent areas but can be enticed to work elsewhere (smiley face)

Ensure your wooden sash windows are energy efficient meeting Part L Building Regulations. Over the years we’ve innovated and introduced various solutions that make producing traditional authentic period sash windows that conform to today’s environmental demands not only possible but the norm. You can rely on the fact that charming and sustainable timber fenestration is the right way to go.

Why timber sash windows are still the choice for period homeowners

From 2002 to the latest 2014 UK Part L Building Regs directly informs the timber window industry in the UK concerning newly installed windows across all our housing stock even in conservation areas. They haven’t done this without due diligence. Windows and doors are a necessity in life but they can be beautiful to look at, why not? In fact Building Regs hold into account our historic housing and that includes from the Edwardian era right back to Queen Anne in 1702 with Victoriana in between and very representative of our specialisation.

Sashpro was always developing ways to improve the insulation performance of timber period windows, even in 1989 when no Building Regs existed governing home energy we found that people wanted more from their traditional timber windows than sheer aesthetic value. They required warmth and comfort. The greatest upheaval in those days was perimeter weather seals, permanent draught proofing and we developed 2 types that successfully dealt with the issue but what brought the industry into even further advancement in 2000 was the ultra slim double glazed sealed unit.

At 16mm thickness, a modern double glazed sealed unit today will be as insulating as an older 35mm argon unit which allows the profiles of traditional timber sash and casement windows and doors to remain a feature in their related period houses. This solution is a threefold modification to the glass sealed unit: the inert gas density injected between the two panes in manufacture is krypton, a denser gas than argon, krypton, comprising 1 part per million of our atmosphere, lessens the transference rate of temperatures between the glass. Equally important, Low Emissivity glass reflects internal heat sources back into a room allowing it to heat up more quickly and maintain and preserve that temperature up to 8 times longer in duration. Lastly the perimeter bar is no longer metallic but is what is referred to as “warm edge” which solves the problem of perimeter temperature transference. This is the sort of detail you need to be aware of when choosing your solutions.

All of this permits the period home owner, to re-establish the beauty of their house, purposely meeting Part L Building Regulations while using the most insulating of substrate material, wood.

View our impartial buying advice guide & jargon buster for box sash windows…

Twin Sash Windows
Twin Sash Windows
Former refinements but with high insulation value glazing

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Sash Windows to be replaced
Windows which were to be replaced
New wooden Sash Windows
newly installed wooden sash windows
Victorian Sash Windows
The ‘railway cottages’ in Clapham
SashPro back in the 1990s in Notting Hill

There really are no compromises to be met as timber windows and doors provide the highest thermal performance naturally, over and above items constructed with upvc and aluminium.

As probably the first company to address the preservation of sash windows in general (see About Us), SashPro has helped to develop a number of innovations that make it possible for the period sash window to remain in existence and be accountable ecologically. We developed a weather proofing system that not only addressed the traditional synonymous combination of the words draughty and sash window, now thankfully rendered apart but we did it completely invisibly. In other words it’s one of those clever devices you’ll never see, so sash windows remain unaffected aesthetically.

A sash window frame being made
Complicated sashes can be double glazed
Multi Sash Windows
…and installed looking exactly like the original
Complex sash windows needing refurbishment
How the original window looked when we brought it back to the workshop…
Finely Detailed Sash Windows
…re-made to look exactly like the original, double glazed and draught proofed.

Sash Window Furniture & Hardware

The original elegance and functionality of sash window hardware invariably remains intact save for one or two items that proffer modernity, and all items are available in a variety of finishes including antique brass, polished brass, satin chrome and polished chrome to suit the individuality of the rooms in your home.

To note, catches placed in the centre of the meeting rails of a sash window are there merely to draw the sashes together and should not be considered as a security device.

Use of the sash window ‘sash stop’ is really the only effective way of securing sliding sash timber windows. Happily they are great for preventing children from falling out and burglars from entering. They also allow for secure ventilation.

Sash handles and lifts, used for opening and closing your sash windows can be had in the same finishes mentioned above and being of a decorative shape as well as a practical feature they will give your sash windows that finishing touch that makes them look rather special.

A useful addition to any sash window that is situated, for example, beyond a kitchen counter and is therefore hard to reach is the Meakins device. This apparatus allows you to open and close your sash windows by pulling on a cord that hangs either side of the window. The cords are finished with wooden handles that look and feel traditional. Advisable for anyone who wants to use the window regularly for clearing kitchen odours.