Sliding Box Sash Windows - SashPro

Sash Pro Custom Joiners
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Sliding Box Sash Windows


We’ve been around since the 80’s so you’re not leaving anything to chance when you engage with us. From TFL’s Victoria HQ to various country piles and from the RAF Club to Holland Park’s Debenham House and some pretty top notch K&C, Grosvenor Estate dwellings with Dulwich Estate properties and a wealth (too many to recall) of charming period housing stock in London and the home counties in between. Have a look at our front page gallery for more examples of our work.
sash window repair
In this case the southerly aspect had caused damage beyond reasonable repair so the box frames had to be stripped out to the masonry.
Each project we undertake, be it new sashes to existing  box sash window frames or complete renewal, we make all our windows in our south London joinery which not only means better fitting items but speedy problem solving. We adhere to traditional hand made joinery standards that ensure absolute authenticity.

We ensure our wooden sash windows are energy efficient meeting Part L Building Regulations when complete renewal is the order of the day. 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.
repair of sash windows
…and so were replaced with high performance timber sash windows.
school sash windows
school sash windows finished
…and after. Just in time for school!
Beaverwood School Chiselhurst during an extensive refurbishment to the box frames. The sashes were renewed into the original frame works.
Come and share our exhaustive knowledge gained over the last three decades.
victorian sash windows
notting hill sash windows
Sashpro back in the 90’s in Notting Hill
The ‘railway cottages’ in Clapham
Call: 020 8819 3264 for a quick quote

Why timber windows are still the choice for period homeowners

Since 2004 Building Regulations have had to be extended to include period properties. Yet designated conservvation areas protect original features.
As far back as the early 90's Sashpro was developing ways to improve the weather performance of  period windows. Our Sash windows have gone further still including vastly improved glazing, perimeter gaskets and fitting methods using insulating materials in order to provide for the demanding environmental challenges that must be met. However, our sash windows (and casements and doors) look exactly like original fenestration.

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 one of the first firms to address the preservation of sash windows in general, 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.

Allow these photos to explain
ornate sash window making
reconstructed sash windows
…and installed looking exactly like the original
Complicated sashes can be double glazed (and yes, that’s a lot of sawdust)
sash window repair and reconstruction
remade sash window to look exactly like the original, double glazed and draught proofed
How the original window looked when we brought it back to the workshop...
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