Sash Windows

Timber sash windows are highly distinguishable and effortlessly elegant. Found within many period properties, they are a timeless feature that are widely admired and sought after, and quite rightly so! Commonly referred to as box sash windows, they’re boxy in name and in nature. The frame is essentially a box that houses the sashes.

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Georgian Style Traditional Sash Window Bay Burntwood Lane Tooting London (1)

How sash windows work

The top sash hangs on the outer side of the window and the bottom sash hangs on the inner side of the window. An equal weight balances the weight of the sash, and when done right, you can lift the sash effortlessly or;

The sash window slides up and down, which is the key differentiator. This type of window isn’t common in the rest of the world and is typically only found in British colonial countries.

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The history of sash windows

This is a sketch of a sash window from an old joinery and carpentry book that was published in 1902. 

Joiners who built all the period properties around London back then learned from books like these. 

Over the years, many joineries and larger window companies have compromised along the way, and now make timber sash windows that are completely different to traditional sash windows. But they’re still calling them sash windows!

Materials

Wood choice 1: Sapele

Wood choice 1: Sapele

Sapele is a north African hardwood that’s part of the mahogany family. It looks beautiful and has incredible rot resistance. It takes years for any rot to set in, unlike softwood, which can start to rot in just 1 to 2 years. Read more here.
Wood choice 2: Accoya

Wood choice 2: Accoya

Accoya is a softwood that costs more than most expensive hard wood. It doesn’t absorb water in the way other wood does. It doesn’t rot due to the fact rot needs water to develop. Accoya isn’t affected by insect attacks either. Read more here.