10 - 12 weeks lead time on sash windows

Timber Box
Sash Windows

At Sash-Windows.co.uk, we specialise in traditional box sash windows. Sometimes called a ‘hung sash’ or ‘sash and case’, a vertical window box hides a system of ropes and pulleys which lift the sashes using the traditional operation of a cord and counterweight.

All our box sash windows are custom-built because every house is unique, and every customer has different requirements. We start with a discovery call to discuss our bespoke window options. Our customisation service is without limitation, so we’ll breathe life into your plans during our design visit and then work both on-site and at our workshops to create your vision.

Box Sash Window Stats

Avg. sash window installation price


Most popular


Avg. customer installation

6 days



Box Sash Windows Inspiration

  • Name: James Davenport
  • Location: Blackheath, London
  • Cost: £10,999
  • Project Details: We were invited to tender as part of the full refurbishment of a grand Georgian property that had clearly seen better days. The sash windows were large, and in consultation with the listings officer, we restored this house to its former glory with bespoke timber box sash windows, authentic and traditional and full of period charm.
  • Name: David Butler – Building Manager
  • Location: Leeds Mills Development
  • Cost: £14,975
  • Project Details: This former industrial property in Leeds has now become a commercial hub for designers and startups. Our sister company, William Richards are tasked with the care of their fabulous box sash windows and regularly visit to check that the rope and pulley mechanisms on all the different windows are in good working order.

Our clients

We’ve had the pleasure of supplying windows for some of the nicest homes and best companies in the UK.

Hear from our box
sash windows customers…

Simon Taylor

We needed three sash windows in our new house. I haven't managed box sash windows before, and I was somewhat apprehensive. The design team were so friendly and professional and spent ages talking us through the mechanism and how to care for it. I'll certainly use them again when we replace the sash windows upstairs.

Jane Atkinson

We have 12 box sash windows in our period home and were not looking forward to restoration time, mainly because of the disruption and potential cost. The team from William Richards were professional from start to finish, really careful about our interiors and protecting furniture and carpets, and the final bill wasn’t nearly as bad as we thought. It’s so refreshing to meet people who genuinely care about what they do and offer such good service in this day and age.

Clare Stratton

We have a holiday let and needed a very tight turnaround on some sash window repairs to avoid losing any of our bookings. Ricardo and Paul from William Richards were professional and hardworking, and we’ve already recommended this company to our letting agency for other holiday homeowners in the area.

Peter Wright

I run my own business so am very picky about who I use for work on my home and office premises. I like to choose companies with a solid track record and good reviews. I ordered five new windows, which look fabulous. They have Slimline glazing for great thermal efficiency but keep that really traditional look for my home.

Crafting our
box sash windows

Watch some of our expert team, Ricardo, Ryan and Dale, recreate the classic period charm of this lovely Victorian house in Derbyshire, from selecting that first piece of hardwood timber to the last loving polish of the sill to check that our creation is picture perfect.

Frequently Asked Box
Sash Windows Questions

What’s the difference between a box sash window and a sliding sash window?

Visually, there is no difference, the main distinction is the mechanism of opening the window. The box sash hides a system of ropes and pulleys, which are built into the side of the window and hidden to maintain an attractive visual aesthetic. Newer design windows can use spiral balances which are a modern and simpler alternative to weights and pulleys. These allow the sashes to slide without the added feature of a hidden mechanism within a box as part of the window design, hence the difference.

Should I choose a box sash or a sliding sash?

This depends upon your window, your house and your personal preference. Box sash windows are certainly very traditional and the right choice for a period property, but you have the added factor of looking after the cord and weighted pulley system. A modern sliding sash window will still look the part but is a simpler design and fits well with most building styles, including more contemporary properties.

Is the weight and pulley mechanism easy to repair when the cord breaks?

With the help of good old YouTube clips, It’s possible to repair the cord yourself. However, this is a really good time to inspect the window and make any repairs and the perfect opportunity to call in the expert team from our sister company, William Richards, to sort our the mechanism and make good any defects or soft areas of timber.