Box Sash Windows

At Mumford & Wood, our timber Box Sash windows honour the classic design of the traditional vertical sliding window, also known as the double-hung sliding sash, while incorporating advanced technology for enhanced performance, longevity, and ease of maintenance.

NBS Asset

Box Sash Features

Made to Measure

Multi-Layered Engineered Timber

Authentic Heritage Detailing

Traditional Cords, Weights, and Pulley System

Timber Box Sash Windows

Designed for Easy Maintenance and Lasting Performance

A favourite with architects, planning authorities and preservation societies, the Box Sash uses a traditional system of cords, weights, and heavy-duty ball-bearing pulleys and pre-stretched nylon cords. Distinctive deep moulded internal profiles are available in a variety of options with elegant glazing bars to match whichever style you choose.

Typically, a Box Sash window is set back into a 'rebated reveal' construction, with the box frame discreetly hidden behind external brickwork or stone. However, for properties that celebrate their heritage features, box frames can also be positioned proudly at the façade, complemented with a decorative architrave.

Available across all three of our product ranges, the Timber Box Sash window offers toughened glass, double and triple glazing, achieving PAS24 standards in new builds. For listed or heritage buildings, the opportunity to achieve the natural appearance of hand-blown, single glazing is also possible, in addition to hand-faced external putty and true bars, just as the originals would have been.

Conservation Range

Classic Range

Heritage Range

Box Sash Windows

View Box Sash Specifications

NBS Asset

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Timber Box Sash Windows

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Ideal for a Wide Range of Properties

Our bespoke Box Sash windows are the perfect choice for all types of projects, including:

Heritage and Listed Buildings
Conservation Areas
Period Renovations
Sympathetic New Builds

Your Questions, Answered

Frequently Asked Questions

Here you'll find concise answers to common questions about our product range and services. If you can't find what you're looking for, our expert team is always here to help.

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CAD DRAWINGS AVAILABLE IN THE RESOURCE CENTRE

HIGHLIGHTED CASE STUDIES

Multi-Plot Development

Pair of Family Homes Elevated by Timeless Timber Windows & Doors

We were delighted to once again collaborate with Surrey-based developer Harvey Corston on his latest residential project, a partnership that continues to grow from strength to strength.

Building Renovation

New Cambridgeshire Barn Reflects Timeless Rural Design

Nestled within peaceful farmland in Cambridgeshire, the Bourne family, together with local developer Shane Thomas, has transformed a once-unused barn into a beautiful, barn-style family home.

Building Renovation

Agricultural Barns Transformed into Desirable Rural Homes

Over the course of 15 months, David Chidwick of L&L Homes oversaw the transformation of a collection of agricultural barns and outbuildings in rural Petworth into a series of elegant, character-rich family homes.

New Build

Suffolk Self-Build Home Celebrates Craftsmanship & Character

With nearly a decade of experience specifying Mumford & Wood products on commercial builds, self-builder Mr Keeble didn’t need to deliberate when it came to choosing timber windows and doors for his own home.

New Build

Georgian-Inspired New Build Boasts Wooden Windows & Doors

Set in a sought-after Surrey town, this elegant new build is the result of one homeowner’s determination to create her dream home, inspired by the charm and symmetry of Georgian architecture.

New Build

Suffolk Cottage Redesigned for Family Living

With decades of experience in property development, Mr Robertson knew exactly what he wanted when it came time to create his own forever home. But finding the right opportunity wasn’t straightforward.