Box Sash Windows
Designed to Preserve Heritage, Engineered for Modern Living
Mumford & Wood’s timber Box Sash windows are rooted in the enduring appeal of the traditional vertical sliding sash, a design synonymous with British architectural heritage. Favoured by architects, planning authorities, and conservation specialists, they are the natural choice for projects where authenticity and compliance matter.
Box Sash Features
Made to Measure
Multi-Layered Engineered Timber
Authentic Heritage Detailing
Traditional Cords, Weights, and Pulley System
Timber Box Sash Windows
Authentic Design Without Compromise
From listed buildings and conservation areas to high-end period renovations and sympathetic new builds, wooden Box Sash windows play a critical role in maintaining character while meeting modern expectations for performance, security, and comfort. Their ability to replicate original detailing, from deep moulded internal profiles and elegant glazing bars to heritage-style finishes such as putty and true bars, ensures seamless integration into even the most sensitive architectural settings.
Our Box Sash windows faithfully replicate traditional construction methods, including cords, weights, and heavy-duty ball-bearing pulleys, while discreetly integrating modern innovations that enhance durability and usability.
Box Sash Windows
Every Mumford & Wood Box Sash window is the result of over 70 years of specialist joinery expertise, combining premium materials with meticulous craftsmanship. We use sustainably sourced, high-quality timber to ensure long-term structural integrity, while our advanced manufacturing processes deliver exceptional consistency and finish. Explore the full range of product specifications within our Conservation, Classic and Heritage ranges.
Timber Box Sash Windows
INDUSTRY LEADING TIMBER WINDOWS
Restoration of Elizabeth Castle
Mumford & Wood were commissioned to design and manufacture 35 bespoke classic box sash windows and one entrance door, faithfully replicating the Castle’s original fenestration. Each window was handcrafted using engineered redwood and red grandis, materials chosen for their dimensional stability, weather resistance, and sympathetic grain character.
Our bespoke Box Sash windows are the perfect choice for all types of projects, including:
Crafted with Precision. Delivered with Expertise.
Timber Box Sash Windows for Professionals
Innovation is built into every detail. Our click-fit staff and parting-bead system allow sashes to be easily removed, simplifying future maintenance and decoration, offering a practical advantage for both end clients and professionals managing long-term building performance.
Beyond the product itself, we provide end-to-end support. Our team works closely with architects, specifiers, and developers at every stage, offering:
- Guidance on planning and conservation requirements
- Technical support for building regulations compliance
- Access to detailed specifications and performance data
- Practical advice to ensure the right solution for each project
Whether navigating complex heritage constraints or delivering high-performance new builds, we ensure a smooth and informed process from concept to completion.
Developers
Bespoke box sash windows designed to meet the demands of new builds and multi-plot schemes.
Developers
Builders & Contractors
Reliable, high-quality box sash timber windows backed by technical support and clear specifications.
Builders & Contractors
Interior Designers
Beautifully crafted timber box sash windows that elevate interior spaces as well as exteriors.
Interior Designers
End Clients
Individually made timber box sash windows tailored to your home, style, and requirements.
End ClientsDevelopers
Bespoke box sash windows designed to meet the demands of new builds and multi-plot schemes.
Builders & Contractors
Reliable, high-quality box sash timber windows backed by technical support and clear specifications.
Interior Designers
Beautifully crafted timber box sash windows that elevate interior spaces as well as exteriors.
End Clients
Individually made timber box sash windows tailored to your home, style, and requirements.
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.
HIGHLIGHTED CASE STUDIES
REQUEST AN ESTIMATE
Start your journey with Mumford & Wood by requesting a no-obligation estimate from our expert team.
