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Made in Britain · Sash Windows · Doors · Bespoke Joinery
Traditional
Craftsmanship.
Modern Performance.
Handcrafted sash windows, doors and bespoke joinery for period and contemporary homes. Built to last, designed for a more beautiful home.
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Proudly Made in BritainMade to measure by Box Sash in our own UK joinery.
Timeless
Homes
Brighter
Tomorrows
Homes
Brighter
Tomorrows
Made in BritainManufactured in our own UK joinery
FENSA RegisteredProfessional installation and compliance
FSCResponsible timber sourcing
50
50-Year GuaranteeTimber-frame guarantee for long-term reassurance
Why Box Sash
A specialist company you can trust with your home.
Box Sash designs, manufactures and installs bespoke timber windows and doors for homes where proportion, character and finish matter.
01
Made by Box Sash in Britain
Your joinery is made to measure in our own UK manufacturing operation rather than treated as an off-the-shelf product.
02
One specialist journey
From survey and specification through manufacture and installation, the project stays connected to the Box Sash team.
03
50-year timber-frame guarantee
Long-term reassurance on the timber frame, plus a 10-year glazing guarantee.
04
Built around the property
Traditional proportions, modern performance and details selected to suit the architecture of the house.
Made to measure.Designed for the house, not a catalogue size.
Windows · Doors · Restoration
What can Box Sash help you with?
Choose the closest match. If you are not sure what your property needs, start an online quote or call us and we will help you work it out.
Windows
Timber Sash Windows
Traditional proportions, made-to-measure hardwood joinery and modern performance.
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Windows
Double Glazed Sash Windows
Improved warmth and comfort while retaining the character of a traditional sash window.
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Windows
Replacement Sashes
Replace failing sashes while preserving the proportions and character of the existing building.
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Windows
Casement Windows
Bespoke timber casements for period properties, extensions and contemporary homes.
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Doors
Timber Doors
Entrance doors, French doors, bi-fold doors and back doors made around the property.
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Restoration
Window Restoration
Repair and improve original timber windows where keeping existing joinery is the right approach.
Explore →Not sure what you need?
Tell us about the property. We will help with the next step.
The online quote takes a few quick choices, or call if you would rather speak to someone.
Made by Box Sash
Made in Britain. Made for the building.
We believe good replacement joinery should respect the architecture it is going into. That means getting the proportions, profiles, glazing, finish and hardware right before anything reaches site.
- Made to measureEvery project is specified around the property and opening.
- Solid timber craftsmanshipTraditional joinery knowledge combined with modern glazing and security options.
- Installation considered from the startThe finished product and the way it is fitted are treated as one project.
Simple From The Start
What happens when you contact Box Sash?
You do not need to know every technical detail. Give us the basics and our team can help establish the right next step.
We review the project
A Box Sash specialist looks at the requirements and speaks with you about the property, priorities and likely scope.
Survey & specification
Where appropriate, we survey the property and agree the details needed to specify the joinery properly.
Manufacture & install
Your joinery is made in Britain by Box Sash and installed as part of the agreed project.
Customer Experience
What customers say after working with Box Sash.
★★★★★
“Professional service and excellent product. OBSW were able to specify windows that other companies said were impossible.”Edward ChristieTrustpilot · November 2025
★★★★★
“The windows are stunning- excellent quality and the installation was so smooth and straight forward. We were thoroughly impressed.”Jill Benjoya MillerTrustpilot · January 2021
★★★★★
“Excellent all the way through. Good product and excellent customer service throughout the whole process Can't recommend them enough.”Mrs CarpenterTrustpilot · December 2020
Selected verbatim excerpts from public five-star Trustpilot reviews. Longer reviews may be shortened; wording shown inside quotation marks is unchanged.
Recent Work
See the standard in finished homes.
Before You Choose
Clear reasons to put Box Sash on your shortlist.
A bespoke window or door project is a significant investment in the house. These are the practical assurances we want you to see before you enquire.
Made in BritainManufactured by Box Sash in our own UK joinery.
FENSA RegisteredA recognised route for compliant replacement-window installation.
FSCResponsible timber sourcing represented in our supplied accreditation.
Established 1979Decades of specialist experience in timber windows and doors.
50-year frame guaranteeLong-term reassurance on the timber frame.
10-year glazing guaranteeAdditional protection for the glazing element.
Free Online Quote · No Obligation
Ready to talk about your windows or doors?
Start online with a few quick choices, or call 01753 858196 if you would rather speak to the Box Sash team.
Made in Britain50-Year Timber-Frame GuaranteeEstablished 1979FENSA Registered