Windows and doors
define your home.
Choose quality
and design that
speaks for itself.
We craft wooden joinery that goes beyond a functional building element. These are the details that catch the eye, enhance comfort, and give character to every project. Trust in the craftsmanship and precision that make the difference.
Take a closer look
at our story.
Q4Sash Windows is a manufacturer of specialist timber joinery — designed and tailored for the British and European markets. We have been operating since 2011, yet our production team brings over 20 years of experience working with wooden windows and doors.
In our philosophy, joinery is more than an architectural element. It is an expression of attention to detail, lifestyle and investment value. Q4Sash windows and doors are designed to serve for years — and look great for even longer.
Why Q4Sash Windows?
Q4Sash is a partner that understands architecture, precision and international logistics.
Exceptional quality
since 2011
From the very beginning, we have consistently prioritised quality, authenticity and durability. This has earned us the trust of architects, investors and individual clients across Europe.
Certifications
and precision
Our products meet rigorous quality standards — FSC®, PEFC, PAS 24, weather resistance and acoustic insulation testing. We use only the finest components: knot-free timber, Remmers lacquer, Roto and Caldwell hardware, Schlegel seals and more.
Made for British
& European markets
Our designs combine classic aesthetics with modern functional solutions. We create products for historic tenement buildings, contemporary residences and large-scale development projects.
Service you can
rely on
From the first point of contact through to delivery — we ensure transparency, technical expertise and efficient logistics.
Learn more about our products
Thanks to the natural flexibility of timber and modern technology, our products are robust, beautiful and fully customisable. Whatever the system or scale of your project — we will tailor our offer to your needs.
SASH
WINDOWS
We craft it the traditional way — with cords, weights and pulleys — or with discreet modern spring balances, always with today’s standards of comfort, security and efficiency.
CASEMENT
WINDOWS
From country cottages to contemporary self-builds, our made-to-measure casement windows combine clean traditional lines with outstanding thermal performance.
INWARD OPENING WINDOWS
Tilt-and-turn timber windows in three performance levels — from classic comfort to passive house standard.
FRENCH
DOORS
Handcrafted double doors that flood your interior with light — in classic or contemporary styling, opening inwards or outwards to suit your space.
BI-FOLD
DOORS
Folding walls of glass and warm natural timber — connecting kitchen, living space and garden in one smooth movement.
LIFT & SLIDE
DOORS (HS)
Let us craft joinery that defines your home for generations.
From the first consultation to safe delivery — we provide full support and a product refined in every detail.
Send us your dimensions or documentation and we will prepare an offer tailored to your needs.
See what our projects look like
Our windows and doors are part of projects completed across London, Manchester, Bristol and Edinburgh. We work with developers and architects as well as individual clients throughout the United Kingdom and Europe.
Already know
what you need?
Check the catalog for details or contact our consultant to tailor the product to your needs.
Q4Sash windows and doors offer quality you can rely on – from design to implementation.
Meet our trusted partners
