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- AWS
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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 Polish manufacturer of specialist timber joinery — designed and tailored for the British and European market. We have been operating since 2011, but 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 and 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
Tradition meets modernity. Ideal for heritage buildings, conservation projects and elegant modern residences.
CASEMENTS
WINDOWS
Elegance and functionality. A modern solution inspired by classic designs.
INWARD
OPENING
WINDOWS
Comfort and energy efficiency. Classic wooden windows with double or triple glazing, opening inwards and with a tilt-and-turn function.
FRENCH
DOORS
A classic entryway with character. Stylish wooden doors with optional glazing on the sides and above the door.
BI-FOLD
DOORS
A modern, barrier-free space. Folding wooden doors are lightweight and weather-resistant.
LIFT & SLIDE
DOORS (HS)
A view that impresses. Large wooden patio doors open up the space. Smooth movement and a low threshold ensure maximum comfort.
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
If you have any questions about our products, would like a quote, or require technical assistance, please contact us by phone, email, or by filling out the form. Our team of experts is here to help.
Our team of experts
Contact details
Our adress
ul. Okienna 3
75-202 Koszalin (Poland)
Call us
Write to us