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Craftsmanship, precision and tradition
Creating timber joinery since 2011
Our story
Q4Sash Windows is a Polish manufacturer of premium timber joinery, specialising in products tailored to the requirements of the British and European markets.
Tradition and experience
We began operations in 2011 with a clear vision: to create windows and doors that combine traditional craftsmanship with modern performance standards. Although our company is just over a decade old, our production team’s experience spans more than 30 years of working with timber.
Quality and precision
From the start, we knew that joinery is not just a functional element of a building. It’s a detail that defines the character of a space, affects residents’ comfort and represents a long-term investment. That’s why every product leaving our factory is the result of precise planning, careful execution and rigorous quality control.
Technology and craftsmanship
Our headquarters is located in Koszalin, where we have a modern production facility equipped with advanced CNC machinery and traditional woodworking tools. This combination of technology and craftsmanship enables us to fulfil both serial orders for developers and bespoke projects for architects and private clients.
Our philosophy
Quality without compromise
We use only certified timber (FSC®, PEFC) and the highest quality components: Remmers coatings, Roto and Caldwell hardware, Schlegel seals. Every element is carefully selected to ensure durability and trouble-free performance for decades.
Tailored to the UK market
Our products are designed with British architecture and conservation requirements in mind. We know the standards, regulations and expectations – from traditional box sash windows to modern sliding systems. We work with architects and heritage inspectors, so we understand the specifics of heritage projects.
Service at the highest level
From first contact to delivery at the specified address – we provide transparent communication, professional technical advice and timely completion. We treat each project individually, regardless of its scale.
Environmental responsibility
We ensure our products are manufactured sustainably. Certified timber, minimised production waste and the long lifespan of our products are our contribution to environmental protection.
Team and technology
Our team consists of experienced joiners, engineers and customer service specialists who are passionate about what they do. At our production facility in Koszalin, we combine:
Advanced CNC machinery
Precise cutting, milling and drilling
Traditional joinery techniques
Manual fitting and finishing
Modern paint shop
Multi-stage coating application in controlled conditions
Glazing assembly station
Integration of sealed units with timber profiles
Quality control at every stage
From raw material to finished product
Thanks to this infrastructure, we can complete even the most demanding projects whilst maintaining the highest standards of quality and timeliness.
Our clients
We work with various client groups in the British and European markets:
Developers and investors
We complete large serial orders for residential projects, maintaining flexibility in adapting products to project specifications.
Architects and designers
We offer technical support at the design stage, advice on system selection and bespoke solutions for unusual projects.
Installation companies and distributors
We provide stable deliveries, transparent logistics and support for companies involved in joinery installation and distribution.
Private clients
We create windows and doors for homeowners who value authenticity, quality and an individual approach.
Listed buildings and conservation projects
We specialise in recreating historical joinery in accordance with heritage protection requirements.
Projects implemented throughout Europe and the UK
Certificates and standards
Our products meet rigorous quality and environmental requirements:
FSC®
(Forest Stewardship Council)
Certificate confirming that timber comes from forests managed responsibly – socially, economically and ecologically.
PEFC
(Programme for the Endorsement of Forest Certification)
International certification system for sustainable forest management.
PAS 24:2016
British standard for resistance to forced entry for doors and windows. Our products have been tested and meet insurers’ requirements.
Weather resistance testing
Our windows and doors undergo tightness tests for wind, water and air in accordance with EN standards.
Acoustic and thermal insulation
All our systems are designed with high energy efficiency and noise reduction in mind.
Already know what you need?
Contact our consultant to tailor the product to your needs.
Q4Sash windows and doors offer quality you can rely on – from design to implementation.