Everything From a Single Source
Finstral develop, manufacture and test every component in-house, ensuring consistent quality throughout.
Precision Engineering, Perfected Since 1969
Founded in 1969 as a family-run business, Finstral has grown into one of Europe’s leading window and door manufacturers – yet it has never lost sight of the principle that built it: control every stage, from raw profile to final installation, in-house.
It’s a philosophy that mirrors our own approach at Century 21, and it’s exactly why the partnership works. As a family-run business ourselves, we share the values of integrity, and are united by the same commitment to quality, care and doing things the right way.
Europe's Most-Certified Manufacturer
Independent testing and certification back up every product we install.
Slimmer Frames, More Glass
Narrow sash designs maximise natural light and unobstructed views.
Proven Track Record
Finstral has nearly 60 years of manufacturing experience across 14 countries.
Visit our Showroom and See the Quality in Person
Touch the products, explore the finishes and talk to our team before you commit to anything. We’re here to help you make the right decision for your home.
10 Bairds Crescent, Allanshaw Ind Est, Hamilton, ML3 9FD
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View our gallery
Our gallery is the ideal place to browse product photos and find the perfect fit for your next project. If you have any questions, please don’t hesitate to get in touch.
Our Full Range of Finstral Products
As one of only a small number of Finstral partners in the UK, we’re proud to offer the complete Finstral range across our residential and commercial projects. This includes high-performance aluminium and wood-aluminium windows for outstanding insulation without compromising on slim, contemporary sightlines.
For seamless indoor-outdoor living, we supply and install a range of sliding and folding doors, designed for maximum glass, effortless operation and barrier-free access. Our range also extends to entrance doors that combine security with design flexibility, along with Passivhaus-certified systems for new build and renovation projects where energy efficiency is essential.
Engineered to the Highest Technical Standard
Behind every Finstral product is a level of technical performance that sets it apart. Every aluminium frame is built around a PVC core, delivering exceptional thermal insulation without the bulk typically associated with high-performance systems. Frames are engineered to be among the narrowest in their class, maximising glass area and natural light while maintaining structural integrity and airtightness.
Backed by independent certification from the Institut für Fenstertechnik (ift), Finstral systems are rigorously tested for U-values, air and water tightness, and structural performance – giving architects, specifiers and homeowners complete confidence in both the numbers and the finish.
Why This Matters for Your Project
Whether you’re an architect specifying performance criteria, a self-builder investing in a forever home, or a contractor needing reliable lead times on a high-value development, Finstral gives us the technical depth to answer the detail – U-values, structural calculations, air-tightness ratings, sash weights and sizes – with certainty, not guesswork.
It’s a partnership built on the same foundations as Century 21 itself: quality without compromise, everything done properly, and nothing left to chance.
Visit our Hamilton showroom to see the Finstral range in person, or speak to our team about specifying Finstral for your next project.
Gallery
What Our Customers Say
We are rated 5.0 onDependable, responsive, quality workmanship and dedication to getting the project completed. Their customer service is second to none. I would...
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Thankerton Builders
via Trustpilot
Ross and the team that carried out our work were fantastic from start to finish. Great communication and fantastic workmanship.
Corrie Deans
via Trustpilot
Great job, and professional company to deal with
Gary Bradburn
via Trustpilot
Very professional Very knowledgeable, delivered on time and fitted perfectly. Will certainly use them again
BSL
via Trustpilot
Great company to use, carried out work for us with no issues at all
DCF Joiners
via Trustpilot
Efficient, competitive and very professional
Paul
via Trustpilot
Dependable, responsive, quality workmanship and dedication to getting the project completed. Their customer service is second to none. I would highly recommend Century 21.
Thankerton Builders
via Trustpilot
Ross and the team that carried out our work were fantastic from start to finish.Great communication and fantastic workmanship.
Corrie Deans
via Trustpilot
Great job, and professional company to deal with
Gary Bradburn
via Trustpilot
Very professional Very knowledgeable, delivered on time and fitted perfectly. Will certainly use them again
BSL
via Trustpilot
Great company to use, carried out work for us with no issues at all
DCF Joiners
via Trustpilot
Efficient, competitive and very professional
Paul
via Trustpilot
4.7 rated on
