Established in 1978
Trusted by commercial clients across Scotland for over 45 years of manufacturing and installation expertise.
Who We Are
Century 21 is a Scotland-based specialist in aluminium windows, doors and glazing systems. Working with leading European manufacturers, we supply and install high-performance products for residential and commercial projects – combining technical expertise with a genuine commitment to quality on every job we take on.
Glazing manufactured in-house
Every system is fabricated to your exact specification - no third-party assembly, no compromise on quality.
Premium systems
We manufacture and supply only the very best systems and partner with some of the most respected names in the industry.
Scotland-wide coverage
From a single commercial door to a full curtain wall installation, we deliver across Scotland.
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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The People Behind Every Project
Meet the team
Our team brings together experienced surveyors, designers and installation engineers who care about getting it right. From your first enquiry through to final sign-off, you deal with knowledgeable people who take pride in delivering results that last.
Precision Systems, Expertly Manufactured
We work exclusively with best-in-class aluminium systems from Finstral, Smart and Cortizo – manufacturers who engineer their products to exacting European standards. Every frame, every profile and every glazed unit we supply reflects that commitment to long-term performance and build quality.
Supporting Trade Professionals Across Scotland
Century 21 is an established trade partner for architects, developers and contractors who demand reliability. We offer competitive pricing, technical support and dependable lead times – so your projects stay on schedule and your clients stay satisfied.
World-Class Brands, For Any Project
Our supplier partnerships with Finstral, Smart and Cortizo give our customers access to some of the finest aluminium glazing systems available. Each brand is selected for its engineering quality, thermal performance and design versatility – ensuring the right solution for any project brief.
What Our Customers Say
We are rated 5.0 onThank you for our fantastic new front door and back patio doors. The finished quality is brilliant and quick time...
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Craig Noble
via Google
Century 21 fitted two new windows and an entire new porch & front door for us recently and we are...
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Amy Rebecca Kettles
via Google
We are so so happy with our Bifold doors! The quality is first class and the support from the company...
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Chloe Semple
via Google
Thank you for our fantastic new front door and back patio doors. The finished quality is brilliant and quick time both were fitted was amazing.
Craig Noble
via Google
Century 21 fitted two new windows and an entire new porch & front door for us recently and we are delighted with the results! Ross provided a fantastic consultation and gave us direction on what would look best and complement our Edwardian property. They did a fantastic job and were really lovely guys to have around, would recommend to anyone looking for amazing service and great craftsmanship!
Amy Rebecca Kettles
via Google
We are so so happy with our Bifold doors! The quality is first class and the support from the company themselves we couldn’t have asked for more! Ross was more than willing to take the time to discuss our options from different colours to the different set up. When it came to installation the boys were friendly and I could really tell the pride they took i fitting the doors perfectly! Would fully recommend!
Chloe Semple
via Google
