In an industry where volatility and competition are the norm, reaching a 30‑year milestone is a rare achievement. This year, Williams Windows Fabrication Ltd, based in Clydebank, is marking three decades in business — a testament to steady leadership, skilled craftsmanship and a clear focus on sustainable growth.
Founded in the mid‑1990s by three members of the Williams family, the company has remained rooted in Clydebank since its inception. While one founder departed early, the stewardship of the remaining partners laid the foundations for long‑term success. The business was later consolidated under William Trainor, who ran Williams Windows for almost 20 years before selling the company in February 2024.
The new owner, Fraser Sinclair, brought with him an unconventional background for the glazing sector — 20 years in corporate banking — but a clear-eyed view of what makes a small manufacturing business work.
“Less than five per cent of companies ever make it to 30 years, and in our industry it’s probably a fraction of that,” says Fraser. “It’s a real credit to the way the business was run and the decision not to chase turnover at the expense of everything else.”
That philosophy has remained central to Williams Windows’ success. Unlike many firms in the sector, the company deliberately avoids large-scale new‑build projects, which Fraser describes as offering thin margins and challenging payment terms. Instead, the business concentrates on a carefully balanced mix of residential work and trade supply.
“You can have millions of pounds of work on the books but if you run out of cash, it means nothing. Doing the right jobs, at the right margins, with the right customers — that’s what keeps a business alive.”
Another long-standing strength of Williams Windows is its decision to manufacture in-house, allowing close control over quality and consistency. This approach has helped maintain the firm’s reputation during a period when several high-profile competitors have exited the market.
Since taking ownership, Fraser has invested heavily in the business, including new machinery, upgraded vehicles, factory and office improvements and a complete rebrand. Behind the scenes, the company has also undergone a significant digital transformation.
“When I arrived, a lot of the business still ran on paper — we were even faxing orders,” Fraser recalls. “Moving to digital systems has completely changed how we work. It’s increased efficiency, reduced overheads and allowed us to do more with a smaller team.”
Today, Williams Windows employs nine staff — fewer than before — but with higher productivity and revenue per employee. Many of those staff have been with the company for decades, a rarity in manufacturing.
“We’ve got people who’ve been here 20 or 25 years, some who joined straight from school,” says Fraser. “That level of loyalty only happens if people feel valued and part of something stable.”
Looking ahead, Williams Windows continues to evolve with the market. Aluminium products now represent a growing part of the firm’s offering, reflecting changing customer preferences, while sustainability has become an increasing focus. The company recycles PVC, glass, plastic and cardboard, and is planning a future transition to renewable energy once long-term premises ownership is secured.
Despite broader economic challenges, Williams Windows is currently bucking industry trends, with strong demand continuing into what is traditionally a quieter period. As the business celebrates its 30th anniversary, Fraser is keen to keep ambition grounded in realism.
“My focus isn’t on getting bigger for the sake of it,” he concludes. “It’s about sustainable growth, strong margins and making sure the company is still here — and thriving — for the next 30 years.”
