Thornbridge sources certified timber and sheet materials from sustainable producers both domestically and overseas. It has a combined sawmill and distribution hub in Grangemouth, as well as eight regional branch outlets across Scotland serving builders, joiners and construction companies.

The firm has revenues of £35 million and employs 159 staff, many of them very long-serving.

To support the existing management team, Jim Faulds and John Declerck will join Thornbridge’s board as chairman and non-executive director respectively, contributing considerable expertise in the buildings materials sector.

Jim brings significant strategic expertise, having served in a non-executive capacity on the Boards of more than a dozen firms backed by leading private equity firms. John, chief executive of Stevenswood, has over 20 years global executive experience in senior management roles at building products distribution companies including Kingfisher and Home Depot.

Bruce Muirhead, managing director of Thornbridge, said: “Our reputation for consistently providing the best products available, with outstanding customer service, has made us leaders in the Scottish market. Our partnership with Cairngorm Capital enables us to support continued growth and heralds a new phase in our development. Together, we will be able to pursue new opportunities for innovation and growth, to the benefit of our customers and employees.”

Neil McGill, investment director and head of Cairngorm Capital’s Edinburgh office, who led the transaction, said: “As investors we are actively engaged in the strategy and operational development of our portfolio companies. Thornbridge is an excellent example of the sort of business in which we like to invest – it is a terrific company, processing and supplying an exceptionally wide range of high-quality timber and associated products, with a skilled and committed workforce offering outstanding customer service. We are delighted to help Thornbridge in its next stage of growth and will be investing additional funds to scale this business rapidly.”