Stevenswood, a Livingston, UK-based manufacturer of PVCu and aluminium windows, doors and conservatories, received a £3.5m growth investment.
Business Growth Fund made the investment and took a minority stake in Stevenswood with Patrick Graham joining the board as investor director.
The company intends to use the funds to expand its production capacity and network of trade counters across the country.
Founded in 1997 by the current managing director Ron Hepburn and his now retired business partner Dave Flynn, Stevenswood manufactures more than 1,000 windows and doors per week and sells its products through trade counters in Edinburgh, Glasgow, Aberdeen, Kilmarnock, Dundee.
The company has a turnover of £11m.