CMS Window Systems is the leading provider of 360-degree building envelope solutions to the commercial construction and social housing sectors.

Specialising in energy-efficient and environmentally-friendly products, the business supports customers as they procure and deliver some of the largest housing investment programmes and commercial build projects in the UK. It also provides services from design and manufacture, through to installation and aftercare.

In May 2016 CMS Window Systems (CMS) secured a significant minority investment from LDC to support the business’ expansion. 

Since then, CMS has opened an 8,500 sq ft PVCu door manufacturing and recycling plant in Kirkaldy, increased the production capacity of its Cumbernauld headquarters, strengthened its management team with the appointment of David Ritchie as CEO and launched a new over-the-counter trade sales service, which offers its energy-efficient products to sole traders and SME contractors.

CMS’s extensive programme of capital investment and service diversification has coincided with a string of contract wins for the business. In 2017, it was appointed to North Lanarkshire Council and East Dunbartonshire Council’s window and door replacement frameworks.

In addition to securing deals with public sector clients, CMS has also supported on several high-profile commercial construction projects. In 2019 alone, it provided aluminium glazing packages for Cala Homes’ re-development of Edinburgh’s Donaldson Estate and Balfour Beatty’s Prince & Princess of Wales Hospice in Glasgow’s Bellahouston Park.

In 2019 LDC completed the sale of CMS for an undisclosed sum to Maven Capital Partners. Today, the business employs almost 300 people, and is on track to record revenues of £40million for the year ending March 2019, up 25 per cent during LDC’s tenure.



Our partnership with LDC gave us the strategic guidance and financial firepower we needed to deliver our ambitious growth strategy. Energy-efficiency and the use of environmentally friendly construction practices have become an essential consideration for our sector. With LDC's support, we've been able to capitalise on our business's green credentials - dramatically increasing our production capacity and expanding the scope of our offering to take advantage of increased demand for our specialist products and services.
David Ritchie, CEO, CMS Window Systems