Founded in 1989, Keystone Lintels is where the Keystone journey began. Today Keystone Lintels is the largest manufacturer of steel lintels in the UK and Ireland.

Keylite Roof Windows was established in 2001 and is known for innovative roof window solutions. Keylite offers a full range of pitched roof windows, flat roof windows, blinds, timber loft ladders and flashings.

Founded in 1958, IG Lintels has a strong heritage in innovation. IG Lintels joined the Keystone Group in 2006, becoming the UK's largest manufacturer of steel lintels.

Smartroof joined the Keystone Group in 2012 and since then has continued to deliver revolutionary, innovative roofing solutions to the UK construction industry.

Wyckham Blackwell has been providing innovative, cost-effective timber engineering solutions since 1884, enhancing the quality, speed and ease of construction.

IG Masonry Support has combined experience with innovation to design and manufacture the most practical and advanced range of stainless steel masonry support products and revolutionary brick slip soffit systems.

Crendon Timber Engineering are the experts in timber engineered solutions with over 50 years at the forefront of the industry.

Keyfix is the market leading non-combustible cavity solutions provider for the entire external cavity. Keyfix is renowned for innovation, technically superior solutions and surpassing clients’ expectations.

Stockgap is a leading building materials distributor, supplying nearly 2000 builders merchants in the South East of England.

Showersave is the market leader in Shower Waste Water Heat Recovery Solutions, providing developers with a cost effective solution to reduce energy costs.