UK-based building services group behind commissioning specialist Verisys Ltd and building services design consultancy Kaizen Consulting Engineers Ltd, has announced the merger with Decarbonised Ltd.
The merger brings the group’s portfolio to three businesses, marking a significant step in the group’s strategy of building a cohesive ecosystem of complementary companies focused on the built environment. Founded in 2022 by directors Phil Riddeal, Leigh Farr, and Chris Tate, 3OU Holdings has grown to a team of 35 specialists with a combined group turnover of £3 million across Verisys and Kaizen Consulting Engineers.
Decarbonised combines scientific knowledge with practical engineering and advanced modelling to design low-carbon, healthy buildings. The company’s analysis spans every element of building performance, from energy intensity to airflow, daylighting, and temperature control, delivering sustainable spaces designed to meet the challenges of a changing climate. Decarbonised’s building physics expertise directly influences MEP services design and delivery, making it a natural fit alongside Verisys’ commissioning and testing services, and Kaizen’s building services consultancy offer.
Christian Southee, who founded Decarbonised and will continue as its director, said: “This merger is the result of a relationship built on trust and a shared vision for what the built environment should look like. Phil, Leigh, and Chris have been long-standing supporters of Decarbonised, and joining the group feels like the logical next step for our growing business, our team, and our clients. Together, we have a real opportunity to set a new standard for building performance and help clients design and deliver buildings that are fit for the future.”
Phil Riddeal, director of 3OU Holdings, added: “We have worked closely with Christian and the Decarbonised team for a number of years and have long admired what they have built. Bringing Decarbonised into the group is a natural next step as its expertise in building physics and energy services is paramount to the success of any project in the built environment. Together, we are closing the loop on early building physics work and validating design for performance, which sets us apart and helps our clients achieve their ESG goals. We look forward to strengthening the team further in the months ahead.”
The merger supports the group’s mission to construct a long-life, low-impact built environment that adapts to climate challenges and fosters intergenerational wellbeing.
Legal advice was provided by Ward Hadaway LLP, acting on behalf of 3OU Holdings, and Renew Legal, representing Decarbonised Ltd.
