Latest figures from TClarke show turnover for the 15 months to March 31 2025 hit £846.6m from £490.9m for the 12 months to December 31 2023.

Pre-tax profits also increased to £16.3m from £15.6m at the company which employs 760 staff.

Mark Lawrence, Group Chief Executive said: “TClarke combines the scale, expertise, and high-quality in-house resources that set us apart in the market. During the year, we successfully transitioned to private ownership, a significant milestone that enhances our strategic agility and positions the business for long-term growth.

“Our principal activities mean we remain at the forefront of the Building Services industry. Our innovation and expertise are employed in the design, installation, integration and maintenance of the mechanical and electrical systems and technologies that a 21st century building needs for control, performance and sustainability.”

Analysis of revenues for the year by project value show that 46% of TClarker’s order book is made up from projects with a value of £50m+while the forward order book stood at £815m.

We continue to adopt a disciplined and selective approach to tendering, choosing not to pursue projects where margins fall below our acceptable thresholds.

He added: “Our goal is to be the ‘contractor of choice’ in all of our chosen markets, our business is organised  around five well-established market sectors, where we have deep expertise and a strong track record.”

Lawrence said: “We will continue to maintain a strong presence in sectors that provide stable, recurring revenues such as in the public sector, while also building on our proven reputation for delivering complex commercial projects, particularly those beyond our traditional London base.

“We also aim to expand our footprint in the UK’s ‘Golden Triangle’, Oxford, Cambridge, and London, where world-leading research institutions, universities, and global technology companies continue to drive demand for sophisticated engineering solutions.”