Sharecast - Mitie (LON:MTO) said the deal builds on its position "as the UK's leading intelligence and technology-led security provider".
R H Irving Industrials has around 25 years of experience delivering a broad range of complex security services, including the design, installation, and maintenance of electronic security systems, perimeter security fencing, gate automation, hostile vehicle mitigation, cyber protection, civil engineering, and earthing services.
Mitie said it has a strong reputation in highly regulated sectors, such as critical national infrastructure and utilities, and it has also been expanding its earthing capabilities into high growth areas where Mitie has also been expanding, such as 5G and electrical vehicle charging infrastructure.
Jason Towse, managing director of Mitie Business Services, said: "R H Irving Industrials is our second security-related acquisition in recent months, reflecting the group's strategy to invest in high growth, high margin companies in the key sectors of security technology, decarbonisation, and telecoms.
"The business both complements and enhances Mitie's existing capabilities and customer base."