The 60-staff firm provides surveying and engineering services to the UK rail, engineering, construction, utilities and electricity transmission sectors.
It counts Balfour Beatty, Mace, National Grid and Network Rail among its key clients.
Centara will join RSK’s Geosciences and Engineering division.
In the last five years, acquisition-hungry RSK has bought over 60 companies in the environmental, engineering and technical services arena.
The latest deal will further engineering and technical services business RSK’s ‘Green Growth’ acquisitions plan.
Centara’s electrical engineering expertise will sit well alongside RSK businesses Pharos FES and Pharos Generator Services, for switchgear design, and Silcock Leedham for low- and high-voltage connections.
Meanwhile, Centara’s geomatics and service mapping team will add to RSK’s current capacity for surveying, mapping and clearance of buried services in the RSK Orbital, RSK Geosciences and Central Alliance businesses.
RSK Chief Executive Officer Alan Ryder said: “The acquisition will offer RSK the opportunity to grow and improve its existing service mapping and topographic surveying offering while also adding new services in high voltage electrical design and planning, and bureau services. ”