International consulting and engineering company Arcadis has bought US design and planning firm RTKL for an undisclosed sum.

RTKL, which has experienced strong growth in the last five years to take a gross revenue of $195m for 2006, will add to the Arcadis portfolio, which already employs 11,000 staff.

RTKL president and CEO David C. Hudson says the relationship will now allow his company, which hires 1050 professionals in six offices – London, Madrid, Shanghai and Tokyo – to expand further around the world.

“It gives us the resources to define the next generation of global architecture and design practices,” Hudson says.

RTKL offers architecture, engineering, planning and creative solutions for commercial, cultural and governmental spaces.

Dutch-based Arcadis’ purchase will compliment its consultancy, engineering and management services in infrastructure, environment and facilities.

Penny Jones