The Sweett name will continue to be used for just another two months, during an integration phase, but will be dropped come November, after which the entire combined business will trade under the Currie & Brown name.
With the addition of Sweett, Currie & Brown now has around 2,200 employees in more than 60 offices around the world.
As part of the integration, Currie & Brown has appointed Alan Manuel as chief operating officer for the UK & Europe. Formerly managing director of London and the southeast with Sweett Group, he has been with the firm since 1999.
Currie & Brown group chief executive Euan McEwan said: "We are excited to have acquired Sweett. This is an important milestone in Currie & Brown's growth strategy. The merged businesses will create an even stronger global player in our field and we look forward to working closely with our new Sweett colleagues to create a leading construction advisory business."
Alan Manuel said: "I am looking forward to growing our joint business. For our clients it is very much 'business as usual', with no changes to their delivery teams. If anything, they will benefit from our expanded service offering and wider global coverage."