US engineer Aecom was this week closing in on a deal to take over Davis Langdon, according to sources close to the talks

Building reported last week that the UK’s second largest QS had been in talks with the £3.8bn-turnover group since before Christmas. It is understood US engineer Jacobs was also talking to it.

One source said: “It’s all pointing towards a tie-up with Aecom. An announcement could come as soon as next month.”

Last week, Rob Smith, the senior partner in Davis Langdon, declined to comment on the Aecom approach, but said: “Any decision will relate to our ambition to be the leading global consultant.”