Aedas is to split into two separate businesses.

The move, which took effect from 9am this morning, will see the 450-strong UK arm of the business separate from the rest of the group and rebrand as AHR.

AHR chairman Brian Johnson, who was previously chair of Aedas UK, told BD’s sister paper Building there was no animosity behind the split, describing it as a “conscious uncoupling”.

The decision to split will see the world’s fifth-biggest architect (by architects employed) effectively demerge into the two companies, Hong Kong-based LPT and UK firm Abbey Holford Rowe, that joined together to form Aedas in 2002. The rest of the group, operating out of Hong Kong, will remain as Aedas. Financial details of the deal were not disclosed.

Johnson said the decision to demerge had been taken because the two firms had embarked on “very different trajectories” over the last year, with the Hong Kong business taking advantage of the booming Chinese commercial market, and the UK firm plotting steadier growth and having a larger reliance on public sector clients.

“We’re operating in two different markets,” Johnson said. “Our markets are very different, our clients are very different. In a way we’re going back to where we were 12 years ago – it’s been called here a conscious uncoupling.”

The split will leave AHR, which is just over half the size of the remaining portion of the group, as a 450-strong practice operating eight offices in the UK and four overseas. Johnson said the firm was also on course to open an office in Dubai with 10-15 staff by “late summer or early autumn.” This will service projects already won in the Middle East such as the £1.5 billion Cleveland Clinic project in Abu Dhabi, as well as look to win new work.

Johnson said Aedas, which has not yet published audited accounts for 2013, turned over £35 million in the UK last year, making £900,000 profit. He said turnover for AHR in 2014 would fall following the demerger because of the decision to leave joint venture projects with Aedas, to about £31 million. However he said he was expecting profit to rise to around £1 million. The whole group turned over approximately £120 million a year prior to demerger.

Johnson said discussions over the split started at the beginning of the year. He said the strength of the Aedas name internationally would leave the firm with work to do to re-establish itself overseas with the new brand. “Our immediate focus will be in building strength in the regions where we have eight offices, and we’ve managed to sustain those through the recession. Then we will have to stabilise offices in Moscow, Almati and Warsaw. Aedas has been a big name internationally; we’ll have to work harder there to get our brand strengthened.”

However, he said retaining the Aedas name, which was jointly owned 50-50 by the UK and Hong Kong-arms of the business, had not been a point of contention in the demerger talks. “Keith [Griffiths, Aedas chairman] had developed the business more internationally, and that name was better known internationally, whereas the UK business has been through changes before, so it’s not a big issue.”

The move comes as AHR, architect on the planned revamp of Euston and the £80 million Holland Park School, has recently won work including a feasibility study for the planned £80 million revamp of the BBC’s Oxford Road site in Manchester, and a new £10 million office scheme for Cumbria County Council. It is also behind the £18 million Talbot Gateway scheme for Blackpool council (pictured).