The deal is set to strengthen Holmes Miller’s presence in Scotland’s social and affordable housing sector, in which CEA has delivered high-quality projects over the past three decades.

With co-founder Stewart Earley having retired in 2023, ownership and management of CEA has now transferred from Bill Coltart to Holmes Miller with effect from 1 October 2025.

Mr Coltart will continue to play an active role in the business, which will continue to operate under its established name “for the immediate future”.

Holmes Miller says its studios in London and Leeds will now benefit from CEA’s expertise in Scotland’s affordable housing market.

CEA will remain fully engaged in the delivery of ongoing projects, including the recently secured Cairn Road residential project for East Ayrshire Council and 98 new Passivhaus homes for East Dunbartonshire Council, delivered in partnership with hub West Scotland Limited, McTaggart Construction, and Cruden Construction.

Callum Houston, managing director of Holmes Miller Limited, said: “I am delighted to confirm the acquisition of Coltart Earley Architecture as we continue to grow the Holmes Miller portfolio.

“CEA’s impressive record across both private and public housing complements our own residential offering such as the recently-completed, award-winning Park Quadrant Residences with Ambassador Homes and the planning consent achieved for 400+ build-to-rent apartments in Glasgow with KR Developments.

“This acquisition provides us with a springboard into the social and affordable housing market at a time when the UK Government’s new 10-year, £39 billion Social and Affordable Homes Programme presents an unparalleled opportunity to make real, positive impact.

“Having spent time getting to know the CEA team, I have been inspired by their passion, professionalism, and commitment to quality. We are excited to welcome them into the Holmes Miller family and to support their continued success within a larger, stronger practice.”

Mr Coltart added: “I am immensely proud of what we’ve achieved at Coltart Earley Architecture over the past 35 years, having delivered affordable housing, community facilities and conservation architecture to over 70 different housing associations and local authorities, in Scotland.

“Joining Holmes Miller marks the next exciting chapter for the practice — one that ensures our clients continue to receive the personal, high-quality service they value, now supported by the resources and reach of a national, award-winning firm.

“This partnership safeguards our legacy while opening up new opportunities for our people, our clients, and the communities we serve.”