Architectural practice 3D has hired Mark Taylor, a director at Reid Architecture, to head its first office in London.
Charles Graham-Marr, a director at 3D, said the London office would serve clients in a range of sectors in the South-east, and could be a base for future international expansion.
He said: "It's not a plan to take over the world. But we have become a major practice in Scotland and in recent years have also expanded into England.
"This is a plan to secure business in the south of England and further afield. We've always had clients based in London, so this is a natural step in our expansion plans."
Graham-Marr, who worked with Taylor at Reid during the 1980s, described him as "an ideal match in terms of experience and what we do as a practice".
The practice is recruiting architects for the London office, although Graham-Marr refused to say how many staff would work there initially. The firm employs about 120 staff in its three offices at Glasgow, Edinburgh and Manchester.