Chester-based Tony Barton has been appointed chairman of conservation architects Donald Insall Associates after 19 years with the practice.
Nicholas Thompson, who was chairman for 14 years, has stepped down but will remain as a consultant to the practice.
Barton is based at the practice's Chester office, whilst deputy chairman Anthony Close-Smith is at DIA's London Headquarters in Devonshire Street.
Robert Dunton, who runs DIA's Bath office, has also joined the board.
Barton said: "We will build on the foundations laid by my predecessors, Nicholas Thompson and Sir Donald Insall, and I look forward to working even more closely with this talented and committed team."
Donald Insall Associates is a specialist architectural practice with a reputation for the conservation and repair of historic buildings and places for the new buildings in sensitive locations.