Located at next to Edinburgh Castle on Grindlay Street, the new office was opened due to the company's growing portfolio of work across Scotland's East Coast.
Recently, the practice was selected as one of three architects for the City of Edinburgh Council Framework, while new projects and clients have been added in Northern England and London.
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The new premises will complement work at the company's Glasgow head office and will oversee work in Leith, Dundee, Galashiels and Edinburgh
To mark the occasion, a launch party was held at the Collective Gallery on Calton Hill, which the practice is currently helping to redevelop.
Director Jude Barber said: "We are delighted that Collective Architecture continues to evolve and grow with our new studio in Edinburgh. It's a real privilege to celebrate with friends and collaborators in such an inspiring, important setting."
(LM)
