Husband and wife team Philip Blakely and Mary Wallace, of Blakely Wallace Associates, are working out of Adams Cottage.
The couple work in the former dwelling with fellow landscape architect Paul Sewter.
"A few boxes to unpack, but it'll be really good," Mr Blakely said, surveying the interior of the restored cottage, which dates back to the 1870s.
Mr Blakely said the company did conservation and heritage work, so operating from a historic cottage fit quite well.
"I've worked in a corporate office before in Queenstown and I like the more laid-back feel of it here," he said.
The Arrowtown Trust was granted consent with conditions by independent commissioners after the trust applied to the Queenstown Lakes District Council to house a cafe or art gallery in Romans Cottage and for Adams Cottage to become professional offices, in October last year.
Granny Jones Cottage will continue to be used commercially. Hofmans Architects is the tenant.
