According to Moxon Architects founder Ben Addy, the overhaul, which will complete in the next two weeks, will breathe life into a dilapidated Georgian terrace building on Chepstow Road.
Addy's work for design company Makkina will replace and improve a series of earlier refurbishments carried out during the 1970s. The architect has removed part of the ground floor to create a double-height void space by the building's entrance.
The interior will be defined by a highly-polished white 'insert' that wraps round the stairs and peels off to form the ceiling of the top floor.
This 'insert' was specially made by a boat-maker turned musical instrument craftsman who tried to create an automotive finish to reflect the client's work.
The project received planning permission last November.