The London practice is the only remaining British office in the contest to design a new residential development close to Tipperary town centre, on a 12ha site.
The firm is now up against two Dublin practices, Carew Kelly Architects and MCO Architects, in the final three. This trio saw off entries from 27 other firms.
The shortlisted project - which is for the Scalaheen area - aims to 'extend the urban grain of Tipperary town centre' and link it with a 'bold new landscape that takes advantage of the River Ara'.
The three shortlisted designs, along with six other entries, will now go on display in the Gallery Room at the Excel Gallery, Tipperary.
A winner is expected imminently.