In 1978, John Rennie resigned to practice on his own account and the firm moved from Pollen Street to new purpose-built premises on the corner of Sealey and Mackay Streets from which the firm continues to carry on business today.
The next year saw Brian Crabb join the firm as a staff solicitor and in 1983, as a partner.
At the end of that year, Rodney Poulgrain (son of G.A. Poulgrain), having worked as a staff solicitor at Rudd Garland & Horrocks in Auckland, moved back to Thames, and became a partner in 1986 shortly before Heather Simpson resigned to accept her appointment as a District Court Judge. She was sworn in at the Thames District Court on 30 January 1987.