The practice beat off stiff competition from architects including Danish firm 3XN, which designed the equally controversial museum for Liverpool's waterfront whose future currently hangs in the balance.
Union North also saw off BDP, Studio Egret West, Architype and Feilden Clegg Bradley to revitalise the Park Street residential area of Dingle, one mile south of Liverpool city centre.
The RIBA Competitions Office, which was running the contest, received over 50 entries to work on the project. The shortlist of six was announced in early January.
According to the RIBA, Union North's proposals will deliver a 'variety of new homes on existing brownfield land'.