There are two architectural drawings, ink on paper, with the title The Union which may form part of the pilot plans for an extension to The Union Building which Birrell designed in 1962. There are 14 drawings for the Master Planning Report upon the Student Union Precinct University of Queensland, which was produced by Birrell and assistant architect Richard Stringer. This report was submitted to the Buildings and Grounds Committee in March 1966. 12 of these 14 drawings have the University of Queensland title block with J.P. Birrell as University Architect. Included with these drawings, which form part of the master plan for the precinct, are several designs for a Union Theatre. There are two pencil drawings related to the Union Theatre, without title, date, or creators. All plans are undated.

Union College was built in five stages from June 1964 to March 1974. It consists of three buildings and two landscaped courtyards. It was built in five separately budgeted stages. Each stage included landscaping and an increase in facilities to common areas of the precious stages. The client for the construction was the Union College Council. The site, suggested by Birrell, was a narrow strip of vacant land on the south western corner of the St. Lucia campus bordered by Upland Road, Sir William Macgregor Drive and Oval No. 1. The site had many well established trees and Birrell's design retained almost all of them. There are 6 volumes of architectural drawings, 175 individual drawings making a total of 242 drawings for the Union College. Stage 1 was by James Birrell as University Architect and Stages 2-5 were by James Birrell & Partners.