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.

10 plans, ink line drawings on tracing paper, for renovations to Main Building (now known as Forgan Smith Building). Stage 1 comprises 5 drawings for the Law and the Thomas Thatcher Memorial Libraries with drawing numbers A1/54 to A1/58, dated Aug to Sep 1965. The Thatcher Library, established in 1948, provided services for distance education and closed in 1993. Stage 2 comprises 3 drawings for the area between the Library and Arts entrance with drawing numbers A1/59 to A1/61. There is a plan for the Language laboratory which has no job number or details in title block. The final plan is Job A1/32 Proposed mezzanine floor to printery (Library basement): Architectural plan, ink line drawing on tracing paper, 38 x 70 cm; title block has University Architect J.P. Birrell; Job/drawing number A1/32; no date.

The Shapcott press was on the lower ground floor of Main Library. During the extension to Main Library there was discussion that the printery could be housed on the bottom floor of the Main Building. This last plan seems to reflect that idea. When Main Library was extended the Printery was moved to the Industrial Centre Building, located on the corner of Services Road and Hood Street.

Main Library was part of the Great Court buildings designed by Hennessy and Hennessy in 1935-1936. It consisted of two floors with a glass ceiling in the light well in the centre. Main Building was designed to be extended with an additional three floors, with high ceilings and a large light well in the centre. When the Library had insufficient space for students and books it was decided to go ahead with the extension of three more floors, as specified by Hennessy and Hennessy. Birrell proposed five additional floors instead of the three, the installation of passenger lifts, fluorescent lighting, and air-conditioning. Birrell was responsible for the internal arrangement and finishes. This file comprises 15 plans for alterations and additions to Main Library. Includes: sketch of lower ground floor (now Level 1), working drawings for 1st to 5th floors (now Level 3 to Level 7), stair details and compactus shelving.

Main Library was later known as Undergraduate Library; with the construction of Central Library in 1971 its name was changed to Duhig Building; and later, around 2000, to Duhig Tower.

Architectural plan, ink line drawing on butter paper, wtih Proposed alterations to entrance to Main Library. Title block has: University architect J.P. Birrell; Job number A2/21; and dated June 1962.

Fourth floor level of the J. D. Story Administration Building, line drawing in ink on tracing paper, undated. Same as colour drawing in bound presentation volume.

Architectural plan, ink line drawing on butter paper, with cross section and elevation of Main Library. Title block has: job title of Extension to Main Library; University architect J.P. Birrell; no job number; and undated.

Third floor level of the J. D. Story Administration Building, line drawing in ink on tracing paper, undated. Same as colour drawing in bound presentation volume.

One ink line drawing on tracing paper. There is no job number and title block. Dated 28 Oct1964.

Architectural plan, ink line drawing on tracing paper, of the fifth floor of Main Library (now level 7 of Duhig Building). Title block has: job title of Alterations and Additions to Main Library; Interior architect J.P. Birrell; no job number; and undated.

Second floor level of the J. D. Story Administration Building, line drawing in ink on tracing paper, undated. Same as colour drawing in bound presentation volume.