| 1911 | 1914 | | Taymount Terrace and Western Avenue |
| 1931 | | | Robert Douglas Memorial Block |
| 1935 | 1936 | | Additional operating theatres and kitchen block |
| November 1951 | | Addition | Part of a five year building programme by the Eastern regional Hospital of Scotland. New outpatients' department proposed at estimated cost of £125,000, a new nurses' lecture block for £12,000, and the first phase for extension to nurses' home for £35,000 |
| 18 October 1957 | | Plans prepared, construction not yet begun | 'Alterations and additions planned to Perth Royal Infirmary, to cost about ₤109,000, include a consultative clinic, a two-storey building for the casualty and x-ray departments, and the reconstruction of part of the existing x-ray and physiotherapy departments.' per Builder p701 |