Chronology
| 1908 | Sir William Purdie Treloar establishes The Lord Mayor Treloar Cripples’ Hospital and College in Alton, Hampshire |
| 1948 | The NHS takes over the hospital, absorbing 75 per cent of the Trust’s funds |
| 1949 | The Trust buys a new site at Froyle for Lord Mayor Treloar College to continue to educate physically disabled young men |
| 1965 | Florence Treloar School for Girls opens at Holybourne |
| 1978 | The two schools amalgamate, becoming a single co-educational school, Lord Mayor Treloar College. The Froyle site becomes the Lower School and Holybourne the Upper School |
| 1990 | A £14m improvement programme starts, radically enhancing facilities and equipment at both sites |
| 2000 | The names are simplified to Treloar School and Treloar College of Further Education |
| 2008 | Opening of Brewer House and Chill Out Zone at Treloar College |
| 2009 | Princess Royal officially opens Brewer House |
| 2010 | Vision Treloar’s appeal launched to build new campus enabling co-location of the Trust, School and College on a single site |
| 2011 | Building work on new campus completed |
| 2012 | School students move to Holybourne campus |
| 2012 | HRH Countess of Wessex GCVO officially opens new campus and Wessex House |
| 2012 | Trust moves to Holybourne site |
| 2014 | Refurbishment of College buildings |
| 2015 | Opening of the refurbished Evans House |
| 2016 | Opening of the refurbished Gauvain House |
| 2018 | Uniquely in its sector, Treloar's is rated 'Outstanding' in all 4 areas of its provision by Ofsted and CQC. |
| 2019 | The Supported Internships programme was launched. |
| 2020 | Ofsted has once again rated Treloar School’s residential provision as ‘Outstanding’ in all areas of its inspection. |
| 2021 | Treloar’s patron Alan Titchmarsh opens new Outdoor Learning Centre |
| 2022 | HRH Duchess of Edinburgh visits the Forest School and Hope Court, new staff accommodation, a 42-bedroom block of single-storey, affordable and accessible accommodation on campus. |
| 2023 | Damian Hinds opens Rivermead Gardens, accessible affordable accommodation in Alton. |
| 2024 | Treloar's maintains 'Outstanding' in all 4 areas of its provision by Ofsted and CQC. |