| Company | Timeline | Status | |
| Thomas Callum Limited Director • Company Director | 2 Feb 2023←2 Years 8 Months→Current | Active | |
| BTC Developments Limited Director • Administrator | 22 Jan 2016←9 Years→Current | Active | |
| Smartbuild Building Contractors Ltd Director • Director | 9 Sep 2010←5 Years→1 Sep 2016 | Dissolved | |
| Thomas Callum Associates Limited Director • Company Director | 20 Aug 2007←18 Years→Current | Active | |
| Thomas Callum Associates Limited Director • Co Director | 1 Jan 2003←3 Years→4 Oct 2006 | Active | |
