| Company | Timeline | Status | |
| Rackard Johnston Limited Director • Architect | 30 Apr 2007←18 Years→Current | Active | |
| Strawberry Scotland Limited Director • Architect | 7 Jan 2005←14 Years→15 Oct 2019 | Dissolved | |
| Johnston & Company Architects Limited Director • Architect | 11 Apr 2003←22 Years→Current | Active | |
