| Company | Timeline | Status | |
| Civil Engineering Contractors Association (Scotland) Director • Civil Engineer | 24 Feb 2004←10 Years→27 Feb 2014 | Active | |
| Scott-Orr (Contractors) Limited Director • Civil Engineer | 1 Mar 2000←25 Years→31 Mar 2025 | Active | |
| Thomas Gebbie & Company Limited Director • Civil Engineer | 3 Jun 1998←26 Years→31 Mar 2025 | Active | |
| R.J. McLeod (Contractors) Limited Director • Civil Engineer | 1 Nov 1993←31 Years→31 Mar 2025 | Active | |
