| Company | Timeline | Status | |
| Mardon Plant Hire Limited Director • Building Contractor | 1 Jul 1999←24 Years→26 Jan 2024 | Active | |
| Kingsknowe Golf Club, Limited Director • Building Contractor | 27 Feb 1999←8 Years→31 Mar 2007 | Active | |
| T.B. Williamson & Son, Limited Director • Building Contractor | 14 Jun 1992←31 Years→26 Jan 2024 | Active | |
