| Company | Timeline | Status | |
| Constructive Architectural Design Limited Director • Construction Director | 24 Jun 2004←21 Years→Current | Active | |
| System Five Off-Site Ltd Director • Construction Director | 16 Dec 2002←22 Years→Current | Active | |
| Sharphill Timber Supply Company Limited Director • Construction Director | 16 Dec 2002←22 Years→Current | Active | |
| Robertryan Homes Limited Director • Construction Director | 23 Aug 2000←25 Years→Current | Active | |
| Robertryan Timber Engineering Limited Director • Construction Director | 11 Sep 1998←27 Years→Current | Active | |
| R.D.K. Construction Limited Director • Contracts Manager | 25 Feb 1992←33 Years→Current | Active | |
