| Company | Timeline | Status | |
| CDM Ductwork Limited Director • Engineer | 27 Jul 2000←9 Years→30 Jun 2010 | Active | |
| Dis Sprinklers Limited Director • Engineer | 31 Jan 1993←16 Years→31 Mar 2009 | Active | |
| D.I.S. Limited Director • Engineer | 31 Dec 1992←24 Years→6 Nov 2017 | Active | |
Design Installation Service (Electrical) Limited Director • Engineer | 31 Dec 1992←16 Years→31 Mar 2009 | Dissolved | |
| Design Installation Service Limited Director • Engineer | 31 Dec 1992←16 Years→31 Mar 2009 | Active | |
