| Company | Timeline | Status | |
| Sangwin Surfacing Limited Director • Civil Engineer | 24 Jan 1992←12 Years→25 Jun 2004 | Active | |
| Sangwin Plant Hire Limited Director • Civil Engineer | 18 Jan 1991←13 Years→25 Jun 2004 | Active | |
| Sangwin Concrete Products Limited Director • Civil Engineer | 18 Jan 1991←13 Years→25 Jun 2004 | Dissolved | |
| Ashcourt Construction Limited Director • Civil Engineer | 18 Jan 1991←13 Years→25 Jun 2004 | Active | |
