| Company | Timeline | Status | |
| Smart Building Focus Limited Director • Engineer | 29 Sep 2020←5 Years→Current | Active | |
Birchall Air Limited Director • Director | 4 Dec 2007←12 Years→6 Jul 2020 | Dissolved | |
| George Birchall Service Limited Director • Company Director | 1 Sep 1996←29 Years→Current | Liquidation | |
| George Birchall Group Management Limited Director • Company Director | 1 Aug 1995←30 Years→2 Oct 2025 | Dissolved | |
| George Birchall Limited Director • Company Director | 10 Sep 1994←31 Years→Current | Liquidation | |
| Building Environment Control Limited Director • Company Director | 5 Oct 1992←26 Years→22 Aug 2019 | Active | |
