| Company | Timeline | Status | |
| Jerram Property Delivery Limited Director • Construction Director | 30 Jul 2015←10 Years→Current | Active | |
| Jerram Group Limited Director • Construction Director | 16 Dec 2011←13 Years→Current | Active | |
| Jerram Developments Limited Director • Construction Director | 1 May 2009←16 Years→Current | Active | |
| William J. Jerram (Agricultural Investments) Limited Director • Construction Director | 1 May 2009←16 Years→Current | Active | |
| William J.Jerram Limited Director • Construction Director | 1 May 2009←16 Years→Current | Active | |
| Heronsgate Joinery Ltd Director • Construction Director | 1 May 2009←12 Years→11 Aug 2021 | Liquidation | |
| Jerram Falkus Limited Director • Construction Director | 9 Mar 2009←16 Years→Current | Active | |
| Ambershire Limited Director • Contracts Administrater | 20 Dec 2007←17 Years→Current | Active | |
| Jerram Falkus Construction Limited Director • Construction Manager | 4 Nov 2002←22 Years→Current | Active | |
