| Company | Timeline | Status | |
| Yorkshire Independent Building Supplies Limited Director • Architectural Stone Supplier | 29 May 2002←23 Years→Current | Active | |
| A.D. Calvert Architectural Stone Supplies Limited Director • Stone Supplier | 24 Nov 2000←24 Years→Current | Active | |
| A.R. Calvert (Leyburn) Limited Director • Builder | 8 Oct 1993←32 Years→Current | Active | |
