| Company | Timeline | Status | |
| Paul Ventilation Services Limited Director • Director | 27 Jun 2019←3 Years→16 May 2023 | Active | |
Passive House Centre Limited Director • Director | 4 Feb 2010←8 Months→10 Oct 2010 | Dissolved | |
| Sustainable Homes Scotland Ltd Director • Unreported | 20 Sep 2007←18 Years→Current | Active | |
| Sustainable Homes Scotland Ltd Secretary • Unreported | 20 Sep 2007←5 Years→20 Sep 2012 | Active | |
