| Company | Timeline | Status | |
| David Duckham Limited Director • Architect | 9 Apr 2021←4 Years→Current | Active | |
| Purcell Miller Tritton LLP Non-designated LLP Member • Unreported | 5 Jun 2015←1 Year 9 Months→1 Mar 2017 | Dissolved | |
David Duckham & Robert Tolley Limited Director • Architect | 18 May 2000←17 Years→20 Jun 2017 | Dissolved | |
S T Walker & Duckham Limited Director • Architect | 17 May 2000←18 Years→31 Jul 2018 | Dissolved | |
