| Armand Lefebvre - Bridge and Chaussées Engineer | Author of the original plans (1779), inspired by Soufflot. |
| Jean-Baptiste Harou-Romain - Departmental architect | Directs the work from 1808 to 1817. |
| Nicolas-Philippe Harou-Romain - Architect | Son of the previous; designs the east extension (1830). |
| Léon Marcotte - Architect | Redesign of the courtroom (1865-1868). |
| Charles Lemarquier - Sculptor | Author of the monuments in Carel (1898) and Guillouard (1928). |
| Léon Falconnier - Sculptor | Realizes the allegorical high reliefs (1849). |
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