| Charles Ledru - Initial architect | Designed the original building in 1817. |
| Émile Camut - 19th century architect | Enlarged and reshaped the interior in 1890. |
| Agis-Léon Ledru - Architect, son of Charles | Designed the steam establishment in 1850. |
| E. Pincot - Architecte auvergnat | Upgrades the thermal baths between 1934 and 1938. |