His approach to painting relies on a careful balance of shadow and clarity. Semmler possessed a skill for rendering the physical properties of materials, such as the sheen of silk or the grain of polished furniture. His compositions often use a single light source to create a sense of stillness. This technique gives his genre scenes a formal quality that distinguishes them from more sentimental Victorian works. He avoided complicating his scenes. This directness allows the viewer to focus on the textures and tones of the environment.

Modern collectors value Semmler for the technical mastery and calm atmosphere found in his paintings. His work provides a view of nineteenth-century life without the heavy ornamentation common in that era. The clean lines and controlled colour palettes of his interiors suit contemporary homes. These prints offer a sense of order and historical continuity. His ability to capture a specific moment with clarity appeals to those who appreciate traditional craftsmanship in a modern setting.