As a leading figure of the New Objectivity movement, Hubbuch rejected the emotional abstraction of Expressionism. He preferred a cold, almost clinical realism that stripped away sentimentality. His work often features sharp lines and a focus on the physical presence of his subjects. In pieces like 'The Schäfer Sisters' or 'The Idle Hours of the Senior District Judge', he uses a dry and satirical tone to observe German society. He looked at people in the street or in private rooms with a detached, observant eye.

Modern collectors find value in Hubbuch's ability to capture the psychological weight of everyday life. His drawings and watercolours offer a direct connection to the atmosphere of early twentieth-century Europe. The compositions are often sparse, focusing on the human form or architectural details. These prints work well in contemporary interiors because they provide a sense of history without being overly decorative. His sketches, such as 'Study for The Schoolroom', possess a modern and graphic quality that remains relevant today.