Ritter's maternal grandfather was the psychiatrist Bernhard von Gudden, who drowned in Lake Starnberg with Ludwig II of Bavaria.

There Hubert Ritter attended the humanistic Wilhelmsgymnasium after Grundschule an der Herrnstraße, where he graduated from high school in 1905 with "very good".

On the recommendation of his teacher Friedrich von Thiersch, he joined the academic architects' association in Munich as a student.

In the same year he became engaged to Margarethe Krauß, the daughter of the director of a mortgage bank, whom he married in the summer of 1911 in the Munich St. Boniface's Abbey.

One of his first jobs there was planning the conversion of the Gürzenich, and that's when he got in touch with Konrad Adenauer, who was in charge of the city's finance at the time, who was enthusiastic about Ritter’s financial structuring of the building complex and persuaded his uncle, Cologne's Mayor Max Wallraf, to entrust Ritter with the renovation of the Cologne City Hall, which lasted until mid-1916.

After staying briefly in Südstraße (today Karl-Liebknecht-Straße), they moved into the ground floor of a house newly built by the architect Riedel at Rückertstraße 18.

At this time, Ritter became a member of the Reichsforschungsgesellschaft für Wirtschaftlichkeit im Bau- und Wohnungswesen (Reich Research Society for Economic Efficiency in Building and Housing).

Shortly before the end of Ritter's electoral term in November 1930, the SPD, KPD and NSDAP demanded that the position of the city planning officer be advertised, and a hate campaign against him unexpectedly broke out.

Moritz Wolf from Hindenburg (today: Zabrze) in Upper Silesia was elected city planning officer for the next six years.

Ritter was finally awarded 1932 by the Technical University of Hanover with his work The hospital construction of the present at home and abroad.

When Leipzig then went over to the Soviet occupation zone of Germany, the occupying power obliged him to build Russian military hospitals.

in Munich: in Cologne: in Leipzig: Ritter's work was part of the architecture event in the art competition at the 1928 Summer Olympics.