Wellington Jarvis Schaefer, 93, a retired architectural designer for the State Department's Office of Foreign Buildings who also had worked for private architectural firms, died of arteriosclerotic heart disease Tuesday at the Washington home of his son, Edward W. Schaefer.

The elder Mr. Schaefer, who retired from architectural practice in 1950, lived in Spain, California, Florida and Georgia before moving here in 1978 to be near his son, a retired State Department Foreign Service officer.

A former resident of Alexandria, he first came to this area in 1939 to join the old Federal Works Agency. The following year, after transferring to State, he supervised the construction of U.S. embassies in Cuba and Peru.

Mr. Schaefer was born in Warren, Pa., and reared in Brooklyn, N.Y. He received his education in Brooklyn, Paris and Rome. Before World War I, he worked for a Chicago architectural firm.

In the 1920s, he designed a number of New York City schools and theaters, including the interior of the old Paramount Theater on Times Square.

He later became a junior partner in the Chicago architectural firm of Graham, Anderson, Probst and White. In the early 1930s, as the firm's first representative in Philadelphia, he supervised the design and construction of the 30th Street Station of the Pennsylvania Railroad.

Mr. Schaefer's marriage to the late Julia Rogers Walker ended in divorce. His second wife, the former Forrest Dugan, died in 1976.

Besides his son, survivors include two sisters, Ruth Rafferty of Dobbs Ferry, N.Y., and Isabel Dugan of Pacific Palisades, Calif., and three grandsons.

The family suggests that expressions of sympathy be in the form of contributions in Mr. Schaefer's name to the Music at St. Matthews Series, St. Matthews Cathedral, Washington.