Charles T. McGavin, 73, a parking consultant and former director of the D.C. Motor Vehicle Parking Agency, died of heart disease Tuesday at St. Joseph's Hospital in Houston, Tex. He had gone there for treatment on Oct. 30.

Mr McGavin was with the parking agency from 1946 until he resigned in 1952 to become executive director of the National Parking Association. He established his own firm. Applied Parking Techniques Inc. in 1954, and was its president until his death.

After earning an engineering degree at Stanford University, Mr. McGavin spent two years studying parking problems. He designed a completely automatic car parking device and receive a patent on it.

Later he was assistant general superintendent of National Garages in Detroit and then managed a large elevator parking garage in Los Angeles. He became a research assistant and then an instructor in parking problems at Yale University before World War II.

During the war, Mr McGavin served as a lieutenant commander in the Navy. He came to Washington after the war.

He was a native of Springfield Ill. and attended Purdue University.

He is survived by his wife, Virginia M, and a daughter, Virginia Lee, both of the house in Vienna; a son, Charles T. Jr. of Alameda, Calif. and a sister, Garnet, of Catalins Island, Calif.