[1] Heaton's practice was very successful and within a few years he had already designed four apartment buildings, including The Augusta and The Highlands (now the Churchill Hotel).

[2] The Altamont, located at 1901 Wyoming Avenue NW, is one of Heaton's prominent apartment designs and a contributing property to the Kalorama Triangle Historic District.

[1][5] Heaton designed homes for many of Washington's prominent citizens, including Gilbert Hovey Grosvenor, the first president of the National Geographic Society, and the widow of Representative Joseph W. Babcock, whose house now serves as the Embassy of Cape Verde.

[2] Educational buildings designed by Heaton include Corcoran Hall and Stockton Hall (both with architect Albert L. Harris) on the campus of George Washington University and Bunker Hill Elementary School (now called the Brookland Education Campus @ Bunker Hill).

[3][6] His surviving commercial designs include the Equitable Bank Building (with architect Frederick B. Pyle), the National Geographic Society's Administration Building, the Riggs National Bank, Washington Loan and Trust Company Branch (1927 addition; now a Courtyard by Marriott hotel), the John Dickson Home for Aged Men (now the Kingsbury Center), and the Park & Shop, believed to be the country's first planned neighborhood shopping center.