Built between 1864 and 1868, they are well-preserved examples of period Italianate architecture, with some high-quality later Victorian stylistic additions.

The Granniss House is that on the right of the pair; it is a 2+1⁄2-story frame structure, with a shallow-pitch gabled roof and clapboarded exterior.

It has a square cupola at its center, and an arched entrance surround with sidelight and transom windows.

Design of both houses has been attributed to New Haven architect Henry Austin, based on their stylistic similarity to some of his other works.

The two houses came under unified ownership in 1874 by the Burrall family, which owned them well into the 20th century.