The Dingley Building stands near the eastern edge of Lewiston's commercial downtown area, on a lot bounded by Middle, Oak, and Bates Streets.

It is covered by a tall hip roof, and is set on a raised basement, from which it is separated by a stone beltcourse.

The main entrance is recessed in a large round-arch opening, which shelters the stairs providing access.

The entrance is set in a projecting gabled section, from which a turret rises at the left corner, topped by an open belvedere and a convex circular roof.

[5] A lightning bolt struck the Dingley Building in June 2008, causing no injuries, but resulting in moderate damage to the wooden tower as well as utilities.