Located several miles north of Purcellville in Loudoun County, the Brown-Koerner House is a well-preserved circa-1815 fieldstone dwelling, a once-common house form in the county’s western part. A vernacular adaptation of the Federal architectural style, the house features local construction materials and a simple design that combines rustic and refined detailing on the exterior and the interior. The house hints at building forms that appeared in the county during the late 1700s yet also showcases elements of architectural styles already popular in high-style houses in larger and more urban areas to the north and east. Compared to the other residential buildings of its era in the area, the Brown-Koerner House’s significance is revealed in its craftsmanship, materials, floorplan, and its intact and original details.