One of the defining features of Seattle box houses are extended bay windows on the second floor corners of the facade, often with prominent ornamental brackets.
Other distinctive exterior features include low angle hipped roofs and prominent dormer windows in the center of the facade on the second or third (half) story.
The entry is usually located on the left or right side of first floor, rather than the center, under a covered porch that is usually inset and supported by stout, blocky columns.
This design proved popular with builders, home-buyers and other architects in Seattle's rapidly growing residential neighborhoods and streetcar suburbs, to the extent that some blocks of Seattle's Capitol Hill neighborhood developed around 1910 were built almost entirely according to this plan.
[2] Houses were also built according to the Seattle box plan, by Voorhees and others, in Pacific Northwest cities such as Vancouver, British Columbia,[4] Bellingham, Washington[5] and Portland, Oregon.