John Yeon Speculative House, Modern residential building in Portland, US.

The John Yeon Speculative House is a 1939 house in Portland, Oregon, one of nine speculative houses John Yeon designed between 1938 and 1940 in Portland and Lake Oswego. It uses a modular system with external plywood panels and separate ventilation louvers, allowing fixed glass panes to be set between vertical mullions. Yeon is often named among the originators of the Northwest Regional style.

Built in 1939, the house belongs to a series of nine speculative houses John Yeon designed between 1938 and 1940 in Portland and Lake Oswego, following his Watzek House of 1936. It was listed on the National Register of Historic Places on August 1, 2007.

The residence reflects how American homeowners began expecting their living spaces to connect visually and physically with gardens and outdoor areas. This shift in how people thought about their homes became central to how houses were designed afterward.

The building can be viewed from the exterior and offers insight into experimental architectural approaches with practical applications. The best time to visit is during daylight hours when natural light highlights the design features.

The house belongs to a series of nine speculative houses John Yeon built between 1938 and 1940 in Portland and Lake Oswego. The designs pioneered external plywood cladding and separate ventilation louvers, with fixed glass panes set between vertical mullions. The house joined the National Register of Historic Places on August 1, 2007.