The Thomas Leiper Estate, also known as Avondale, is an historic, American estate that is located in Wallingford in Nether Providence Township, Delaware County, Pennsylvania. It was added to the National Register of Historic Places in 1971.

History and architectural features

Built by Thomas Leiper circa 1785, this historic estate was named Strath Haven after Leiper's birthplace in Strathaven, Scotland, and includes a three-story, yellow-stuccoed mansion house, a "Fireproof" vault, a communal outhouse, a barn, a carriage house, a smokehouse, a warehouse, a tenant's house, and a quarry. Two local schools, Strath Haven High School and Strath Haven Middle School, are named for the estate. It was added to the National Register of Historic Places in 1971. The Friends of the Leiper House offers weekend guided tours of the house from April through December.

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