1900 - The du Pont family begins to transition from a communal system of partnership-owned homes to private ownership. This marks a shift from the patriarchal, company-controlled structure of the 19th century to personal estates.

1904 - Construction of the New Machine Shop begins.

1921 - The New Machine Shop, along with the Hagley powder yards, closes.

1925 - S. Hallock du Pont, at 24 years old, acquires property, which includes the New Machine Shop, and constructs his private residence, known as Squirrel Run. He uses the New Machine Shop as a barn for his chickens and horses, as well as a storage space for machinery and other items.

1957 - Hagley Museum and Library formed.

1966 - Hagley, excluding the New Machine Shop, is declared a National Historic Landmark.

1974 - S. Hallock du Pont dies.

1984 - S. Hallock du Pont’s son, Richard S. du Pont, donates the New Machine Shop to Hagley.

2003 – A real estate developer approaches Hagley with a proposal to renovate the New Machine Shop into commercial office space, but the proposal is turned down.

2008 - Major repairs are made to the New Machine Shop, including repairs to the roof, replacement of the monitor (clerestory) windows, and installation of new gutters and downspouts.

2011 - Homsey Architects submits plans for a renovation into a Hagley visitor center.

2012 - Frens and Frens Architects submits an architectural assessment to Hagley.

2024 - First visit to the New Machine Shop for consideration as Brandywine Court Tennis.