Following Mrs. Hay's death, her heirs established the P.L. Hay Foundation and operated the house as a private house museum.
 By virtue of its national architectural significance, Hay House was declared a National Historic Landmark in 1974.
 In 1977, the ownership and operation of the house was formally transferred to The Georgia Trust for Historic Preservation to ensure its long-term preservation.

In 2000, the White House Millennium Council designated Hay House an Official Project of Save America's Treasures in 2000.
 Today, Hay House is one of Macon's most popular tourist attractions with 20,000 visitors each year.
 The house is also a prominent rental venue for special events.
Following Mrs. Hay's death, her heirs established the P.L. Hay Foundation and operated the house as a private house museum.  By virtue of its national architectural significance, Hay House was declared a National Historic Landmark in 1974.  In 1977, the ownership and operation of the house was formally transferred to The Georgia Trust for Historic Preservation to ensure its long-term preservation.
In 2000, the White House Millennium Council designated Hay House an Official Project of Save America's Treasures in 2000.  Today, Hay House is one of Macon's most popular tourist attractions with 20,000 visitors each year.  The house is also a prominent rental venue for special events.
Johnston–Felton–Hay House