A portion of the estate, including the main house, was designated a National Historic Landmark on November 11, 1971.

The private chapel attached to the manor house was built at a time when the founding of Roman Catholic parish churches was prohibited in the colony.

The chapel served as the primary meeting place for the local Catholic community until as late as 1855 when nearby parishes were founded.

[13] During the Civil war, the manor served as a hub for munitions for Southern supporters, also using nearby Mt.

According to a newspaper article: "As one family member put it a few years ago, 'Only God, the Indians and the Carrolls have owned this land.

In 1971, the owner, Phillip Carroll, did not want to commit all 2,042 acres to landmark status, preferring to leave part of it for future development, so about 900 acres were designated landmark status, according to the National Register of Historic Places inventory sheet.

However, with the 1976 Tax Reform Act, the owner changed his mind and requested the landmark status encompass all the acreage, which was granted.

Camilla Carroll, co-owner of the estate, insisted that "...there is no money now to restore anything, and historic buildings are falling down as we speak.

221 acres of Doughoregan Manor were rezoned to allow 325 single-family homes to be built on the north-east side of the property.

Many neighbors were concerned with the plans and a petition was filed in circuit court for judicial review of the zoning decision.

A similar portico to the road was built with a room above, while a marble-floored veranda with iron columns extended to each side.