Hare was the author of a large number of books, which fall into two classes: biographies of members and connections of his family, and descriptive and historical accounts of various countries and cities. To the first belong Memorials of a Quiet Life, Story of Two Noble Lives, The Gurneys of Earlham, and an autobiography in six volumes. This last included a number of accounts of encounters with ghosts. A reviewer in the New York Times concluded that "Mr Hare's ghosts are rather more interesting than his lords or his middle-class people". He also compiled numerous travel books, including a couple for John Murray, as well as many others under his own name, such as Walks in Rome, Walks in London, Wanderings in Spain, Cities of Northern, Southern, and Central Italy, Days near Rome and Sussex. Hare was a friend to the barrister Basil Levett and his wife Lady Mary Levett, the daughter of the Earl of Shaftesbury, to whom Hare left a painting in his will.
Holmhurst
He spent his money on purchasing and refurbishing a house near Hastings, which he named Holmhurst St Mary. In his biography of Somerset Maugham, writer Ted Morgan mentions that Hare, whom he refers to as "the last Victorian," befriended Maugham who became a frequent guest at his country house, Holmhurst in Baldslow, Sussex. After his death, the house was taken by Admiral Sir Lewis Beaumont and family, and then from 1908 Sir John Gordon Kennedy and family. At some point after this the estate was purchased by the Community of the Holy Family, an Anglican order of teaching nuns, with a focus on art and scholarship. Their mother foundress, Agnes Morton, who had formed the community in London in 1896 and later brought it to Sussex, recognised the house and gardens as a piece of Italy—specifically Florence—in England. The girls' school that the nuns ran there, from the 1930s to the 1980s, was known as St Mary's Convent School on the Ridge. Its best-known pupil was Joanna Lumley, an "Army brat" who boarded in the 1960s: "I especially loved my second boarding school, an Anglo-Catholic convent in the hills behind Hastings. The nuns wore blue stockings and were brainy and lovely. There were 70 boarders and I was happy as a clam."