The house and estate was first listed as a Jacobean manor during the 1600’s and was rebuilt in 1775. The building was remodelled 1836-40 but a disastrous fire resulted in the reconstruction of the current mansion in1898. Notable owners were the Gwynne Holfords who were great benefactors in the locality with James becoming High Sheriff of Breconshire in1857 and an MP between 1870 and 1880. Llansantffread church was entirely rebuilt by the Gwynne Holfords and their family monument is a prominent structure in the graveyard overlooking the A40. After his death in 1916 the estate was eventually sold. In 1922 Buckland was listed as having 2,600 acres of land with many tenanted farm and houses plus four miles of fishing along the Usk. This had been partly purchased by Henry Seymour Berry a highly successful businessman and multimillionaire who was made Lord Buckland of Bwlch in 1926. Apart from hosting lavish events on his estate, which included a golf course and renowned gardens, he gave generously to local projects including Brecon War Memorial Hospital. In 1928 he was killed in a riding accident on the estate.

With the onset of WW2 the War Office appropriated the mansion and grounds and following a very destructive occupation by Canadian troops it became a military hospital. In 1941 the Llewellyn family, who had bought the estate in 1935, returned to find their property in such a state that they sold it to the War Office who in turn passed it onto the British Legion in 1951.The name was changed to Crossfield House and it remained as a care home for ex-servicemen until 1985 when it closed due to dwindling numbers.