The most significant addition to the group of buildings that surround the church was the construction in 1829 of a chapel attached to a wing of Hartpury Court. It was built for the Dominican nuns who fled to Hartpury during the French revolution. Account books for the period show that Robert Canning, the Lord of the Manor, erected the shell of the building and the nuns were then responsible for the internal fittings. A small cottage consisting of two rooms on the ground floor and two above, was built adjoining the chapel. The ground floor room to the north had a connecting door to the Chapel and was probably used as a vestry. The two rooms on the first floor were no doubt occupied by the nuns' priest.
When the nuns left, the Court was let to tenant farmers. The Chapel was attached to the Gloucester Mission and Mass was celebrated once a month on a Sunday and at the major festivals. By 1883 Hartpury Court, the Abbot's old manor house had been demolished and a replacement farmhouse built, leaving the Chapel quite detached. Services became very irregular and its condition deteriorated.
In 1934 the Chapel was refurbished. The lavish arrangements are shown in the two photographs taken when the Chapel was rededicated to St. Dominic by Fr. Bernard Delaney, O.P., Prior Provincial, on 1st January 1936. Gloucester priests were responsible for three masses in the Chapel each week on Sunday, Tuesday and Friday.
Exactly 100 years (September 1939) after the departure of the Dominicanesses, a community of nuns again found refuge in Hartpury, having been evacuated from their convent in Holloway, London, owing to the outbreak of World War II.


The Chapel ceased to be used for services in 1947 and in 1952 was sold for £150 to be used as a chicken deep-litter shed.