In 1914 the Rev Robert Johnstone, BD, became minister of the Parish Church. He saw the possibility of restoring the ruined church. The Misses Laurie of Starley generously funded the main work of restoration. In 1925, Mr William Williamson, FRIA, was appointed architect; Lyon Bros, the local joiners, were responsible for the beautiful roof. Suitable slating was procured from old buildings and the mason’s work was done by W & A Moyes of Aberdour. The floor was laid with stone flags from Cullullo Quarry and electric lighting installed. The paving round the church was laid by members of the congregation. Gifts were quickly forthcoming from individuals and families who had a close connection with the church – pulpit, chancel stalls, organ and stained glass windows. The font was discovered in the churchyard and placed on a new ‘stalk’. The children of the congregation contributed to a silver basin which was made on Iona and is brought out for the Sacrament of Holy Baptism. The cost of restoring the fabric, including the preparation of the ground, the removal of the Morton vault and the provision of the present oak doors, was £2,709; gifts from parishioners amounted to £1,300. The total cost was just over £4,000 (approximately £250,000 today). St Fillan’s Church was re-dedicated and re-opened for worship on 7th July 1926 by the Moderator of the General Assembly, the Right Rev. J.D. McCallum, DD. Amongst those present was Lt. Col. W. Glen Liston, CIE, great grandson of the Rev. Robert Liston, the minister in 1790. This was a great day for Dr. Johnstone whose vision and energy had driven the project through to completion. In 1949, a brass plaque commemorating Dr. Johnstone’s work and containing a record of all the known clergy pre and post Reformation was placed on the north wall of the chancel. At the Session Meeting in September 1926 it was agreed to ask Presbytery for consent to make the restored church of St Fillans, the ‘Parish Church’. Also it was agreed that, “the chairs should be ‘let’ to members and adherents and charged at one shilling a year for each ‘sitting’ (seat) and that a number offree seats should be left”. The Misses Laurie did not care for the limelight, and the only reference to their great generosity is a small brass plate below the sacramental window in the chancel. They were gifted ‘two sittings’ as a compliment from the kirk session.

The 850th Anniversary of the Church in 1973 was celebrated with new chairs. The roof was retiled in 2006.