With the arrival of bishops, priests and laity from revolutionary France, Catholic chapels were set up in St. Helier to meet their spiritual needs.

[citation needed] The consecration took place on 5 September 1893, to commemorate the centenary of the re-establishment of the Catholic Church in the Channel Isles, in 1793, when the bill of tolerance was handed over to Mathieu de Gruchy, a Jerseyman and a convert who became a priest in the French diocese of Luçon before the Revolution.

The church was adapted for the new liturgy in 1984 and was beautifully restored in 2006/2007 under the direction of Monsignor Nicholas France, Catholic Dean in Jersey.

[citation needed] St. Thomas's Church is constructed in the thirteenth-century style and comprises nave, aisles, transepts with chapels forming the arms of the Cross, and a chancel.

On each side of the tower are two other chapels with groined vaults, that at the south end having a deep recess in the centre of which stands the baptismal font.

At the apsis of the chancel and in corbel on a low granite shaft with moulded base and sculptured capital is a richly framed niche, occupying the centre arch of an arcade with a bud ornament.

[citation needed] All the groined roof is made of hollow bricks covered with plaster, having the appearance of stone, that of the nave, of the chancel, of the transepts and of the chapels forming the arms of the Cross is ornamented with moulded arches with sculptured keystones.

The portal, with a tympanum representing the Apparition of our Lord, after His Resurrection, to St. Thomas the Apostle, and signed Louis Dupont, is surmounted by a three-light window with mullions and a tracery rose, in blue granite of Brittany.

[citation needed] This vast gallery, extending over the porch and projecting into the nave, is supported by a three arched vault with mouldings at the groins.

On the other side of the church, another refurbished building houses Catholic Pastoral Services, the Welcome Centre and the office of the Society of St. Vincent de Paul.