In 1823, Whitechurch National School was established in the grounds of the present church. In 1827, a new church (the present church), officially titled 'New Whitechurch', was consecrated, blessed and opened for public worship by Archbishop William Magee, Archbishop of Dublin. The church's architect was John Semple, the architect of several Dublin churches and also of the Round Room in the Mansion House, for the official visit of King George 4th to Ireland in 1824. The most notable features of Whitechurch - its slender graceful spire, the tall, thin lancet windows and very large internal thrust arches - are typical of Semple's work.

In succeeding years, a gallery (1834), a funeral door and chancel (1868) and a Vestry Room (1876) were added to the church.

In 1952 and in 1968, the parish undertook major repairs and extensive restoration works to the church.

The church's stained - glass window include three windows linked to bible incidents concerning angels. One of these windows is the work of Joshua Clarke, the father of Harry Clarke.

In 1990, due to considerable expansion, a new National School was blessed by Archbishop Donald Caird and officially opened by Mrs. Mary O'Rourke, Minister for Education, on a new site across the road from the church. The Old School was subsequently completely rebuilt and extended in 1999 and today serves as a very valued centre for parish and wider community activities and service. It was blessed by Archbishop Walton Empey, at its official opening by him.

There are two organs in the church, both dating from the later end of the nineteenth century. The original organ, a two manual, tracker - action Browne (Dublin) pipe organ, remains in place and in periodic use. In 1993, due to increasing liturgical demands, the two manual Connacher (Huddersfield) organ from the redundant St. Mary's Church, Ballinrobe, Co. Mayo, was transported, restored and re-built in Whitechurch, on a now extended gallery. A quite key figure in this whole project was the parish organist of the time, Stephen Adams, who is himself a noted organ - builder by profession.

In 2002/2003, a further major church restoration took place. The whole church was re-roofed, the gutters were replaced and pointing was replaced on the tower and spire. The bell headstock was also renewed.

Local publications produced by Whitechurch Parish include:

1. Behind the Scenes' (the story of the Whitechurch district in south county Dublin) by Ernest Shepherd (1983). It is now out of print, though it is available in some libraries, e.g. The Representative Church Body Library.
   
   
2. Old Schools (1823) 'Souvenir Brochure 1999', the story of Whitechurch Old Schools, 1823 - 1990 (copies still available at parish office).
   
   
3. People and Steeple' brochure (Whitechurch 175 years), Editor, Patrick Comerford (copies still available at parish office).