The neoclassical church was designed by the architects Gilles-Barnabé Guimard and Louis Montoyer and built from 1776 to 1787, replacing two neighbouring places of worship.

[5] The building lost somewhat of its typical neoclassical temple-like appearance by the addition, in the 19th century, of a dome and bell tower (after the design of the architect Tilman-François Suys), as well as a coloured fresco by the painter Jean Portaels on the pediment.

[1] The church's façade and portico, with its triangular pediment and its peristyle of six Corinthian columns, evoke the appearance of a Greco-Roman temple.

The primitive bas-relief of the pediment representing The Sacrifice of the Mass by Adrien Joseph Anrion, destroyed in 1797, was replaced in 1815 by The Eye of Conscience.

[7] The building's upper part comprises a chamfered attic with lateral slopes surmounted by a rectangular balustrade and an octagonal wooden bell tower.

This bell tower, painted in two shades of grey and enhanced with gold in 1987, is capped by a copper dome and a scrolled lantern bearing the cross (1849–1851).

[7] The interior, designed by Louis Montoyer in neoclassical style, is plain, sober and solemn, giving the place a very spacious and light impression.

High above the altar, in the apse, are bas-reliefs in stucco or painted blue stone depicting The Nativity, The Last Supper and The Entombment.

Above it hang memorial plaques of Prince Philippe, Count of Flanders and his wife, Princess Marie of Hohenzollern-Sigmaringen, the parents of the late King Albert I.