The church has a basilical ground plan and five naves, the central one rising to a height of 45 m and the side ones to 29 m. The central nave and side naves are supported by a system of columns which is completely new in the history of architecture. In the eyes of the observer, the interior looks like a forest of trees with beautiful alignments, of which we can see the trunk, the branches and a cluster of leaves. In this forest of columns, the light filtered through the windows will give a bucolic appearance and give a feeling of undergrowth.
The ceilings of the central nave, seen from the interior, will be crowned by aedicules that will provide support for lights with the initials of the Holy Family. Five thick parabolic shields, placed on either side, will have "Amen" and the words of praise "Al", "le", "lu", "ia", broken up into syllables, written on them. The large columns that support the vaults and the roofs also represent the apostles and the churches of the whole world. The columns dedicated to the apostles St Peter and St Paul are outstanding; they are situated between the crossing and the apse, joining the triumphal arch with the Calvary.
On the exterior, the water from the roofs runs down drainpipes which at half height are fixed to the walls at half height with the following allegories and captions: a flask with the inscription "myrra (myrrh)- sacrifice", an incense burner with the inscription "thur (incense) – prayer" and a box with the inscription "aurum (gold)- alms. Beside and on the windows are images of the saints who founded religious orders, such as St John Bosco, St Joachim Vedruna or St Joseph Oriol.