Thommanon is a single-towered temple with an east-facing central sanctuary, crowned by a prasat, or tower.
Access from the east is via a gopura, followed by a mandapa, or antechamber, before arriving at the central sanctuary.

The temple's carvings are very well preserved and the aged sandstone provides a distinct contrast to the surrounding jungle.
The architectural style of its tower is akin to the Angkor Wat temple and the Chau Say Tevoda in its vicinity.

Thommanon is better preserved than Chau Say Tevoda, though they are similar in design.
The reason for better preservation of Thommanon is attributed to the fact that its superstructure does not have stone-enclosed wood beams.
Thus, adoption of sandstone as the medium for carvings in this temple has made it more advanced in its architectural design vis-à-vis other temples in its vicinity, which were mostly wood-based.
All doorways include carved pediments.

The compound walls around the temple have all disappeared, leaving only the entry gates on the east and the west.
The central tower is all that remains of the main temple.
It is inferred that Thommanon and Chau Say Thavoda were interlinked to the central tower under one large compound with large gates.
The independent building separated from the main temple was the library.
Thommanon is a single-towered temple with an east-facing central sanctuary, crowned by a prasat, or tower. Access from the east is via a gopura, followed by a mandapa, or antechamber, before arriving at the central sanctuary.
The temple's carvings are very well preserved and the aged sandstone provides a distinct contrast to the surrounding jungle. The architectural style of its tower is akin to the Angkor Wat temple and the Chau Say Tevoda in its vicinity.
Thommanon is better preserved than Chau Say Tevoda, though they are similar in design. The reason for better preservation of Thommanon is attributed to the fact that its superstructure does not have stone-enclosed wood beams. Thus, adoption of sandstone as the medium for carvings in this temple has made it more advanced in its architectural design vis-à-vis other temples in its vicinity, which were mostly wood-based. All doorways include carved pediments.
The compound walls around the temple have all disappeared, leaving only the entry gates on the east and the west. The central tower is all that remains of the main temple. It is inferred that Thommanon and Chau Say Thavoda were interlinked to the central tower under one large compound with large gates. The independent building separated from the main temple was the library.
Thommanon