The ancient ordination hall of Wat Chaeng is a rare example of "Maha-Ud" architecture, characterized by having only one entrance and no windows. This compact brick-and-mortar structure reflects a specific design style popular from the late Ayutthaya to early Rattanakosin periods. Beyond providing a secluded space for meditation, these single-door halls are traditionally believed to be spiritually powerful sites for consecrating amulets, specifically for enhancing invincibility and protection.