Wayō (和様,lit. Japanese style?) is the name given to a style developed in art and architecture in Japan during the Heian period, mainly by the esoteric sects Tendai and Shingon. Together with Zenshūyō and Daibutsuyō, it is one of the three most significant styles developed by Japanese Buddhism on the basis of Chinese models.
The name was coined later, during the Kamakura period when the other two styles were born. Because by then the style was considered to be native, the term started to be used to distinguish older styles from those just arrived from China. It was characterized by simplicity, refraining from ornamentation, use of natural timber and in general plain materials. Structurally, it was distinguished by a main hall divided in two parts, an outer area for novices and an inner area for initiates, a hip-and-gable roof covering both areas, a raised wooden floor instead of the tile or stone floors of earlier temples, extended eaves to cover the front steps; shingles or bark rather than tile roofing; and a disposition of the shichidō garan adapting to the natural environment, rather than following the symmetrical layouts prevalent for example in Zen temples.
During the Heian period temples were built using only non-penetrating tie beams (nageshi(長押?)) made to fit around columns and pillars and nailed. The daibutsuyō style, first, and the zenshūyō style, later, replaced them with penetrating tie-beams (nuki(長押?)), which actually pierced the column, and were therefore much more effective against earthquakes. The nageshi was however retained as a purely decorative element.
Temples in this style, uninfluenced by the later styles, can be found mostly in the Kansai region, and particularly in Nara.