If ketayuki (distance spanned by the longitudinal purlins or plates of the main frame) is approximately 3.6 meters (two pillars), the structure is referred to as ikkensha Kasuga-zukuri style (shrines built to the width of just a single bay at the gable ends), and if ketayuki is approximately 5.5 meters (four pillars), the structure is referred to as sangensha Kasuga-zukuri style (shrines built to the width of three bays at the gable ends).
桁行（横に並んだ柱の間）が1間であれば（柱が2本）一間社春日造、3間であれば（柱が4本）三間社春日造という。