This study investigates the relationship between teaching efficacy and collaborative routines among public elementary school teachers in Calumpang District, particularly in the context of the K-12 curriculum implementation. The research addresses the challenges faced by educators who are traditionally oriented and may struggle to adapt to innovative teaching methods, thereby affecting their efficacy. A quantitative methodology was employed, utilizing surveys to gather data on teachers' demographic profiles, levels of teaching efficacy—focusing on classroom management, instructional strategies, and student engagement—and their participation in collaborative routines such as co-planning lessons and sharing best practices. Results indicate a significant positive correlation between teachers' engagement in collaborative routines and their perceived teaching efficacy. Teachers who actively participate in collaborative activities demonstrate enhanced self-efficacy, which is essential for effective instruction. The findings reveal that factors such as limited professional development opportunities and resistance to new pedagogical approaches contribute to low teaching efficacy. This study underscores the critical role of structured collaborative routines in fostering an environment conducive to professional growth and improved instructional practices. The implications of this research extend to educational administrators and policymakers, emphasizing the need for initiatives that promote collaboration among teachers. By enhancing collaborative practices, schools can significantly improve teaching efficacy, ultimately benefiting student learning outcomes. This study contributes to existing literature by providing localized insights into the dynamics of teacher collaboration and efficacy within the Philippine educational context. Future research should explore longitudinal impacts of sustained collaboration on teaching practices and student performance, further validating the role of professional development in enhancing educational effectiveness.