Congregationalism emphasises autonomy, participatory governance, and community involvement, potentially influencing church growth. This study explores the relationship between congregationalism and church growth, examining the opportunities and challenges that arise when Congregationalist principles are implemented in local churches. This research analyses Congregationalist theory and church growth research through a mixed-method approach, combining systematic case study and survey. It was found from the study as opportunities that congregationalism fosters ownership and commitment; congregational autonomy encourages creative outreach. In addition, among other challenges, it was discovered that congregational processes can be slow, and balancing individual freedom with collective vision is quite tricky. In conclusion, congregationalism offers opportunities for church growth through empowered membership, contextual relevance, and innovative ministry. However, challenges arise from leadership tensions and resource constraints. Leadership development, participatory decision making, strategic planning, evaluation, collaboration and partnership are recommendations raised in this work.