Community health centres (CHCs) play a crucial role in delivering healthcare services to underserved populations in Tanzania. A randomized controlled trial was conducted with 100 CHCs, randomly assigned to either intervention or control groups. Data were collected over two years using standardised health records and cost accounting methods. The analysis revealed that the intervention group saw a significant reduction in average treatment costs per patient by 25% compared to controls (p < 0.01), with a 95% confidence interval of -34% to -16%. CHCs provide an efficient and cost-effective model for delivering healthcare services, particularly in resource-constrained settings. Further implementation should focus on scaling up successful models and integrating CHCs into existing health systems. Community Health Centres, Cost-Effectiveness Analysis, Randomized Field Trial, Healthcare Delivery Systems Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.