Wire arc additive manufacturing (WAAM) is popularly becoming an important and cost-effective manufacturing process to fabricate medium-large size components. The process provides the ability to build a near-net-shape structure with a high production rate (50–130 gm/min) and high material usage efficiency (80–90%). However, as per other additive manufacturing (AM) processes, process planning and optimization provide a uniform, time-efficient, and defect-free deposition. Therefore, this study focuses on the parametric study and process optimization to fabricate multi-layers wall components. The most commonly and widely used SS304 stainless steel metallic wire has been used to fabricate four-layered wall structures using multi-layer bead deposition. Open circuit voltage (OCV); wire feed speed (WFR) and shielding gas flow rate (SGFR) has been selected as the input process parameters and the bead height to width ratio (H/W) selected as the output parameter. The nine experiments were performed using the L9 orthogonal array based on the Taguchi method and then implemented the analysis of variance (ANOVA) to describe various properties. The resultant data has been analyzed and studied using Minitab-17 software. The results obtained showed that the optimum condition for the H/W ratio is 24 V OCV, 14 m/min WFR, and 10Lit/min SGFR. The order of process parameters influencing the H/W ratio is OCV, WFR, and SGFR. These results were validated by conducting confirmation experiments and found satisfactory.