Achalasia is a neurodegenerative disorder affecting esophageal sphincter function. Treatment options include non-surgical and surgical approaches, such as Heller myotomy (HM). Combining Dor fundoplication with HM is controversial but may prevent gastroesophageal reflux disease (GERD). This retrospective cohort study aimed to assess whether HM with Dor fundoplication reduces GERD rates and increases dysphagia rates. Eighty patients who underwent HM between January 2018 and August 2023 were included. Sixty-four patients had Dor fundoplication and were matched 4:1 to 16 patients without fundoplication. Records were reviewed for GERD and achalasia symptoms at various postoperative time points. No significant differences in GERD or dysphagia symptoms were found between the two groups at any time point. Similarly, there were no significant differences in chest pain or dysphagia treatment. In conclusion, this study suggests that the addition of Dor fundoplication to HM does not significantly impact postoperative GERD or achalasia-related symptoms.