This study evaluates the efficiency and cost-effectiveness of an oncological outpatient neurosurgery (OON) protocol using Enhanced Recovery After Surgery (ERAS) principles in a European healthcare setting. Additionally, it assesses the impact of incorporating Hospital at Home (HaH) for perioperative follow-up on program efficiency and costs. We analyzed a case cohort of patients who underwent OON with HaH-based postoperative follow-up for tumor removal or biopsy at a tertiary care center since 2019. A control cohort treated under standard inpatient care was also examined. Costs associated with surgery and postoperative care were meticulously calculated for both groups. The case (n=17) and control (n=38) cohorts had comparable demographics and clinical profiles. Surgical costs, including operating room, anesthesia, and surgeon fees, were similar across groups. However, post-operative monitoring was significantly shorter for the outpatient cohort, leading to reduced observation costs (p<0.001). While the duration of follow-up care was similar, outpatient follow-up via HaH was more cost-effective, reducing overall surgery costs by approximately €2958 per patient (p<0.001) compared to inpatient care. No significant differences were observed in costs related to treatment, radiology, or lab tests between groups. Outpatient neurosurgery with HaH follow-up offers substantial cost savings without compromising care quality in a public health setting. Inpatient care's higher costs are largely due to bed utilization, while the integration of HaH does not add significant costs, making it a viable alternative for postoperative management.