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Background: Transitioning from hospital to home presents significant challenges, particularly for patients aged 75 and above. The 'Your Care Needs You' (YCNY) intervention, evaluated through a cluster randomised controlled trial (cRCT), aims to empower these patients by providing essential information and skills to prepare them for being at home. This study evaluates the cost-effectiveness of the YCNY intervention compared to standard care within the UK National Health Service (NHS) over the trial's duration (90 days post-discharge). Methods: The economic evaluation utilised individual patient-level data from the YCNY cRCT. The analysis was conducted from the perspective of the NHS and Personal Social Services. The analysis calculated the adjusted mean differences in costs and Quality-Adjusted Life Years (QALYs) between the YCNY intervention and control groups. In our base case, Multilevel Mixed-Effects Generalised Linear Models (MME-GLM) were employed to account for the hierarchical data structure. Additional alternative scenarios and a probabilistic sensitivity analysis were conducted to assess the robustness of the findings. Results: The base case results indicated the YCNY intervention reduced costs ({\pounds}269) and improved outcomes (QALY gain of 0.0057). The net health benefit (NHB) of the YCNY intervention using a cost-effectiveness threshold of {\pounds}15.000/QALY was 0.0246. These findings suggest the YCNY intervention dominates usual care, with a high probability (89%) of the YCNY intervention being cost-effective at a {\pounds}15,000 per QALY threshold. The results remained robust across several alternative scenario analyses. Discussion: The YCNY intervention could represent a promising and potentially cost-effective approach for enhancing the safety and experience of older adults transitioning from hospital to home in the UK.