| Sumario: | Background: Violence against children poses short‐ and long‐term risks to health, society and economy. The Parenting for Lifelong Health for Young Children (PLH‐YC) programme has been shown to be effective in reducing child maltreatment for 2‐ to 9‐year‐old children in Thailand. We assessed the costs and budget requirements across multiple scenarios for scaling up the PLH‐YC programme in Thailand. Methods: Five scaling‐up scenarios at varying levels were identified through a consultative workshop and semistructured interviews, with implementation planned via existing infrastructures. A bottom‐up costing approach was employed to estimate the cost and budget impact using data collected through document review, website search and interviews. Costing was performed using the provider's and societal perspectives. Results: The cost per caregiver based on the societal perspective ranged from 262 to 300 USD (1 USD = 35.36 THB in 2024). From the provider's perspective, the cost per caregiver trained was estimated at 82–195 USD. Assuming nationwide programme implementation, the estimated total budget impact for 1 year ranged from 50 to 76 million USD. Conclusions: Scaling‐up PLH‐YC incurs different unit costs per caregiver depending on the levels of programme delivery. However, budget requirements for all scenarios can be prohibitively high. To increase financial feasibility, programme modifications while maintaining quality, such as fewer parenting sessions or hybrid implementation, should be explored. Strong political commitment and financial support by key stakeholders are necessary for programme adoption and scaling up. Summary: Thailand's Parenting for Lifelong Health for Young Children (PLH‐YC) programme have been shown to be effective in reducing child maltreatment among children ages 2–9.In our research, five potential scaling‐up scenarios were designed at varying levels of implementation within Thailand, by collaborating with the existing systems.The unit cost of five scaling‐up scenarios is comparable to other parenting programmes with cost per caregiver approximated between $262–300 (societal perspective) and between $82‐$195 (provider perspective).The estimated budget impact for nationwide delivery could be seen as prohibitively high, ranging from $50 million to $76 million.Strong political commitment and financial support by key stakeholders are required for programme adoption and scaling up.
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