Living Labs are collaborative, real-world environments for co-creating sustainable innovations that rely on trust-based engagement with local communities. However, while many studies emphasise scaling up or out of such innovations, the potential for achieving qualitative transformations in relation to local values (“scaling deep”) remains underexplored. In response, we adopted a design ethnographic approach that blended immersive, reflexive ethnographic methods with the participatory co-design characteristics of Living Labs. This approach involved closely partnering with a local community champion through participant observation and co-creation workshops embedded in the community’s daily life. Our findings show that community champions acted as co-creators and mediators, building trust and aligning Living Lab activities with local values through a relational ethic of care. By immersing the research team in day-to-day community life via shared activities and open dialogue, champions enabled situated learning about local needs, thereby facilitating “scaling deep” through mutual trust and understanding. Overall, the study demonstrates that scaling deep in Living Labs hinges on embodied researcher–community partnerships in mutual care and shared responsibility. The study contributes to the Living Lab literature by illustrating how community champions can bridge understanding about sustainable transformations through relational engagement. © 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).