Converting workshop to ADU

Does anyone have contractor recommendations for converting a backyard workshop into an ADU? We would like to convert our seemingly quite structurally sound ~300 sq ft backyard workshop into a studio apartment-style guest house that our parents can stay in when they come to visit their grandchildren. As many of the ADU discussions we’ve seen here involve pre-fab units and/or permitting issues around new structures, we are hoping for advice for using this existing structure and recommendations for contractors to take it on. One major issue is that it’s on a slab foundation below grade, so I’d also love to hear anyone’s experience dealing with below grade foundation issues. Many thanks for any and all advice!

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