People often think hiring an ADU designer is just about getting a floor plan drawn. It is really about someone reading your lot before a single line is committed. Setbacks, height limits, lot coverage, parking exemptions, and utility locations all decide what you can build and where it can sit, and a backyard that looks open on paper may have a sewer line or a required separation from the main house that changes everything.
Expert ADU design services cover the whole path, from that first feasibility read through permit-ready construction documents, and they are organized around how a plan checker actually reviews a set. The value shows up most on the hard lots: sloped sites, tight setbacks, and older homes with unpermitted work already on them. If you are weighing an ADU, ask whoever you hire how they screen your parcel before they design, because that order is what separates a set that reaches permit from one that stalls in corrections for months.
