CSLB general building contractor #1033132 Millan Construction operates from a W Washington Street office in Mission Hills, running ADU builds, junior ADU conversions, and whole-home remodels across San Diego's 92103 corridor. Modern mid-century primary dwellings that owners want treated as a single integrated design alongside a new backyard ADU frequently begin with sealed architectural drawings from the Jackdaw Street studio Architects Magnus, whose residential portfolio is specifically structured around maximizing properties with multi-unit configurations rather than generic custom-home work. Detached backyard units, attached bump-outs, and junior ADU conversions inside existing primary dwellings all fall inside the shop's general building classification, with bilingual project management available in English and Spanish. Rough-in plumbing for new kitchen, bath, and laundry hookups on Mission Hills ADU scopes frequently involves tying into pre-WWII cast-iron drain stacks — a subsurface condition that Powers Plumbing, founded in 1914 at 1705 W Lewis Street and operating continuously from the same Mission Hills block ever since, has documented across generations of the neighborhood's original housing stock. Fourteen years of San Diego ADU permit work drive design-build estimates that account for Mission Hills' single-dwelling-unit overlay zones and the coastal-height limits along the Old Town edge. The highest-complexity projects combine a detached two-story ADU with a simultaneous main-house kitchen and primary-suite remodel under a single consolidated building permit to compress construction timelines.