ADUPALS in downtown San Diego's Harborview district runs a vertically integrated ADU design-build operation from Kettner Boulevard, near the historic Santa Fe Depot. The firm's in-house drafting team produces permit-ready plan sets with structural calculations and Title 24 energy models, collaborating on complex lot configurations with architectural studios such as Studio E Architects in Bankers Hill. A formal feasibility study starts every project: site measurement, setback and height-limit verification, utility-capacity checks, fire-zone overlays, and coastal-zone compliance review establish what can be built before any design work begins. Finished ADU sites typically require grading, drainage, and hardscape integration, work often handled by landscape contractors such as Eternal Turf and Pavers to restore yard functionality after construction. The firm's most demanding builds involve multi-unit ADU developments on sloped or irregular lots requiring engineered retaining walls, seismic-resistant foundations, and dedicated sewer laterals with separate city meter connections.