San Diego ADU Specialists in Chula Vista's Third Avenue Village district focuses exclusively on accessory dwelling unit design, permitting, and construction across San Diego County. The firm's pre-construction service covers site feasibility analysis, zoning-code review under California Government Code Section 65852.2, and architectural drafting—a design-build pipeline that overlaps with ADU-focused firms like ADUs & Garage Conversions | Sprawl Design in the Chula Vista market. Project types span detached new-construction ADUs, attached additions, and garage conversions under the City of Chula Vista's streamlined 30-day pre-approved plan review. Full interior build-outs include kitchen rough-in, bathroom wet-wall plumbing, and electrical sub-panel installation. Sewer lateral connections and water-service upgrades for new ADUs require coordination with plumbing contractors such as Solid Plumbing & Drains Inc when the existing main line lacks capacity for the added fixture count. The most complex scope involves two-story detached ADUs requiring engineered foundation plans, moment-frame connections, and Title 24 energy-compliance documentation for structures approaching the 1,200-square-foot state maximum.