San Diego Granny Flat ADU Builders Construction in Chula Vista builds detached and attached accessory dwelling units, garage conversions, and custom homes from its Paseo Magda office in the 91910 area. The design-build workflow integrates architectural drafting with construction management, a vertically integrated approach that parallels the design services of firms like Luis Davalos Design in the Chula Vista ADU market. California's ADU statute under Government Code 65852.2 permits units up to 1,200 square feet on single-family lots, and the company navigates Chula Vista's development-impact-fee waivers that reduce upfront costs for homeowners. Kitchen and bathroom build-outs within each ADU require independent plumbing stacks, and sewer-lateral tie-ins to the municipal main are coordinated with plumbing specialists such as Primo Plumbing for backflow-preventer installation and flow testing. Title 24 energy compliance drives insulation specs, window U-factor selections, and HERS testing on every permitted unit. The most complex builds involve ground-up two-bedroom detached ADUs with separate 100-amp electrical sub-panels, tankless water heaters, and mini-split HVAC systems requiring SEER-15-minimum equipment under current California Energy Code.