For accessory dwelling unit design and permitting in Carlsbad, Casita ADU operates from the Aviation Jet Complex at 2100 Palomar Airport Road in the Bressi Ranch corridor. The firm manages the full ADU development cycle — site feasibility analysis, architectural plan preparation, city permit submittal, and construction oversight — coordinating design documentation with architectural consultants including Houseometry. Carlsbad's ADU ordinance permits detached units up to 1,200 square feet on single-family lots, with Coastal Development Permits required for properties west of Interstate 5 under the California Coastal Act. Energy compliance on new ADU construction requires Title 24 Part 6 calculations, and many Carlsbad homeowners pair their ADU build with rooftop solar to offset increased electrical load — a scope that involves solar providers such as Powur. The most complex ADU projects involve two-story detached structures on sloped lots requiring engineered retaining walls, stepped foundations, and separate utility laterals for sewer, water, and 200-amp electrical service.