Garage ADU in LA or OC? Check the panel, slab, and waterproofing before plans
ADU Planning
On Los Angeles and Orange County garage conversion ADUs, the first planning mistake is treating the garage like an empty room instead of a small dwelling with real utility demands. Before drawings are finalized, check the main panel size, available breaker space, subpanel location, sewer tie-in, water line path, slab condition, garage door infill, ceiling height, and whether any past unpermitted work needs to be corrected.
Moisture and waterproofing deserve attention before finishes are selected. Garages often have slab cracks, low thresholds, poor drainage at the driveway, old wall framing near concrete, and no insulation strategy. If the ADU will include a bathroom, kitchenette, laundry, or mini-split, those systems should be included in the permit scope early so electrical, plumbing, ventilation, and waterproofing inspections line up instead of colliding after demo.
The practical sequence is site walk, panel and load review, plumbing path, slab and drainage check, permit drawings, demo, rough utilities, inspection, waterproofing and insulation, then finishes. Energy Star Builders helps LA and OC homeowners plan garage ADUs with the construction details solved before the permit set gets expensive to revise. Request a consult at esbrenovations.com/remodels or call (949) 763-3867.