Adding a bathroom to an ADU or garage conversion? Check utilities first
ADU Planning
A bathroom addition looks simple on a floor plan, but on real Los Angeles and Orange County ADU and garage conversion jobs it often depends on what is under the slab, where the sewer line runs, and whether the electrical panel can support the added ventilation, lighting, GFCI protection, and water heating plan.
Before demo, confirm the proposed toilet location, drain slope, vent path, hot water source, exterior wall penetrations, and whether trenching or slab cutting is required. If the bathroom is part of an ADU, estate remodel, or rental-ready conversion, also check ceiling height, fire separation, egress, waterproofing, and the permit drawings before fixtures are ordered.
The practical sequence is utility walk, layout decision, permit scope, rough plumbing and electrical, inspection, waterproofing, then finishes. Energy Star Builders helps LA and OC homeowners plan ADU bathrooms, garage conversions, and estate remodels without guessing at hidden utility work. Request a consult at esbrenovations.com/adu or call (949) 763-3867.